1 files changed, 45 insertions, 0 deletions
diff --git a/test/cdp/commands-test.ts b/test/cdp/commands-test.ts
new file mode 100644
index 0000000..b316f68
--- /dev/null
+++ b/test/cdp/commands-test.ts
@@ -0,0 +1,45 @@
+import { test, describe } from "node:test";
+import assert from "node:assert/strict";
+import { COMMANDS, decodeResult } from "../../src/cdp/commands";
+
+describe("cdp command table", () => {
+  test("decodes a well-formed response", () => {
+    const r = decodeResult("Target.attachToTarget", { sessionId: "s1" });
+    assert.equal(r.success, true);
+    if (r.success) assert.equal(r.data.sessionId, "s1");
+  });
+
+  test("rejects a response with a wrong field type", () => {
+    const r = decodeResult("Browser.getWindowForTarget", { windowId: "not-a-number" });
+    assert.equal(r.success, false);
+    if (!r.success) {
+      assert.equal(r.error.kind, "invalid_response");
+      assert.equal(r.error.method, "Browser.getWindowForTarget");
+      assert.match(r.error.message, /must be number/);
+    }
+  });
+
+  test("rejects a response missing a required field", () => {
+    const r = decodeResult("Target.attachToTarget", {});
+    assert.equal(r.success, false);
+  });
+
+  test("rejects a non-object response", () => {
+    const r = decodeResult("Target.attachToTarget", null);
+    assert.equal(r.success, false);
+  });
+
+  test("every table entry has both params and result schemas", () => {
+    for (const [method, spec] of Object.entries(COMMANDS)) {
+      assert.ok(spec.params, `${method} missing params schema`);
+      assert.ok(spec.result, `${method} missing result schema`);
+      assert.ok(spec.validate, `${method} missing compiled validator`);
+    }
+  });
+
+  test("an unknown method decodes to an error rather than throwing", () => {
+    // Types prevent this, but a daemon could echo an unexpected method name.
+    const r = decodeResult("Nope.method" as "Page.enable", {});
+    assert.equal(r.success, false);
+  });
+});