1 files changed, 59 insertions, 0 deletions
diff --git a/testing/web-platform/tests/serial/serialPort_setSignals.https.any.js b/testing/web-platform/tests/serial/serialPort_setSignals.https.any.js
new file mode 100644
index 0000000000..27911ab7db
--- /dev/null
+++ b/testing/web-platform/tests/serial/serialPort_setSignals.https.any.js
@@ -0,0 +1,59 @@
+// META: script=/resources/test-only-api.js
+// META: script=/serial/resources/common.js
+// META: script=resources/automation.js
+
+serial_test(async (t, fake) => {
+  const {port, fakePort} = await getFakeSerialPort(fake);
+  await promise_rejects_dom(t, 'InvalidStateError', port.setSignals({}));
+}, 'setSignals() rejects if the port is not open');
+
+serial_test(async (t, fake) => {
+  const {port, fakePort} = await getFakeSerialPort(fake);
+  await port.open({baudRate: 9600});
+
+  let expectedSignals = {
+    dataTerminalReady: true,
+    requestToSend: false,
+    break: false
+  };
+  assert_object_equals(fakePort.outputSignals, expectedSignals, 'initial');
+
+  await promise_rejects_js(t, TypeError, port.setSignals());
+  assert_object_equals(fakePort.outputSignals, expectedSignals, 'no-op');
+
+  await promise_rejects_js(t, TypeError, port.setSignals({}));
+  assert_object_equals(fakePort.outputSignals, expectedSignals, 'no-op');
+
+  await port.setSignals({dataTerminalReady: false});
+  expectedSignals.dataTerminalReady = false;
+  assert_object_equals(fakePort.outputSignals, expectedSignals, 'clear DTR');
+
+  await port.setSignals({requestToSend: true});
+  expectedSignals.requestToSend = true;
+  assert_object_equals(fakePort.outputSignals, expectedSignals, 'set RTS');
+
+  await port.setSignals({break: true});
+  expectedSignals.break = true;
+  assert_object_equals(fakePort.outputSignals, expectedSignals, 'set BRK');
+
+  await port.setSignals(
+      {dataTerminalReady: true, requestToSend: false, break: false});
+  expectedSignals.dataTerminalReady = true;
+  expectedSignals.requestToSend = false;
+  expectedSignals.break = false;
+  assert_object_equals(fakePort.outputSignals, expectedSignals, 'invert');
+}, 'setSignals() modifies the state of the port');
+
+serial_test(async (t, fake) => {
+  const {port, fakePort} = await getFakeSerialPort(fake);
+  await port.open({baudRate: 9600});
+
+  fakePort.simulateOutputSignalFailure(true);
+  await promise_rejects_dom(t, 'NetworkError', port.setSignals({break: true}));
+
+  fakePort.simulateOutputSignalFailure(false);
+  await port.setSignals({break: true});
+  assert_true(fakePort.outputSignals.break);
+
+  await port.close();
+}, 'setSignals() rejects on failure');