test: raise vitest coverage

src/agents/index.test.ts

@@ -0,0 +1,12 @@
+import { describe, expect, it } from "vitest";
+
+import { getAgentSpec } from "./index.js";
+
+describe("agents index", () => {
+  it("returns a spec for pi", () => {
+    const spec = getAgentSpec("pi");
+    expect(spec).toBeTruthy();
+    expect(spec.kind).toBe("pi");
+    expect(typeof spec.parseOutput).toBe("function");
+  });
+});

src/agents/pi-path.test.ts

@@ -0,0 +1,34 @@
+import fs from "node:fs";
+import path from "node:path";
+
+import { describe, expect, it, vi } from "vitest";
+
+import { resolveBundledPiBinary } from "./pi-path.js";
+
+describe("pi-path", () => {
+  it("resolves to a bundled binary path when available", () => {
+    const resolved = resolveBundledPiBinary();
+    expect(resolved === null || typeof resolved === "string").toBe(true);
+    if (typeof resolved === "string") {
+      expect(resolved).toMatch(/pi-coding-agent/);
+      expect(resolved).toMatch(/dist\/pi|dist\/cli\.js|bin\/tau-dev\.mjs/);
+    }
+  });
+
+  it("prefers dist/pi when present (branch coverage)", () => {
+    const original = fs.existsSync.bind(fs);
+    const spy = vi.spyOn(fs, "existsSync").mockImplementation((p) => {
+      const s = String(p);
+      if (s.endsWith(path.join("dist", "pi"))) return true;
+      return original(p);
+    });
+    try {
+      const resolved = resolveBundledPiBinary();
+      expect(resolved).not.toBeNull();
+      expect(typeof resolved).toBe("string");
+      expect(resolved).toMatch(/dist\/pi$/);
+    } finally {
+      spy.mockRestore();
+    }
+  });
+});