feat(browser): prefer default chromium browser

src/browser/chrome.default-browser.test.ts

@@ -0,0 +1,72 @@
+import { describe, expect, it, vi, beforeEach } from "vitest";
+
+vi.mock("node:child_process", () => ({
+  execFileSync: vi.fn(),
+}));
+vi.mock("node:fs", () => {
+  const existsSync = vi.fn();
+  const readFileSync = vi.fn();
+  return {
+    existsSync,
+    readFileSync,
+    default: { existsSync, readFileSync },
+  };
+});
+import { execFileSync } from "node:child_process";
+import * as fs from "node:fs";
+
+describe("browser default executable detection", () => {
+  beforeEach(() => {
+    vi.resetModules();
+    vi.clearAllMocks();
+  });
+
+  it("prefers default Chromium browser on macOS", async () => {
+    vi.mocked(execFileSync).mockImplementation((cmd, args) => {
+      const argsStr = Array.isArray(args) ? args.join(" ") : "";
+      if (cmd === "/usr/bin/osascript" && argsStr.includes("id of application")) {
+        return "com.google.Chrome";
+      }
+      if (cmd === "/usr/bin/osascript" && argsStr.includes("POSIX path")) {
+        return "/Applications/Google Chrome.app";
+      }
+      if (cmd === "/usr/bin/defaults") {
+        return "Google Chrome";
+      }
+      return "";
+    });
+    vi.mocked(fs.existsSync).mockImplementation((p) =>
+      String(p).includes("/Applications/Google Chrome.app/Contents/MacOS/Google Chrome"),
+    );
+
+    const { resolveBrowserExecutableForPlatform } = await import("./chrome.executables.js");
+    const exe = resolveBrowserExecutableForPlatform(
+      {} as Parameters<typeof resolveBrowserExecutableForPlatform>[0],
+      "darwin",
+    );
+
+    expect(exe?.path).toContain("Google Chrome.app/Contents/MacOS/Google Chrome");
+    expect(exe?.kind).toBe("chrome");
+  });
+
+  it("falls back when default browser is non-Chromium on macOS", async () => {
+    vi.mocked(execFileSync).mockImplementation((cmd, args) => {
+      const argsStr = Array.isArray(args) ? args.join(" ") : "";
+      if (cmd === "/usr/bin/osascript" && argsStr.includes("id of application")) {
+        return "com.apple.Safari";
+      }
+      return "";
+    });
+    vi.mocked(fs.existsSync).mockImplementation((p) =>
+      String(p).includes("Google Chrome.app/Contents/MacOS/Google Chrome"),
+    );
+
+    const { resolveBrowserExecutableForPlatform } = await import("./chrome.executables.js");
+    const exe = resolveBrowserExecutableForPlatform(
+      {} as Parameters<typeof resolveBrowserExecutableForPlatform>[0],
+      "darwin",
+    );
+
+    expect(exe?.path).toContain("Google Chrome.app/Contents/MacOS/Google Chrome");
+  });
+});