[Do not commit] Sample USB layout tests with Mojo service mocks

third_party/WebKit/LayoutTests/usb/resources/usb-helpers.js

Index: third_party/WebKit/LayoutTests/usb/resources/usb-helpers.js
diff --git a/third_party/WebKit/LayoutTests/usb/resources/usb-helpers.js b/third_party/WebKit/LayoutTests/usb/resources/usb-helpers.js
new file mode 100644
index 0000000000000000000000000000000000000000..7d0c65a41f7b606c9f580cfe05aa92d43a584688
--- /dev/null
+++ b/third_party/WebKit/LayoutTests/usb/resources/usb-helpers.js
@@ -0,0 +1,148 @@
+'use strict';
+
+function usb_test(func, name, properties) {
+  mojo_test(mojo => {
+    return new Promise((resolve, reject) => {
+      define('USB layout test: ' + name, [
+        'device/devices_app/usb/public/interfaces/device_manager.mojom',
+        'device/devices_app/usb/public/interfaces/device.mojom',
+        'device/devices_app/usb/public/interfaces/permission_provider.mojom'
+      ], (deviceManager, device, permissionProvider) => {
+        class MockDevice extends device.Device.stubClass {
+          constructor(info, pipe) {
+            super();
+            this.info_ = info;
+            this.router_ = new mojo.router.Router(pipe);
+            this.router_.setIncomingReceiver(this);
+          }
+
+          getDeviceInfo() { return { info: this.info_ }; }
+          getConfiguration() {  throw 'Not implemented!'; }
+          open() { throw 'Not implemented!'; }
+          close() { throw 'Not implemented!'; }
+          setConfiguration(value) { throw 'Not implemented!'; }
+          claimInterface(interfaceNumber) { throw 'Not implemented!'; }
+          releaseInterface(interfaceNumber) { throw 'Not implemented!'; }
+          setInterfaceAlternateSetting(interfaceNumber, alternateSetting) {
+            throw 'Not implemented!';
+          }
+          reset() { throw 'Not implemented!'; }
+          clearHalt(endpoint) { throw 'Not implemented!'; }
+          controlTransferIn(params, length, timeout) {
+            throw 'Not implemented!';
+          }
+          controlTransferOut(params, data, timeout) {
+            throw 'Not implemented!';
+          }
+          genericTransferIn(endpointNumber, length, timeout) {
+            throw 'Not implemented!';
+          }
+          genericTransferOut(endpointNumber, data, timeout) {
+            throw 'Not implemented!';
+          }
+          isochronousTransferIn(endpointNumber, numPackets, packetLength,
+                                timeout) {
+            throw 'Not implemented!';
+          }
+          isochronousTransferOut(endpointNumber, packets, timeout) {
+            throw 'Not implemented!';
+          }
+        };
+
+        class MockDeviceManager extends deviceManager.DeviceManager.stubClass {
+          constructor() {
+            super();
+            this.router_ = null;
+            this.lastSeenDevices_ = {};
+            this.mockDevices_ = {};
+          }
+
+          addMockDevice(info) {
+            this.mockDevices_[info.guid] = info;
+          }
+
+          bindToPipe(pipe) {
+            assert_equals(this.router_, null);
+            this.router_ = new mojo.router.Router(pipe);
+            this.router_.setIncomingReceiver(this);
+          }
+
+          getDevices(options) {
+            return Promise.resolve({
+              results: Object.keys(this.mockDevices_).map(
+                  guid => this.mockDevices_[guid]),
+            });
+          }
+
+          getDeviceChanges() {
+            let additions = [];
+            for (let guid in this.mockDevices_)
+              if (!(guid in this.lastSeenDevices_))
+                additions.push(this.mockDevices_[guid]);
+
+            let removals = [];
+            for (let guid in this.lastSeenDevices_)
+              if (!(guid in this.mockDevices_))
+                removals.push(this.mockDevices_[guid]);
+
+            this.lastSeenDevices_ = {};
+            for (let guid in this.mockDevices_)
+              this.lastSeenDevices_[guid] = this.mockDevices_[guid];
+            return Promise.resolve({
+              changes: { devices_added: additions, devices_removed: removals }
+            });
+          }
+
+          getDevice(guid, pipe) {
+            if (guid in this.mockDevices_)
+              new MockDevice(this.mockDevices_[guid], pipe);
+          }
+        }
+
+        let mockDeviceManager = new MockDeviceManager;
+
+        mojo.serviceRegistry.addServiceOverrideForTesting(
+            deviceManager.DeviceManager.name,
+            pipe => {
+              mockDeviceManager.bindToPipe(pipe);
+            });
+
+        mojo.serviceRegistry.addServiceOverrideForTesting(
+            permissionProvider.PermissionProvider.name,
+            pipe => {
+              console.log('Connected to PermissionProvider!');
+            });
+
+        try {
+          resolve(func({
+            DeviceManager: deviceManager.DeviceManager,
+            Device: device.Device,
+            PermissionProvider: permissionProvider.PermissionProvider,
+            mockDeviceManager: mockDeviceManager,
+          }));
+        } catch (e) {
+          reject(e);
+        }
+      });
+    });
+  }, name, properties);
+}
+
+function assert_device_info_equals(device, info) {
+  assert_equals(device.guid, info.guid);
+  assert_equals(device.usbVersionMajor, info.usb_version_major);
+  assert_equals(device.usbVersionMinor, info.usb_version_minor);
+  assert_equals(device.usbVersionSubminor, info.usb_version_subminor);
+  assert_equals(device.deviceClass, info.class_code);
+  assert_equals(device.deviceSubclass, info.subclass_code);
+  assert_equals(device.deviceProtocol, info.protocol_code);
+  assert_equals(device.vendorId, info.vendor_id);
+  assert_equals(device.productId, info.product_id);
+  assert_equals(device.deviceVersionMajor, info.device_version_major);
+  assert_equals(device.deviceVersionMinor, info.device_version_minor);
+  assert_equals(device.deviceVersionSubminor, info.device_version_subminor);
+  assert_equals(device.manufacturerName, info.manufacturer_name);
+  assert_equals(device.productName, info.product_name);
+  assert_equals(device.serialNumber, info.serial_number);
+  assert_equals(device.configurations.length, info.configurations.length);
+};