Diagnostics: Implement a fake SystemDataProvider

-Implemented the first method getSystemInfo()

Bug: 1125150
Test: browser_tests --gtest_filter=DiagnosticsApp*
Change-Id: I57ec7aedb0dbc990e9d62f4dbd18ec26a469e542
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2417509
Commit-Queue: Zentaro Kavanagh <zentaro@chromium.org>
Reviewed-by: Bailey Berro <baileyberro@chromium.org>
Cr-Commit-Position: refs/heads/master@{#808581}

chrome/test/data/webui/chromeos/diagnostics/diagnostics_test.js

@@ -8,6 +8,7 @@ import 'chrome://diagnostics/diagnostics_app.js';
 
 import {SystemDataProviderInterface} from 'chrome://diagnostics/diagnostics_types.js';
 import {FakeMethodResolver} from 'chrome://diagnostics/fake_method_resolver.js';
+import {FakeSystemDataProvider} from 'chrome://diagnostics/fake_system_data_provider.js';
 import {getSystemDataProvider, setSystemDataProviderForTesting} from 'chrome://diagnostics/mojo_interface_provider.js';
 
 suite('DiagnosticsFakeMethodResolver', () => {
@@ -80,3 +81,43 @@ suite('FakeMojoProviderTest', () => {
     assertEquals(fake_provider, getSystemDataProvider());
   });
 });
+
+suite('FakeSystemDataProviderTest', () => {
+  /** @type {?FakeSystemDataProvider} */
+  let provider = null;
+
+  setup(function() {
+    provider = new FakeSystemDataProvider();
+  });
+
+  teardown(function() {
+    provider = null;
+  });
+
+  test('GetSystemInfo', () => {
+    /** @type {!DeviceCapabilities} */
+    const capabilities = {
+      has_battery: true,
+    };
+
+    /** @type {!VersionInfo} */
+    const version = {
+      milestone_version: 'M97',
+    };
+
+    /** @type {!SystemInfo} */
+    const expected = {
+      board_name: 'BestBoard',
+      cpu_model: 'SuperFast CPU',
+      total_memory_kib: 9999,
+      cores_number: 4,
+      version_info: version,
+      device_capabilities: capabilities,
+    };
+
+    provider.setFakeSystemInfo(expected);
+    return provider.getSystemInfo().then((systemInfo) => {
+      assertDeepEquals(expected, systemInfo);
+    });
+  });
+});

chromeos/components/diagnostics_ui/resources/BUILD.gn

@@ -14,6 +14,7 @@ js_type_check("closure_compile_module") {
     ":diagnostics_card",
     ":diagnostics_types",
     ":fake_method_resolver",
+    ":fake_system_data_provider",
     ":mojo_interface_provider",
   ]
 }
@@ -38,6 +39,10 @@ js_library("fake_method_resolver") {
   deps = [ "//ui/webui/resources/js:cr.m" ]
 }
 
+js_library("fake_system_data_provider") {
+  deps = [ "//ui/webui/resources/js:cr.m" ]
+}
+
 js_library("mojo_interface_provider") {
   deps = [ "//ui/webui/resources/js:cr.m" ]
 }

chromeos/components/diagnostics_ui/resources/diagnostics_app_resources.grd

@@ -17,6 +17,7 @@
       <include name="IDR_DIAGNOSTICS_APP_INDEX_HTML" file="index.html" type="BINDATA" />
       <include name="IDR_DIAGNOSTICS_APP_JS" file="${root_gen_dir}/chromeos/components/diagnostics_ui/resources/diagnostics_app.js" use_base_dir="false" type="BINDATA"/>
       <include name="IDR_DIAGNOSTICS_FAKE_METHOD_RESOLVER_JS" file="fake_method_resolver.js" type="BINDATA"/>
+      <include name="IDR_DIAGNOSTICS_FAKE_SYSTEM_DATA_PROVIDER_JS" file="fake_system_data_provider.js" type="BINDATA"/>
       <include name="IDR_DIAGNOSTICS_MOJO_INTERFACE_PROVIDER_JS" file="mojo_interface_provider.js" type="BINDATA"/>
       <include name="IDR_DIAGNOSTICS_SHARED_CSS_JS" file="${root_gen_dir}/chromeos/components/diagnostics_ui/resources/diagnostics_shared_css.js" use_base_dir="false" type="BINDDATA"/>
       <include name="IDR_DIAGNOSTICS_TYPES_JS" file="diagnostics_types.js" type="BINDATA"/>

chromeos/components/diagnostics_ui/resources/diagnostics_types.js

@@ -16,3 +16,32 @@
  * @typedef {!Object}
  */
 export let SystemDataProviderInterface;
+
+/**
+ * Type alias for DeviceCapabilities.
+ * @typedef {{
+ *   has_battery: boolean,
+ * }}
+ */
+export let DeviceCapabilities;
+
+/**
+ * Type alias for VersionInfo.
+ * @typedef {{
+ *   milestone_version: string,
+ * }}
+ */
+export let VersionInfo;
+
+/**
+ * Type alias for SystemInfo.
+ * @typedef {{
+ *   board_name: string,
+ *   cpu_model_name: string,
+ *   cpu_threads_count: number,
+ *   device_capabilities: DeviceCapabilities,
+ *   total_memory_kib: number,
+ *   version: VersionInfo,
+ * }}
+ */
+export let SystemInfo;

chromeos/components/diagnostics_ui/resources/fake_system_data_provider.js

+// Copyright 2020 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+import {SystemInfo} from './diagnostics_types.js';
+import {FakeMethodResolver} from './fake_method_resolver.js';
+
+/**
+ * @fileoverview
+ * Implements a fake version of the SystemDataProvider mojo interface.
+ */
+
+export class FakeSystemDataProvider {
+  constructor() {
+    /** @private {!FakeMethodResolver} */
+    this.methods_ = new FakeMethodResolver();
+
+    // Setup method resolvers.
+    this.methods_.register('getSystemInfo');
+  }
+
+  /**
+   * @return {!Promise<!SystemInfo>}
+   */
+  getSystemInfo() {
+    return this.methods_.resolveMethod('getSystemInfo');
+  }
+
+  /**
+   * Sets the value that will be returned when calling getSystemInfo().
+   * @param {!SystemInfo} systemInfo
+   */
+  setFakeSystemInfo(systemInfo) {
+    this.methods_.setResult('getSystemInfo', systemInfo);
+  }
+}

chromeos/components/diagnostics_ui/resources/mojo_interface_provider.js

@@ -3,7 +3,8 @@
 // found in the LICENSE file.
 
 import {assert} from 'chrome://resources/js/assert.m.js';
-import {SystemDataProviderInterface} from './diagnostics_types.js'
+import {SystemDataProviderInterface, SystemInfo} from './diagnostics_types.js'
+import {FakeMethodResolver} from './fake_method_resolver.js'
 
 /**
  * @fileoverview