673 lines
20 KiB
TypeScript
673 lines
20 KiB
TypeScript
import { describe, it, expect } from "bun:test"
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import {
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decideSpawnActions,
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calculateCapacity,
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canSplitPane,
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canSplitPaneAnyDirection,
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getBestSplitDirection,
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findSpawnTarget,
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type SessionMapping
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} from "./decision-engine"
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import type { WindowState, CapacityConfig, TmuxPaneInfo } from "./types"
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import { MIN_PANE_WIDTH, MIN_PANE_HEIGHT } from "./types"
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const MIN_SPLIT_WIDTH = 2 * MIN_PANE_WIDTH + 1
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const MIN_SPLIT_HEIGHT = 2 * MIN_PANE_HEIGHT + 1
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describe("canSplitPane", () => {
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const createPane = (width: number, height: number): TmuxPaneInfo => ({
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paneId: "%1",
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width,
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height,
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left: 100,
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top: 0,
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title: "test",
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isActive: false,
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})
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it("returns true for horizontal split when width >= 2*MIN+1", () => {
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// given - pane with exactly minimum splittable width (107)
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const pane = createPane(MIN_SPLIT_WIDTH, 20)
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// when
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const result = canSplitPane(pane, "-h")
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// then
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expect(result).toBe(true)
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})
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it("returns false for horizontal split when width < 2*MIN+1", () => {
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// given - pane just below minimum splittable width
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const pane = createPane(MIN_SPLIT_WIDTH - 1, 20)
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// when
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const result = canSplitPane(pane, "-h")
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// then
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expect(result).toBe(false)
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})
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it("returns true for vertical split when height >= 2*MIN+1", () => {
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// given - pane with exactly minimum splittable height (23)
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const pane = createPane(50, MIN_SPLIT_HEIGHT)
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// when
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const result = canSplitPane(pane, "-v")
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// then
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expect(result).toBe(true)
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})
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it("returns false for vertical split when height < 2*MIN+1", () => {
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// given - pane just below minimum splittable height
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const pane = createPane(50, MIN_SPLIT_HEIGHT - 1)
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// when
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const result = canSplitPane(pane, "-v")
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// then
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expect(result).toBe(false)
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})
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})
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describe("canSplitPaneAnyDirection", () => {
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const createPane = (width: number, height: number): TmuxPaneInfo => ({
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paneId: "%1",
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width,
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height,
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left: 100,
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top: 0,
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title: "test",
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isActive: false,
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})
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it("returns true when can split horizontally but not vertically", () => {
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// given
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const pane = createPane(MIN_SPLIT_WIDTH, MIN_SPLIT_HEIGHT - 1)
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// when
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const result = canSplitPaneAnyDirection(pane)
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// then
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expect(result).toBe(true)
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})
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it("returns true when can split vertically but not horizontally", () => {
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// given
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const pane = createPane(MIN_SPLIT_WIDTH - 1, MIN_SPLIT_HEIGHT)
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// when
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const result = canSplitPaneAnyDirection(pane)
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// then
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expect(result).toBe(true)
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})
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it("returns false when cannot split in any direction", () => {
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// given - pane too small in both dimensions
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const pane = createPane(MIN_SPLIT_WIDTH - 1, MIN_SPLIT_HEIGHT - 1)
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// when
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const result = canSplitPaneAnyDirection(pane)
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// then
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expect(result).toBe(false)
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})
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it("#given custom minPaneWidth #when pane fits smaller width #then returns true", () => {
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//#given - pane too small for default MIN_PANE_WIDTH(52) but fits custom 30
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const customMin = 30
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const customMinSplitW = 2 * customMin + 1
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const pane = createPane(customMinSplitW, MIN_SPLIT_HEIGHT - 1)
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//#when
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const defaultResult = canSplitPaneAnyDirection(pane)
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const customResult = canSplitPaneAnyDirection(pane, customMin)
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//#then
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expect(defaultResult).toBe(false)
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expect(customResult).toBe(true)
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})
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})
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describe("getBestSplitDirection", () => {
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const createPane = (width: number, height: number): TmuxPaneInfo => ({
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paneId: "%1",
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width,
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height,
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left: 100,
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top: 0,
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title: "test",
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isActive: false,
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})
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it("returns -h when only horizontal split possible", () => {
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// given
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const pane = createPane(MIN_SPLIT_WIDTH, MIN_SPLIT_HEIGHT - 1)
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// when
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const result = getBestSplitDirection(pane)
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// then
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expect(result).toBe("-h")
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})
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it("returns -v when only vertical split possible", () => {
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// given
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const pane = createPane(MIN_SPLIT_WIDTH - 1, MIN_SPLIT_HEIGHT)
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// when
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const result = getBestSplitDirection(pane)
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// then
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expect(result).toBe("-v")
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})
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it("returns null when no split possible", () => {
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// given
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const pane = createPane(MIN_SPLIT_WIDTH - 1, MIN_SPLIT_HEIGHT - 1)
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// when
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const result = getBestSplitDirection(pane)
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// then
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expect(result).toBe(null)
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})
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it("returns -h when width >= height and both splits possible", () => {
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// given - wider than tall
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const pane = createPane(MIN_SPLIT_WIDTH + 10, MIN_SPLIT_HEIGHT)
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// when
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const result = getBestSplitDirection(pane)
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// then
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expect(result).toBe("-h")
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})
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it("returns -v when height > width and both splits possible", () => {
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// given - taller than wide (height needs to be > width for -v)
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const pane = createPane(MIN_SPLIT_WIDTH, MIN_SPLIT_WIDTH + 10)
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// when
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const result = getBestSplitDirection(pane)
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// then
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expect(result).toBe("-v")
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})
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it("#given custom minPaneWidth #when pane width below default but above custom #then returns -h", () => {
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//#given
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const customMin = 30
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const customMinSplitW = 2 * customMin + 1
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const pane = createPane(customMinSplitW, MIN_SPLIT_HEIGHT - 1)
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//#when
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const defaultResult = getBestSplitDirection(pane)
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const customResult = getBestSplitDirection(pane, customMin)
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//#then
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expect(defaultResult).toBe(null)
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expect(customResult).toBe("-h")
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})
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})
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describe("decideSpawnActions", () => {
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const defaultConfig: CapacityConfig = {
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mainPaneMinWidth: 120,
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agentPaneWidth: 40,
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}
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const createWindowState = (
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windowWidth: number,
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windowHeight: number,
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agentPanes: Array<{ paneId: string; width: number; height: number; left: number; top: number }> = []
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): WindowState => ({
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windowWidth,
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windowHeight,
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mainPane: { paneId: "%0", width: Math.floor(windowWidth / 2), height: windowHeight, left: 0, top: 0, title: "main", isActive: true },
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agentPanes: agentPanes.map((p, i) => ({
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...p,
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title: `agent-${i}`,
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isActive: false,
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})),
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})
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describe("minimum size enforcement", () => {
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it("returns canSpawn=false when window too small", () => {
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// given - window smaller than minimum pane size
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const state = createWindowState(50, 5)
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// when
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const result = decideSpawnActions(state, "ses1", "test", defaultConfig, [])
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// then
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expect(result.canSpawn).toBe(false)
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expect(result.reason).toContain("too small")
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})
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it("returns canSpawn=true when main pane can be split", () => {
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// given - main pane width >= 2*MIN_PANE_WIDTH+1 = 107
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const state = createWindowState(220, 44)
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// when
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const result = decideSpawnActions(state, "ses1", "test", defaultConfig, [])
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// then
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expect(result.canSpawn).toBe(true)
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expect(result.actions.length).toBe(1)
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expect(result.actions[0].type).toBe("spawn")
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})
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it("respects configured agent min width for split decisions", () => {
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// given
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const state = createWindowState(240, 44, [
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{ paneId: "%1", width: 100, height: 44, left: 140, top: 0 },
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])
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const mappings: SessionMapping[] = [
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{ sessionId: "old-ses", paneId: "%1", createdAt: new Date("2024-01-01") },
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]
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const strictConfig: CapacityConfig = {
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mainPaneSize: 60,
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mainPaneMinWidth: 120,
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agentPaneWidth: 60,
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}
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// when
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const result = decideSpawnActions(state, "ses1", "test", strictConfig, mappings)
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// then
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expect(result.canSpawn).toBe(false)
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expect(result.actions).toHaveLength(0)
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expect(result.reason).toContain("defer")
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})
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it("returns canSpawn=true when 0 agent panes exist and mainPane occupies full window width", () => {
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// given - tmux reports mainPane.width === windowWidth when no splits exist
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const windowWidth = 252
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const windowHeight = 56
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const state: WindowState = {
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windowWidth,
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windowHeight,
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mainPane: { paneId: "%0", width: windowWidth, height: windowHeight, left: 0, top: 0, title: "main", isActive: true },
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agentPanes: [],
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}
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// when
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const result = decideSpawnActions(state, "ses1", "test", defaultConfig, [])
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// then - should NOT be blocked by agentAreaWidth check
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expect(result.canSpawn).toBe(true)
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expect(result.actions.length).toBe(1)
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expect(result.actions[0].type).toBe("spawn")
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})
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it("returns canSpawn=false when 0 agent panes and window genuinely too narrow to split", () => {
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// given - window so narrow that even splitting mainPane would fail
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const windowWidth = 70
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const windowHeight = 56
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const state: WindowState = {
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windowWidth,
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windowHeight,
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mainPane: { paneId: "%0", width: windowWidth, height: windowHeight, left: 0, top: 0, title: "main", isActive: true },
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agentPanes: [],
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}
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// when
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const result = decideSpawnActions(state, "ses1", "test", defaultConfig, [])
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// then
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expect(result.canSpawn).toBe(false)
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expect(result.reason).toContain("too small")
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})
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it("returns canSpawn=false when agent panes exist but agent area too small", () => {
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// given - 1 agent pane exists, and agent area is below minPaneWidth
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const state: WindowState = {
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windowWidth: 180,
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windowHeight: 44,
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mainPane: { paneId: "%0", width: 160, height: 44, left: 0, top: 0, title: "main", isActive: true },
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agentPanes: [{ paneId: "%1", width: 19, height: 44, left: 161, top: 0, title: "agent-0", isActive: false }],
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}
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// when
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const result = decideSpawnActions(state, "ses1", "test", defaultConfig, [])
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// then
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expect(result.canSpawn).toBe(false)
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expect(result.reason).toContain("defer attach")
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})
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it("spawns at exact minimum splittable width with 0 agent panes", () => {
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// given
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const exactThreshold = 2 * defaultConfig.agentPaneWidth + 1
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const state: WindowState = {
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windowWidth: exactThreshold,
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windowHeight: 56,
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mainPane: { paneId: "%0", width: exactThreshold, height: 56, left: 0, top: 0, title: "main", isActive: true },
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agentPanes: [],
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}
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// when
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const result = decideSpawnActions(state, "ses1", "test", defaultConfig, [])
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// then
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expect(result.canSpawn).toBe(true)
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})
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it("rejects spawn 1 pixel below minimum splittable width with 0 agent panes", () => {
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// given
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const belowThreshold = 2 * defaultConfig.agentPaneWidth
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const state: WindowState = {
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windowWidth: belowThreshold,
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windowHeight: 56,
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mainPane: { paneId: "%0", width: belowThreshold, height: 56, left: 0, top: 0, title: "main", isActive: true },
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agentPanes: [],
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}
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// when
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const result = decideSpawnActions(state, "ses1", "test", defaultConfig, [])
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// then
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expect(result.canSpawn).toBe(false)
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})
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it("closes oldest pane when existing panes are too small to split", () => {
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// given - existing pane is below minimum splittable size
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const state = createWindowState(220, 30, [
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{ paneId: "%1", width: 50, height: 15, left: 110, top: 0 },
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])
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const mappings: SessionMapping[] = [
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{ sessionId: "old-ses", paneId: "%1", createdAt: new Date("2024-01-01") },
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]
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// when
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const result = decideSpawnActions(state, "ses1", "test", defaultConfig, mappings)
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// then
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expect(result.canSpawn).toBe(true)
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expect(result.actions.length).toBe(2)
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expect(result.actions[0].type).toBe("close")
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expect(result.actions[1].type).toBe("spawn")
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})
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it("can spawn when existing pane is large enough to split", () => {
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// given - existing pane is above minimum splittable size
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const state = createWindowState(320, 50, [
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{ paneId: "%1", width: MIN_SPLIT_WIDTH + 10, height: MIN_SPLIT_HEIGHT + 10, left: 160, top: 0 },
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])
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// when
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const result = decideSpawnActions(state, "ses1", "test", defaultConfig, [])
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// then
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expect(result.canSpawn).toBe(true)
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expect(result.actions.length).toBe(1)
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expect(result.actions[0].type).toBe("spawn")
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})
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})
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describe("basic spawn decisions", () => {
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it("returns canSpawn=true when capacity allows new pane", () => {
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// given - 220x44 window, mainPane width=110 >= MIN_SPLIT_WIDTH(107)
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const state = createWindowState(220, 44)
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// when
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const result = decideSpawnActions(state, "ses1", "test", defaultConfig, [])
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// then
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expect(result.canSpawn).toBe(true)
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expect(result.actions.length).toBe(1)
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expect(result.actions[0].type).toBe("spawn")
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})
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it("spawns with splitDirection", () => {
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// given
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const state = createWindowState(212, 44, [
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{ paneId: "%1", width: MIN_SPLIT_WIDTH, height: MIN_SPLIT_HEIGHT, left: 106, top: 0 },
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])
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// when
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const result = decideSpawnActions(state, "ses1", "test", defaultConfig, [])
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// then
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expect(result.canSpawn).toBe(true)
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expect(result.actions[0].type).toBe("spawn")
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if (result.actions[0].type === "spawn") {
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expect(result.actions[0].sessionId).toBe("ses1")
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expect(result.actions[0].splitDirection).toBeDefined()
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}
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})
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it("returns canSpawn=false when no main pane", () => {
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// given
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const state: WindowState = { windowWidth: 212, windowHeight: 44, mainPane: null, agentPanes: [] }
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// when
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const result = decideSpawnActions(state, "ses1", "test", defaultConfig, [])
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// then
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expect(result.canSpawn).toBe(false)
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expect(result.reason).toBe("no main pane found")
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})
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it("uses configured main pane size for split/defer decision", () => {
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// given
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const state = createWindowState(240, 44, [
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{ paneId: "%1", width: 90, height: 44, left: 150, top: 0 },
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])
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const mappings: SessionMapping[] = [
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{ sessionId: "old-ses", paneId: "%1", createdAt: new Date("2024-01-01") },
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]
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const wideMainConfig: CapacityConfig = {
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mainPaneSize: 80,
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mainPaneMinWidth: 120,
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agentPaneWidth: 40,
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}
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// when
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const result = decideSpawnActions(state, "ses1", "test", wideMainConfig, mappings)
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// then
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expect(result.canSpawn).toBe(false)
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expect(result.actions).toHaveLength(0)
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expect(result.reason).toContain("defer")
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})
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})
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})
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describe("findSpawnTarget", () => {
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it("uses deterministic vertical fallback order", () => {
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// given
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const state: WindowState = {
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windowWidth: 320,
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windowHeight: 44,
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mainPane: {
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paneId: "%0",
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width: 160,
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height: 44,
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left: 0,
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top: 0,
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title: "main",
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isActive: true,
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},
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agentPanes: [
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{ paneId: "%1", width: 70, height: 20, left: 170, top: 0, title: "a", isActive: false },
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{ paneId: "%2", width: 120, height: 44, left: 240, top: 0, title: "b", isActive: false },
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{ paneId: "%3", width: 120, height: 22, left: 240, top: 22, title: "c", isActive: false },
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],
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}
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const config: CapacityConfig = {
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mainPaneSize: 50,
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mainPaneMinWidth: 120,
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agentPaneWidth: 40,
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}
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// when
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const target = findSpawnTarget(state, config)
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// then
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expect(target).toEqual({ targetPaneId: "%2", splitDirection: "-v" })
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})
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})
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describe("calculateCapacity", () => {
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it("calculates 2D grid capacity (cols x rows)", () => {
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// given - 212x44 window (user's actual screen)
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// when
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const capacity = calculateCapacity(212, 44)
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// then - availableWidth=106, cols=(106+1)/(52+1)=2, rows=(44+1)/(11+1)=3 (accounting for dividers)
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expect(capacity.cols).toBe(2)
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expect(capacity.rows).toBe(3)
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expect(capacity.total).toBe(6)
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})
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it("returns 0 cols when agent area too narrow", () => {
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// given - window too narrow for even 1 agent pane
|
|
// when
|
|
const capacity = calculateCapacity(100, 44)
|
|
|
|
// then - availableWidth=50, cols=50/53=0
|
|
expect(capacity.cols).toBe(0)
|
|
expect(capacity.total).toBe(0)
|
|
})
|
|
|
|
it("returns 0 rows when window too short", () => {
|
|
// given - window too short
|
|
// when
|
|
const capacity = calculateCapacity(212, 10)
|
|
|
|
// then - rows=10/11=0
|
|
expect(capacity.rows).toBe(0)
|
|
expect(capacity.total).toBe(0)
|
|
})
|
|
|
|
it("scales with larger screens but caps at MAX_GRID_SIZE=4", () => {
|
|
// given - larger 4K-like screen (400x100)
|
|
// when
|
|
const capacity = calculateCapacity(400, 100)
|
|
|
|
// then - cols capped at 4, rows capped at 4 (MAX_GRID_SIZE)
|
|
expect(capacity.cols).toBe(3)
|
|
expect(capacity.rows).toBe(4)
|
|
expect(capacity.total).toBe(12)
|
|
})
|
|
|
|
it("#given a smaller minPaneWidth #when calculating capacity #then fits more columns", () => {
|
|
//#given
|
|
const smallMinWidth = 30
|
|
|
|
//#when
|
|
const defaultCapacity = calculateCapacity(212, 44)
|
|
const customCapacity = calculateCapacity(212, 44, smallMinWidth)
|
|
|
|
//#then
|
|
expect(customCapacity.cols).toBeGreaterThanOrEqual(defaultCapacity.cols)
|
|
})
|
|
|
|
it("#given non-50 main pane width #when calculating capacity #then uses real agent area width", () => {
|
|
//#given
|
|
const windowWidth = 220
|
|
const windowHeight = 44
|
|
const mainPaneWidth = 132
|
|
|
|
//#when
|
|
const capacity = calculateCapacity(windowWidth, windowHeight, 52, mainPaneWidth)
|
|
|
|
//#then
|
|
expect(capacity.cols).toBe(1)
|
|
expect(capacity.total).toBe(3)
|
|
})
|
|
})
|
|
|
|
describe("decideSpawnActions with custom agentPaneWidth", () => {
|
|
const createWindowState = (
|
|
windowWidth: number,
|
|
windowHeight: number,
|
|
agentPanes: Array<{ paneId: string; width: number; height: number; left: number; top: number }> = []
|
|
): WindowState => ({
|
|
windowWidth,
|
|
windowHeight,
|
|
mainPane: { paneId: "%0", width: Math.floor(windowWidth / 2), height: windowHeight, left: 0, top: 0, title: "main", isActive: true },
|
|
agentPanes: agentPanes.map((p, i) => ({
|
|
...p,
|
|
title: `agent-${i}`,
|
|
isActive: false,
|
|
})),
|
|
})
|
|
|
|
it("#given a smaller agentPaneWidth #when window would be too small for default #then spawns with custom config", () => {
|
|
//#given
|
|
const smallConfig: CapacityConfig = { mainPaneMinWidth: 120, agentPaneWidth: 25 }
|
|
const state = createWindowState(100, 30)
|
|
|
|
//#when
|
|
const defaultResult = decideSpawnActions(state, "ses1", "test", { mainPaneMinWidth: 120, agentPaneWidth: 52 }, [])
|
|
const customResult = decideSpawnActions(state, "ses1", "test", smallConfig, [])
|
|
|
|
//#then
|
|
expect(defaultResult.canSpawn).toBe(false)
|
|
expect(customResult.canSpawn).toBe(true)
|
|
})
|
|
|
|
it("#given custom agentPaneWidth and splittable existing pane #when deciding spawn #then uses spawn without eviction", () => {
|
|
//#given
|
|
const customConfig: CapacityConfig = { mainPaneMinWidth: 120, agentPaneWidth: 40 }
|
|
const state = createWindowState(220, 44, [
|
|
{ paneId: "%1", width: 90, height: 30, left: 110, top: 0 },
|
|
])
|
|
const mappings: SessionMapping[] = [
|
|
{ sessionId: "old-ses", paneId: "%1", createdAt: new Date("2024-01-01") },
|
|
]
|
|
|
|
//#when
|
|
const result = decideSpawnActions(state, "ses1", "test", customConfig, mappings)
|
|
|
|
//#then
|
|
expect(result.canSpawn).toBe(true)
|
|
expect(result.actions.length).toBe(1)
|
|
expect(result.actions[0].type).toBe("spawn")
|
|
if (result.actions[0].type === "spawn") {
|
|
expect(result.actions[0].targetPaneId).toBe("%1")
|
|
expect(result.actions[0].splitDirection).toBe("-h")
|
|
}
|
|
})
|
|
|
|
it("#given wider main pane #when capacity needs two evictions #then defer is chosen", () => {
|
|
//#given
|
|
const config: CapacityConfig = { mainPaneMinWidth: 120, agentPaneWidth: 40 }
|
|
const state = createWindowState(220, 44, [
|
|
{ paneId: "%1", width: 43, height: 44, left: 133, top: 0 },
|
|
{ paneId: "%2", width: 43, height: 44, left: 177, top: 0 },
|
|
{ paneId: "%3", width: 43, height: 21, left: 133, top: 22 },
|
|
{ paneId: "%4", width: 43, height: 21, left: 177, top: 22 },
|
|
{ paneId: "%5", width: 43, height: 21, left: 133, top: 33 },
|
|
])
|
|
state.mainPane = {
|
|
paneId: "%0",
|
|
width: 132,
|
|
height: 44,
|
|
left: 0,
|
|
top: 0,
|
|
title: "main",
|
|
isActive: true,
|
|
}
|
|
const mappings: SessionMapping[] = [
|
|
{ sessionId: "old-1", paneId: "%1", createdAt: new Date("2024-01-01") },
|
|
{ sessionId: "old-2", paneId: "%2", createdAt: new Date("2024-01-02") },
|
|
{ sessionId: "old-3", paneId: "%3", createdAt: new Date("2024-01-03") },
|
|
{ sessionId: "old-4", paneId: "%4", createdAt: new Date("2024-01-04") },
|
|
{ sessionId: "old-5", paneId: "%5", createdAt: new Date("2024-01-05") },
|
|
]
|
|
|
|
//#when
|
|
const result = decideSpawnActions(state, "ses-new", "new task", config, mappings)
|
|
|
|
//#then
|
|
expect(result.canSpawn).toBe(false)
|
|
expect(result.actions).toHaveLength(0)
|
|
expect(result.reason).toContain("defer attach")
|
|
})
|
|
})
|