test(frontend): add unit tests for DatasetVersionSelectorComponent

frontend/src/app/workspace/component/dataset-version-selector/dataset-version-selector.component.spec.ts

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+/**
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you 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 { ComponentFixture, TestBed } from "@angular/core/testing";
+import { FormControl } from "@angular/forms";
+import { FieldTypeConfig } from "@ngx-formly/core";
+import { of } from "rxjs";
+import { NzModalService } from "ng-zorro-antd/modal";
+import { DatasetVersionSelectorComponent } from "./dataset-version-selector.component";
+
+describe("DatasetVersionSelectorComponent", () => {
+  let component: DatasetVersionSelectorComponent;
+  let fixture: ComponentFixture<DatasetVersionSelectorComponent>;
+  // The component's only dependency is NzModalService, and it only reads
+  // `afterClose` off the returned modal ref. Each test overrides what
+  // `afterClose` emits via `mockReturnValue`.
+  let modalServiceSpy: { create: ReturnType<typeof vi.fn> };
+
+  // Attach a fresh FormControl with a known starting value, since the component
+  // extends FieldType and reads/writes through `this.formControl`.
+  function setFormControl(initialValue: string): FormControl {
+    const formControl = new FormControl(initialValue);
+    component.field = { formControl } as FieldTypeConfig;
+    return formControl;
+  }
+
+  beforeEach(async () => {
+    modalServiceSpy = { create: vi.fn() };
+
+    await TestBed.configureTestingModule({
+      imports: [DatasetVersionSelectorComponent],
+      providers: [{ provide: NzModalService, useValue: modalServiceSpy }],
+    }).compileComponents();
+
+    fixture = TestBed.createComponent(DatasetVersionSelectorComponent);
+    component = fixture.componentInstance;
+  });
+
+  it("should create", () => {
+    expect(component).toBeTruthy();
+  });
+
+  it("opens the dataset selection modal once when clicked", () => {
+    modalServiceSpy.create.mockReturnValue({ afterClose: of(undefined) });
+    setFormControl("");
+
+    component.onClickOpenDatasetSelectionModal();
+
+    expect(modalServiceSpy.create).toHaveBeenCalledTimes(1);
+  });
+
+  it("writes the chosen path back into the form control when a version is selected", () => {
+    const formControl = setFormControl("");
+    modalServiceSpy.create.mockReturnValue({ afterClose: of("/dataset/v1") });
+
+    component.onClickOpenDatasetSelectionModal();
+
+    expect(formControl.value).toBe("/dataset/v1");
+  });
+
+  it("leaves the form control unchanged when the modal is dismissed without a value", () => {
+    const formControl = setFormControl("/existing/v2");
+    modalServiceSpy.create.mockReturnValue({ afterClose: of("") });
+
+    component.onClickOpenDatasetSelectionModal();
+
+    expect(formControl.value).toBe("/existing/v2");
+  });
+});