1 files changed, 29 insertions, 0 deletions
diff --git a/test/cdp/discovery-test.ts b/test/cdp/discovery-test.ts
new file mode 100644
index 0000000..7fc18fb
--- /dev/null
+++ b/test/cdp/discovery-test.ts
@@ -0,0 +1,29 @@
+import { test, describe } from "node:test";
+import assert from "node:assert/strict";
+import { endpointFromEnv } from "../../src/cdp/discovery";
+
+describe("BU_CDP_WS endpoint override", () => {
+  test("an unset variable leaves discovery to run normally", () => {
+    assert.equal(endpointFromEnv({}), undefined);
+  });
+
+  test("a set variable becomes the endpoint", () => {
+    const e = endpointFromEnv({ BU_CDP_WS: "ws://127.0.0.1:9333/devtools/browser/abc" });
+    assert.equal(e?.wsUrl, "ws://127.0.0.1:9333/devtools/browser/abc");
+  });
+
+  test("no userDataDir is claimed for a remote endpoint", () => {
+    const e = endpointFromEnv({ BU_CDP_WS: "ws://example.test/x" });
+    assert.equal(e?.userDataDir, undefined);
+  });
+
+  test("surrounding whitespace is trimmed", () => {
+    const e = endpointFromEnv({ BU_CDP_WS: "  ws://127.0.0.1:9222/x  " });
+    assert.equal(e?.wsUrl, "ws://127.0.0.1:9222/x");
+  });
+
+  test("an empty or whitespace-only variable is ignored, not treated as an endpoint", () => {
+    assert.equal(endpointFromEnv({ BU_CDP_WS: "" }), undefined);
+    assert.equal(endpointFromEnv({ BU_CDP_WS: "   " }), undefined);
+  });
+});