1 files changed, 88 insertions, 0 deletions
diff --git a/src/features/workspaces/ui/ResizePicker.test.ts b/src/features/workspaces/ui/ResizePicker.test.ts
new file mode 100644
index 0000000..796a556
--- /dev/null
+++ b/src/features/workspaces/ui/ResizePicker.test.ts
@@ -0,0 +1,88 @@
+import { render, screen } from "@testing-library/svelte";
+import userEvent from "@testing-library/user-event";
+import { describe, expect, it, vi } from "vitest";
+import { geometryFor } from "../logic/tile-layout";
+import ResizePicker from "./ResizePicker.svelte";
+
+const WIDE = geometryFor(1920, 1080);
+const TALL = geometryFor(390, 844);
+
+function props() {
+  return {
+    onPreview: vi.fn(),
+    onCommit: vi.fn(),
+    onCancel: vi.fn(),
+  };
+}
+
+describe("ResizePicker", () => {
+  it("renders one small square per cap (4×2 wide, 2×2 tall)", () => {
+    const p = props();
+    const wide = render(ResizePicker, {
+      props: { geometry: WIDE, initial: { colSpan: 1, rowSpan: 1 }, ...p },
+    });
+    expect(screen.getAllByRole("button")).toHaveLength(8);
+    wide.unmount();
+
+    render(ResizePicker, {
+      props: { geometry: TALL, initial: { colSpan: 1, rowSpan: 1 }, ...p },
+    });
+    expect(screen.getAllByRole("button")).toHaveLength(4);
+  });
+
+  it("hovering square (r, c) previews that rectangle", async () => {
+    const user = userEvent.setup();
+    const p = props();
+    render(ResizePicker, {
+      props: { geometry: WIDE, initial: { colSpan: 1, rowSpan: 1 }, ...p },
+    });
+
+    await user.hover(screen.getByRole("button", { name: "Resize to 3 by 2" }));
+    expect(p.onPreview).toHaveBeenCalledWith({ colSpan: 3, rowSpan: 2 });
+  });
+
+  it("clicking a square commits that size", async () => {
+    const user = userEvent.setup();
+    const p = props();
+    render(ResizePicker, {
+      props: { geometry: WIDE, initial: { colSpan: 1, rowSpan: 1 }, ...p },
+    });
+
+    await user.click(screen.getByRole("button", { name: "Resize to 2 by 1" }));
+    expect(p.onCommit).toHaveBeenCalledWith(2, 1);
+  });
+
+  it("arrow keys move within the picker, Enter commits, Escape cancels", async () => {
+    const user = userEvent.setup();
+    const p = props();
+    render(ResizePicker, {
+      props: { geometry: WIDE, initial: { colSpan: 2, rowSpan: 1 }, ...p },
+    });
+
+    await user.keyboard("{ArrowRight}");
+    expect(p.onPreview).toHaveBeenLastCalledWith({ colSpan: 3, rowSpan: 1 });
+    await user.keyboard("{ArrowDown}");
+    expect(p.onPreview).toHaveBeenLastCalledWith({ colSpan: 3, rowSpan: 2 });
+    await user.keyboard("{ArrowLeft}");
+    expect(p.onPreview).toHaveBeenLastCalledWith({ colSpan: 2, rowSpan: 2 });
+
+    await user.keyboard("{Enter}");
+    expect(p.onCommit).toHaveBeenCalledWith(2, 2);
+    expect(p.onCancel).not.toHaveBeenCalled();
+
+    await user.keyboard("{Escape}");
+    expect(p.onCancel).toHaveBeenCalledTimes(1);
+  });
+
+  it("leaving the picker clears the preview", async () => {
+    const user = userEvent.setup();
+    const p = props();
+    render(ResizePicker, {
+      props: { geometry: WIDE, initial: { colSpan: 1, rowSpan: 1 }, ...p },
+    });
+
+    await user.hover(screen.getByRole("button", { name: "Resize to 4 by 2" }));
+    await user.unhover(screen.getByRole("button", { name: "Resize to 4 by 2" }));
+    expect(p.onPreview).toHaveBeenLastCalledWith(null);
+  });
+});