Add workspace changes plugin

packages/plugins/plugin-workspace-diff/tests/diff-model.spec.ts

@@ -0,0 +1,64 @@
+import { describe, expect, it } from "vitest";
+import {
+  buildFilePatch,
+  diffSummary,
+  nextExpandedFileSet,
+  statusLabel,
+  toFileViewModels,
+} from "../src/diff-model.js";
+import { changedFile, diffResponse } from "./fixtures.js";
+
+describe("workspace diff UI model", () => {
+  it("summarizes changed files and line counts", () => {
+    const diff = diffResponse();
+
+    expect(diffSummary(diff)).toMatchObject({
+      changedLabel: "1 file",
+      lineLabel: "+1 / -1",
+      warningCount: 0,
+      truncated: false,
+    });
+    expect(toFileViewModels(diff)[0]).toMatchObject({
+      path: "src/app.ts",
+      status: "modified",
+      patchKinds: ["unstaged"],
+    });
+  });
+
+  it("represents empty workspace diffs", () => {
+    const diff = diffResponse({ files: [] });
+
+    expect(toFileViewModels(diff)).toEqual([]);
+    expect(diffSummary(diff).changedLabel).toBe("0 files");
+  });
+
+  it("surfaces truncation and file warnings", () => {
+    const file = changedFile({
+      truncated: true,
+      warnings: [{ code: "patch_truncated", message: "Patch was truncated.", path: "src/app.ts" }],
+      patches: [],
+    });
+    const diff = diffResponse({ files: [file], truncated: true });
+
+    expect(buildFilePatch(file)).toBeNull();
+    expect(diffSummary(diff)).toMatchObject({
+      warningCount: 1,
+      truncated: true,
+    });
+  });
+
+  it("toggles expanded file state without mutating the current set", () => {
+    const current = new Set(["a.ts"]);
+    const collapsed = nextExpandedFileSet(current, "a.ts");
+    const expanded = nextExpandedFileSet(current, "b.ts");
+
+    expect(current.has("a.ts")).toBe(true);
+    expect(collapsed.has("a.ts")).toBe(false);
+    expect(expanded.has("b.ts")).toBe(true);
+  });
+
+  it("labels file statuses for the sidebar", () => {
+    expect(statusLabel("untracked")).toBe("Untracked");
+    expect(statusLabel("type_changed")).toBe("Type changed");
+  });
+});