1 files changed, 108 insertions, 0 deletions
diff --git a/test/profile/browser-process-test.ts b/test/profile/browser-process-test.ts
new file mode 100644
index 0000000..29982e5
--- /dev/null
+++ b/test/profile/browser-process-test.ts
@@ -0,0 +1,108 @@
+/**
+ * Unit tests for browser-process parsing and candidate ranking — no browser.
+ *
+ * Ranking exists because a machine can run several Chromium browsers at once.
+ * Picking the wrong one means launching a profile window into a browser the
+ * harness is not connected to: the agent sees nothing, and a browser the user
+ * never pointed us at gets a new window. (That is exactly what happened during
+ * development before ranking existed.)
+ *
+ * Run: npx tsx test/profile/browser-process-test.ts
+ */
+import { homedir } from "node:os";
+import { join } from "node:path";
+import { parseUserDataDirFlag, rankBrowserCandidate } from "../../src/profile/browser-process";
+
+let passed = 0;
+let failed = 0;
+const check = (cond: boolean, label: string): void => {
+  if (cond) {
+    passed++;
+    console.log(`  ✓ ${label}`);
+  } else {
+    failed++;
+    console.error(`  ✗ ${label}`);
+  }
+};
+
+function main(): void {
+  // B1: --user-data-dir parsing
+  {
+    check(
+      parseUserDataDirFlag("/opt/google/chrome/chrome --user-data-dir=/tmp/x --foo") === "/tmp/x",
+      "B1: bare value parsed",
+    );
+    check(
+      parseUserDataDirFlag('chrome.exe --user-data-dir="C:\\Users\\Some Name\\Data" --bar') ===
+        "C:\\Users\\Some Name\\Data",
+      "B1: double-quoted value with spaces parsed",
+    );
+    check(
+      parseUserDataDirFlag("chrome --user-data-dir='/home/u/my dir'") === "/home/u/my dir",
+      "B1: single-quoted value parsed",
+    );
+    check(parseUserDataDirFlag("/opt/google/chrome/chrome") === undefined, "B1: absent flag → undefined");
+    check(parseUserDataDirFlag("chrome --user-data-dir=") === undefined, "B1: empty value → undefined");
+  }
+
+  // B2: an explicit --user-data-dir is decisive in both directions
+  {
+    const target = "/tmp/pi-e2e-abc";
+    const match = rankBrowserCandidate({ exePath: "/opt/google/chrome/chrome", explicitUserDataDir: target }, target);
+    const other = rankBrowserCandidate(
+      { exePath: "/opt/google/chrome/chrome", explicitUserDataDir: "/tmp/somewhere-else" },
+      target,
+    );
+    const noFlag = rankBrowserCandidate({ exePath: "/opt/google/chrome/chrome" }, target);
+    check(match > noFlag, "B2: exact user-data-dir match outranks a flagless process");
+    check(other < noFlag, "B2: a DIFFERENT explicit user-data-dir ranks below a flagless process");
+    check(other === 0, "B2: a different explicit dir is disqualified outright");
+  }
+
+  // B3: browser family match decides between flagless processes
+  {
+    const braveDir = join(homedir(), ".config/BraveSoftware/Brave-Browser");
+    const brave = rankBrowserCandidate({ exePath: "/usr/bin/brave-browser" }, braveDir);
+    const chrome = rankBrowserCandidate({ exePath: "/opt/google/chrome/chrome" }, braveDir);
+    check(brave > chrome, "B3: Brave wins for a Brave user-data-dir");
+
+    const chromeDir = join(homedir(), ".config/google-chrome");
+    check(
+      rankBrowserCandidate({ exePath: "/opt/google/chrome/chrome" }, chromeDir) >
+        rankBrowserCandidate({ exePath: "/usr/bin/brave-browser" }, chromeDir),
+      "B3: Chrome wins for a Chrome user-data-dir",
+    );
+
+    const chromiumDir = join(homedir(), ".config/chromium");
+    check(
+      rankBrowserCandidate({ exePath: "/usr/bin/chromium" }, chromiumDir) >
+        rankBrowserCandidate({ exePath: "/opt/google/chrome/chrome" }, chromiumDir),
+      "B3: Chromium is not mistaken for Chrome",
+    );
+  }
+
+  // B4: no preference expressed → every candidate is equally acceptable
+  {
+    check(
+      rankBrowserCandidate({ exePath: "/usr/bin/brave-browser" }) ===
+        rankBrowserCandidate({ exePath: "/opt/google/chrome/chrome" }),
+      "B4: without a target dir, candidates rank equally",
+    );
+  }
+
+  // B5: Windows path comparison ignores case and separator style
+  if (process.platform === "win32") {
+    check(
+      rankBrowserCandidate(
+        { exePath: "C:\\Program Files\\Google\\Chrome\\Application\\chrome.exe", explicitUserDataDir: "C:\\Users\\U\\Data" },
+        "c:/users/u/data",
+      ) === 4,
+      "B5 win: case and separator differences still match",
+    );
+  }
+
+  console.log(`\n${passed} passed, ${failed} failed`);
+  process.exit(failed === 0 ? 0 : 1);
+}
+
+main();