- Refining the NewMessage type in AgentRunRequest for better type safety.

src/app/components/session-tab/session-tab.component.ts

@@ -15,13 +15,14 @@
  * limitations under the License.
  */
 
-import {Component, EventEmitter, Input, OnInit, Output, Inject} from '@angular/core';
+import {NgClass} from '@angular/common';
+import {ChangeDetectorRef, Component, EventEmitter, Inject, inject, Input, OnInit, Output} from '@angular/core';
 import {MatDialog} from '@angular/material/dialog';
 import {Subject} from 'rxjs';
 import {switchMap} from 'rxjs/operators';
+
 import {Session} from '../../core/models/Session';
-import {SessionService, SESSION_SERVICE} from '../../core/services/session.service';
-import { NgClass } from '@angular/common';
+import {SESSION_SERVICE, SessionService} from '../../core/services/session.service';
 
 @Component({
     selector: 'app-session-tab',
@@ -40,6 +41,7 @@ export class SessionTabComponent implements OnInit {
   sessionList: any[] = [];
 
   private refreshSessionsSubject = new Subject<void>();
+  private readonly changeDetectorRef = inject(ChangeDetectorRef);
 
   constructor(
     @Inject(SESSION_SERVICE) private sessionService: SessionService,
@@ -58,6 +60,7 @@ export class SessionTabComponent implements OnInit {
                   Number(b.lastUpdateTime) - Number(a.lastUpdateTime),
           );
           this.sessionList = res;
+          this.changeDetectorRef.detectChanges();
         });
   }
 

src/app/components/trace-tab/trace-tab.component.spec.ts

@@ -14,27 +14,136 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
+import {HarnessLoader} from '@angular/cdk/testing';
+import {TestbedHarnessEnvironment} from '@angular/cdk/testing/testbed';
 import {ComponentFixture, TestBed} from '@angular/core/testing';
+import {MatExpansionPanelHarness} from '@angular/material/expansion/testing';
+import {NoopAnimationsModule} from '@angular/platform-browser/animations';
 
+import {Span} from '../../core/models/Trace';
+import {TRACE_SERVICE} from '../../core/services/trace.service';
 
+import {MockTraceService} from './../../core/services/testing/mock-trace.service';
 import {TraceTabComponent} from './trace-tab.component';
 
+const MOCK_TRACE_DATA: Span[] = [
+  {
+    name: 'agent.act',
+    start_time: 1733084700000000000,
+    end_time: 1733084760000000000,
+    span_id: 'span-1',
+    trace_id: 'trace-1',
+    attributes: {
+      'event_id': 1,
+      'gcp.vertex.agent.invocation_id': '21332-322222',
+      'gcp.vertex.agent.llm_request':
+          '{"contents":[{"role":"user","parts":[{"text":"Hello"}]},{"role":"agent","parts":[{"text":"Hi. What can I help you with?"}]},{"role":"user","parts":[{"text":"I need help with my project."}]}]}',
+    },
+  },
+  {
+    name: 'tool.invoke',
+    start_time: 1733084705000000000,
+    end_time: 1733084755000000000,
+    span_id: 'span-2',
+    parent_span_id: 'span-1',
+    trace_id: 'trace-1',
+    attributes: {
+      'tool_name': 'project_helper',
+    },
+  },
+];
+
 describe('TraceTabComponent', () => {
   let component: TraceTabComponent;
   let fixture: ComponentFixture<TraceTabComponent>;
+  let loader: HarnessLoader;
 
   beforeEach(async () => {
-    await TestBed.configureTestingModule({
-    imports: [TraceTabComponent]
-})
+    await TestBed
+        .configureTestingModule({
+          imports: [TraceTabComponent, NoopAnimationsModule],
+          providers: [
+            {provide: TRACE_SERVICE, useClass: MockTraceService},
+          ],
+        })
         .compileComponents();
 
     fixture = TestBed.createComponent(TraceTabComponent);
     component = fixture.componentInstance;
+    loader = TestbedHarnessEnvironment.loader(fixture);
     fixture.detectChanges();
   });
 
   it('should create', () => {
     expect(component).toBeTruthy();
   });
+
+  it('should display no invocations if traceData is empty', async () => {
+    const expansionPanels = await loader.getAllHarnesses(
+        MatExpansionPanelHarness,
+    );
+    expect(expansionPanels.length).toBe(0);
+  });
+
+  describe('with trace data', () => {
+    const MOCK_TRACE_DATA_WITH_MULTIPLE_TRACES: Span[] = [
+      ...MOCK_TRACE_DATA,
+      {
+        name: 'agent.act-2',
+        start_time: 1733084700000000000,
+        end_time: 1733084760000000000,
+        span_id: 'span-10',
+        trace_id: 'trace-2',
+        attributes: {
+          'event_id': 10,
+          'gcp.vertex.agent.invocation_id': 'invoc-2',
+          'gcp.vertex.agent.llm_request':
+              '{"contents":[{"role":"user","parts":[{"text":"Another user message"}]}]}',
+        },
+      },
+    ];
+
+    beforeEach(async () => {
+      fixture.componentRef.setInput(
+          'traceData',
+          MOCK_TRACE_DATA_WITH_MULTIPLE_TRACES,
+      );
+      fixture.detectChanges();
+      await fixture.whenStable();
+    });
+
+    it('should group traces by trace_id and display as expansion panels',
+       async () => {
+         const expansionPanels = await loader.getAllHarnesses(
+             MatExpansionPanelHarness,
+         );
+         expect(expansionPanels.length).toBe(2);
+       });
+
+    it('should display user message as panel title', async () => {
+      const expansionPanels = await loader.getAllHarnesses(
+          MatExpansionPanelHarness,
+      );
+      expect(await expansionPanels[0].getTitle())
+          .toBe(
+              'I need help with my project.',
+          );
+      expect(await expansionPanels[1].getTitle()).toBe('Another user message');
+    });
+
+    it('should pass correct data to trace-tree component', async () => {
+      spyOn(component, 'findInvocIdFromTraceId').and.callThrough();
+      const expansionPanels = await loader.getAllHarnesses(
+          MatExpansionPanelHarness,
+      );
+      await expansionPanels[0].expand();
+      fixture.detectChanges();
+
+      expect(component.findInvocIdFromTraceId).toHaveBeenCalledWith('trace-1');
+      const traceTree = fixture.nativeElement.querySelector('app-trace-tree');
+      expect(traceTree).toBeTruthy();
+      // Further inspection of trace-tree inputs would require a harness or
+      // mocking TraceTreeComponent
+    });
+  });
 });

src/app/components/trace-tab/trace-tab.component.ts

@@ -70,6 +70,11 @@ export class TraceTabComponent implements OnInit, OnChanges {
     const eventItem = group?.find(
         item => item.attributes !== undefined &&
             'gcp.vertex.agent.invocation_id' in item.attributes)
+
+    if (!eventItem) {
+      return '[no invocation id found]';
+    }
+
     const requestJson =
         JSON.parse(eventItem.attributes['gcp.vertex.agent.llm_request']) as LlmRequest
     const userContent =

src/app/core/models/AgentRunRequest.ts

@@ -19,7 +19,13 @@ export interface AgentRunRequest {
   appName: string;
   userId: string;
   sessionId: string;
-  newMessage: any;
+  newMessage: {
+    parts: Array<{
+      text?: string,
+      'function_response'?: {id?: string; name?: string; response?: any}
+    }>,
+    role: string,
+  };
   functionCallEventId?: string;
   streaming?: boolean;
   stateDelta?: any;

src/app/core/services/agent.service.spec.ts

@@ -42,7 +42,7 @@ const RUN_SSE_PAYLOAD = {
   sessionId: SESSION_ID,
   appName: TEST_APP_NAME,
   userId: USER_ID,
-  newMessage: NEW_MESSAGE,
+  newMessage: {parts: [{text: NEW_MESSAGE}], role: 'user'},
 };
 
 describe('AgentService', () => {

src/app/directives/resizable-drawer.directive.spec.ts

@@ -0,0 +1,171 @@
+/**
+ * @license
+ * Copyright 2025 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+import {Component} from '@angular/core';
+import {ComponentFixture, TestBed} from '@angular/core/testing';
+import {By} from '@angular/platform-browser';
+
+import {ResizableDrawerDirective} from './resizable-drawer.directive';
+
+// Directive constants
+const SIDE_DRAWER_WIDTH_VAR = '--side-drawer-width';
+const INITIAL_WIDTH = 570;
+const MIN_WIDTH = 310;
+
+// Test constants
+const MOCKED_WINDOW_WIDTH = 2000;
+const MAX_WIDTH = MOCKED_WINDOW_WIDTH / 2;  // 1000
+
+@Component({
+  template: `
+    <div appResizableDrawer>Drawer</div>
+    <div class="resize-handler"></div>
+  `,
+  standalone: true,
+  imports: [ResizableDrawerDirective],
+})
+class TestHostComponent {
+}
+
+describe('ResizableDrawerDirective', () => {
+  let fixture: ComponentFixture<TestHostComponent>;
+  let directiveElement: HTMLElement;
+  let resizeHandle: HTMLElement;
+  let body: HTMLElement;
+  let innerWidthSpy: jasmine.Spy;
+
+  /**
+   * Reads the drawer width from the CSS variable on the root element.
+   */
+  function getDrawerWidth(): number {
+    const widthStr = getComputedStyle(document.documentElement)
+                         .getPropertyValue(SIDE_DRAWER_WIDTH_VAR);
+    return parseFloat(widthStr);
+  }
+
+  /**
+   * Dispatches a mouse event with a given clientX position.
+   */
+  function dispatchMouseEvent(
+      element: EventTarget, type: string, clientX: number) {
+    element.dispatchEvent(new MouseEvent(type, {
+      bubbles: true,
+      clientX,
+    }));
+  }
+
+  beforeEach(() => {
+    TestBed.configureTestingModule({
+      imports: [TestHostComponent],
+    });
+    innerWidthSpy = spyOnProperty(window, 'innerWidth', 'get');
+    innerWidthSpy.and.returnValue(MOCKED_WINDOW_WIDTH);
+    fixture = TestBed.createComponent(TestHostComponent);
+    directiveElement =
+        fixture.debugElement.query(By.directive(ResizableDrawerDirective))
+            .nativeElement;
+    resizeHandle =
+        fixture.debugElement.query(By.css('.resize-handler')).nativeElement;
+    body = document.body;
+    fixture.detectChanges();  // This calls ngAfterViewInit
+    window.dispatchEvent(new Event('resize'));
+  });
+
+  afterEach(() => {
+    document.documentElement.style.removeProperty(SIDE_DRAWER_WIDTH_VAR);
+    body.classList.remove('resizing');
+  });
+
+  it('should set initial width to 570px after view init', () => {
+    // Assert
+    expect(directiveElement.style.width).toBe('var(--side-drawer-width)');
+    expect(getDrawerWidth()).toBe(INITIAL_WIDTH);
+  });
+
+  it('should resize drawer on mouse drag', () => {
+    // Arrange
+    const startClientX = 600;
+    const moveClientX = 650;  // Drag 50px to the right
+    const expectedWidth = INITIAL_WIDTH + (moveClientX - startClientX);
+
+    // Act
+    dispatchMouseEvent(resizeHandle, 'mousedown', startClientX);
+    dispatchMouseEvent(document, 'mousemove', moveClientX);
+    fixture.detectChanges();
+
+    // Assert
+    expect(getDrawerWidth()).toBe(expectedWidth);
+    expect(body.classList).toContain('resizing');
+
+    // Act: Release mouse
+    dispatchMouseEvent(document, 'mouseup', moveClientX);
+    fixture.detectChanges();
+
+    // Assert: Resizing class is removed
+    expect(body.classList).not.toContain('resizing');
+  });
+
+  it('should not resize below min width', () => {
+    // Arrange
+    const startClientX = 600;
+    const moveClientX = 100;  // Attempt to drag far left (-500px)
+
+    // Act
+    dispatchMouseEvent(resizeHandle, 'mousedown', startClientX);
+    dispatchMouseEvent(document, 'mousemove', moveClientX);
+    fixture.detectChanges();
+
+    // Assert
+    expect(getDrawerWidth()).toBe(MIN_WIDTH);
+
+    // Cleanup
+    dispatchMouseEvent(document, 'mouseup', moveClientX);
+  });
+
+  it('should not resize above max width', () => {
+    // Arrange
+    const startClientX = 100;
+    const moveClientX = 9000;  // Attempt to drag far right
+
+    // Act
+    dispatchMouseEvent(resizeHandle, 'mousedown', startClientX);
+    dispatchMouseEvent(document, 'mousemove', moveClientX);
+    fixture.detectChanges();
+
+    // Assert
+    expect(getDrawerWidth()).toBe(MAX_WIDTH);
+
+    // Cleanup
+    dispatchMouseEvent(document, 'mouseup', moveClientX);
+  });
+
+  it('should re-clamp width on window resize if current width exceeds new max width',
+     () => {
+       // Arrange
+       expect(getDrawerWidth()).toBe(INITIAL_WIDTH);  // 570
+       const smallWindowWidth = 800;
+       const expectedClampedWidth = smallWindowWidth / 2;  // 400
+
+       // Act
+       innerWidthSpy.and.returnValue(smallWindowWidth);
+       window.dispatchEvent(new Event('resize'));
+       fixture.detectChanges();
+
+       // Assert
+       expect(getDrawerWidth()).toBe(expectedClampedWidth);
+     });
+});