feat: make /init a background subagent (#1208)

src/tests/cli/init-background-subagent.test.ts

@@ -0,0 +1,73 @@
+import { describe, expect, test } from "bun:test";
+import { readFileSync } from "node:fs";
+import { fileURLToPath } from "node:url";
+
+describe("init background subagent wiring", () => {
+  const readSource = (relativePath: string) =>
+    readFileSync(
+      fileURLToPath(new URL(relativePath, import.meta.url)),
+      "utf-8",
+    );
+
+  test("App.tsx checks pending approvals before either branch", () => {
+    const appSource = readSource("../../cli/App.tsx");
+
+    // The approval check must appear before the MemFS branch
+    const approvalIdx = appSource.indexOf(
+      "checkPendingApprovalsForSlashCommand",
+      appSource.indexOf('trimmed === "/init"'),
+    );
+    const memfsBranchIdx = appSource.indexOf(
+      "isMemfsEnabled",
+      appSource.indexOf('trimmed === "/init"'),
+    );
+    expect(approvalIdx).toBeGreaterThan(-1);
+    expect(memfsBranchIdx).toBeGreaterThan(-1);
+    expect(approvalIdx).toBeLessThan(memfsBranchIdx);
+  });
+
+  test("App.tsx branches on MemFS: background subagent vs legacy processConversation", () => {
+    const appSource = readSource("../../cli/App.tsx");
+
+    // MemFS path — background subagent
+    expect(appSource).toContain("hasActiveInitSubagent()");
+    expect(appSource).toContain("buildMemoryInitRuntimePrompt({");
+    expect(appSource).toContain("spawnBackgroundSubagentTask({");
+    expect(appSource).toContain('subagentType: "init"');
+    expect(appSource).toContain("silentCompletion: true");
+    expect(appSource).toContain("appendTaskNotificationEvents(");
+    expect(appSource).toContain("Learning about you and your codebase");
+
+    // Legacy non-MemFS path — primary agent
+    expect(appSource).toContain("buildLegacyInitMessage({");
+    expect(appSource).toContain("processConversation(");
+  });
+
+  test("initCommand.ts exports all helpers", () => {
+    const helperSource = readSource("../../cli/helpers/initCommand.ts");
+
+    expect(helperSource).toContain("export function hasActiveInitSubagent(");
+    expect(helperSource).toContain("export function gatherGitContext()");
+    expect(helperSource).toContain(
+      "export function buildMemoryInitRuntimePrompt(",
+    );
+    expect(helperSource).toContain("export function buildLegacyInitMessage(");
+  });
+
+  test("init.md exists as a builtin subagent", () => {
+    const content = readSource("../../agent/subagents/builtin/init.md");
+
+    expect(content).toContain("name: init");
+    expect(content).toContain("skills: initializing-memory");
+    expect(content).toContain("permissionMode: bypassPermissions");
+  });
+
+  test("init subagent is registered in BUILTIN_SOURCES", () => {
+    const indexSource = readSource("../../agent/subagents/index.ts");
+
+    expect(indexSource).toContain(
+      'import initAgentMd from "./builtin/init.md"',
+    );
+    expect(indexSource).toContain("initAgentMd");
+  });
+});