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import { describe, expect, it } from "vitest";
import type { Tab, TabsState } from "./tabs";
import {
activeTab,
closeTab,
createTab,
deriveTitle,
initialState,
isStuckToEnd,
newDraft,
selectTab,
setModel,
setTitle,
} from "./tabs";
const tab = (conversationId: string, model = "default", title = "Chat"): Tab => ({
conversationId,
model,
title,
});
describe("initialState", () => {
it("returns empty draft state when no persisted state", () => {
const state = initialState();
expect(state.tabs).toEqual([]);
expect(state.activeConversationId).toBeNull();
});
it("returns persisted state when provided", () => {
const persisted: TabsState = {
tabs: [tab("c1")],
activeConversationId: "c1",
};
const state = initialState(persisted);
expect(state.tabs).toHaveLength(1);
expect(state.activeConversationId).toBe("c1");
});
});
describe("newDraft", () => {
it("sets activeConversationId to null", () => {
const state: TabsState = { tabs: [tab("c1")], activeConversationId: "c1" };
const next = newDraft(state);
expect(next.activeConversationId).toBeNull();
});
it("keeps existing tabs", () => {
const state: TabsState = { tabs: [tab("c1"), tab("c2")], activeConversationId: "c1" };
const next = newDraft(state);
expect(next.tabs).toHaveLength(2);
});
});
describe("createTab", () => {
it("appends and activates", () => {
const state = initialState();
const next = createTab(state, tab("c1"));
expect(next.tabs).toHaveLength(1);
expect(next.tabs[0]?.conversationId).toBe("c1");
expect(next.activeConversationId).toBe("c1");
});
it("does not duplicate an existing conversationId", () => {
const state: TabsState = { tabs: [tab("c1")], activeConversationId: "c1" };
const next = createTab(state, tab("c1"));
expect(next.tabs).toHaveLength(1);
});
it("activates an already-existing tab when createTab is called again", () => {
const state: TabsState = { tabs: [tab("c1"), tab("c2")], activeConversationId: "c2" };
const next = createTab(state, tab("c1"));
expect(next.activeConversationId).toBe("c1");
});
});
describe("selectTab", () => {
it("changes active", () => {
const state: TabsState = { tabs: [tab("c1"), tab("c2")], activeConversationId: "c1" };
const next = selectTab(state, "c2");
expect(next.activeConversationId).toBe("c2");
});
});
describe("closeTab", () => {
it("removes the tab", () => {
const state: TabsState = { tabs: [tab("c1"), tab("c2")], activeConversationId: "c1" };
const next = closeTab(state, "c2");
expect(next.tabs).toHaveLength(1);
expect(next.tabs[0]?.conversationId).toBe("c1");
});
it("closing the active tab activates a neighbour (previous preferred)", () => {
const state: TabsState = {
tabs: [tab("c1"), tab("c2"), tab("c3")],
activeConversationId: "c2",
};
const next = closeTab(state, "c2");
expect(next.activeConversationId).toBe("c1");
});
it("closing the first active tab activates the next", () => {
const state: TabsState = {
tabs: [tab("c1"), tab("c2"), tab("c3")],
activeConversationId: "c1",
};
const next = closeTab(state, "c1");
expect(next.activeConversationId).toBe("c2");
});
it("closing the last tab returns to draft (null active)", () => {
const state: TabsState = { tabs: [tab("c1")], activeConversationId: "c1" };
const next = closeTab(state, "c1");
expect(next.tabs).toHaveLength(0);
expect(next.activeConversationId).toBeNull();
});
it("closing a non-active tab does not change active", () => {
const state: TabsState = {
tabs: [tab("c1"), tab("c2"), tab("c3")],
activeConversationId: "c3",
};
const next = closeTab(state, "c1");
expect(next.activeConversationId).toBe("c3");
});
it("closing a non-existent tab is a no-op", () => {
const state: TabsState = { tabs: [tab("c1")], activeConversationId: "c1" };
const next = closeTab(state, "missing");
expect(next).toEqual(state);
});
});
describe("setModel", () => {
it("updates the right tab", () => {
const state: TabsState = { tabs: [tab("c1", "old"), tab("c2")], activeConversationId: "c1" };
const next = setModel(state, "c1", "new-model");
expect(next.tabs[0]?.model).toBe("new-model");
expect(next.tabs[1]?.model).toBe("default");
});
});
describe("setTitle", () => {
it("updates the right tab", () => {
const state: TabsState = { tabs: [tab("c1"), tab("c2")], activeConversationId: "c1" };
const next = setTitle(state, "c1", "Updated title");
expect(next.tabs[0]?.title).toBe("Updated title");
expect(next.tabs[1]?.title).toBe("Chat");
});
});
describe("activeTab", () => {
it("returns the active tab", () => {
const state: TabsState = { tabs: [tab("c1"), tab("c2")], activeConversationId: "c2" };
expect(activeTab(state)?.conversationId).toBe("c2");
});
it("returns null when activeConversationId is null", () => {
const state: TabsState = { tabs: [tab("c1")], activeConversationId: null };
expect(activeTab(state)).toBeNull();
});
it("returns null when active tab is not found in tabs", () => {
const state: TabsState = { tabs: [tab("c1")], activeConversationId: "missing" };
expect(activeTab(state)).toBeNull();
});
});
describe("deriveTitle", () => {
it("truncates long messages with ellipsis", () => {
const msg = "This is a very long message that should be truncated at some point";
expect(deriveTitle(msg, 20)).toBe("This is a very long \u2026");
});
it("returns full message when under max", () => {
expect(deriveTitle("Short", 40)).toBe("Short");
});
it("collapses whitespace", () => {
expect(deriveTitle(" hello world ")).toBe("hello world");
});
it("falls back to 'New chat' for empty input", () => {
expect(deriveTitle("")).toBe("New chat");
expect(deriveTitle(" ")).toBe("New chat");
});
it("uses default max of ~40 chars", () => {
const msg = "a".repeat(50);
const result = deriveTitle(msg);
expect(result).toBe(`${"a".repeat(40)}\u2026`);
});
});
describe("isStuckToEnd", () => {
it("is false when the strip does not overflow", () => {
expect(isStuckToEnd({ scrollLeft: 0, clientWidth: 500, scrollWidth: 500 })).toBe(false);
expect(isStuckToEnd({ scrollLeft: 0, clientWidth: 500, scrollWidth: 400 })).toBe(false);
});
it("is true when overflowing and scrolled to the left", () => {
expect(isStuckToEnd({ scrollLeft: 0, clientWidth: 500, scrollWidth: 1000 })).toBe(true);
});
it("is true when overflowing and scrolled to the middle", () => {
expect(isStuckToEnd({ scrollLeft: 250, clientWidth: 500, scrollWidth: 1000 })).toBe(true);
});
it("is false when overflowing but scrolled fully to the right", () => {
expect(isStuckToEnd({ scrollLeft: 500, clientWidth: 500, scrollWidth: 1000 })).toBe(false);
});
it("treats a 1px subpixel gap at the end as at-rest (epsilon)", () => {
expect(isStuckToEnd({ scrollLeft: 499, clientWidth: 500, scrollWidth: 1000 })).toBe(false);
});
});
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