Add unit tests

libs/components/src/i18n/i18n.component.ts

@@ -91,7 +91,7 @@ export class I18nComponent implements AfterContentInit {
 
     if (tagCount !== this.templateTags.length) {
       this.logService.warning(
-        `The translation for "${this.translationKey}" has ${tagCount} template tags(s), but ${this.templateTags.length} bit-i18n-part directive(s) were found.`,
+        `The translation for "${this.translationKey}" has ${tagCount} template tag(s), but ${this.templateTags.length} bit-i18n-part directive(s) were found.`,
       );
     }
 

libs/components/src/i18n/i18n.spec.ts

@@ -0,0 +1,120 @@
+import { Component } from "@angular/core";
+import { ComponentFixture, TestBed } from "@angular/core/testing";
+import { mock } from "jest-mock-extended";
+
+import { I18nService } from "@bitwarden/common/platform/abstractions/i18n.service";
+import { LogService } from "@bitwarden/common/platform/abstractions/log.service";
+
+import { I18nMockService } from "../utils/i18n-mock.service";
+
+import { I18nPartDirective } from "./i18n-part.directive";
+import { I18nComponent } from "./i18n.component";
+
+@Component({
+  selector: "test",
+  template: `
+    <p [bit-i18n]="translationKey" [args]="args">
+      <a *bit-i18n-part="let text" href="javascript:;">{{ text }}</a>
+      <strong *bit-i18n-part="let text">{{ text }}</strong>
+      <a
+        *bit-i18n-part="let text"
+        href="https://localization.blog/2022/05/16/i18n-best-practices-keep-it-together/"
+      >
+        <strong>{{ text }}</strong>
+      </a>
+    </p>
+  `,
+})
+class TestComponent {
+  translationKey: string;
+  args: any[] = [];
+}
+
+describe("I18nComponent", () => {
+  let component: TestComponent;
+  let fixture: ComponentFixture<TestComponent>;
+  const mockLogService = mock<LogService>();
+
+  beforeEach(async () => {
+    await TestBed.configureTestingModule({
+      declarations: [TestComponent],
+      imports: [I18nComponent, I18nPartDirective],
+      providers: [
+        {
+          provide: I18nService,
+          useFactory: () => {
+            return new I18nMockService({
+              basicExample: () =>
+                `This is an example with <0>link</0> tags and <1>bold</1> tags. The entire sentence can be <2>translated as a whole</2> and re-arranged according to each language's grammar rules.`,
+              outOfOrder: () =>
+                `This is another example with <1>bold</1> tags to show that tag order does not matter and the <0>link</0> tags are after.`,
+              tooManyTags: () => `<0>First</0>, <1>Second</1>, <2>Third</2>, <3>Missing Fourth</3>`,
+              argsExample: (arg1: string) =>
+                `This is an example with <0>link</0> tags and ${arg1}.`,
+            });
+          },
+        },
+        {
+          provide: LogService,
+          useValue: mockLogService,
+        },
+      ],
+    }).compileComponents();
+
+    fixture = TestBed.createComponent(TestComponent);
+    component = fixture.componentInstance;
+  });
+
+  it("should render the basicExample translation with all templates rendered", () => {
+    component.translationKey = "basicExample";
+    fixture.detectChanges();
+    const compiled = fixture.debugElement.nativeElement;
+    expect(compiled.querySelector("p").textContent).toContain(
+      "This is an example with link tags and bold tags. The entire sentence can be translated as a whole and re-arranged according to each language's grammar rules",
+    );
+    expect(compiled.querySelector("a").textContent).toContain("link");
+    expect(compiled.querySelector("strong").textContent).toContain("bold");
+    expect(compiled.querySelector("a > strong").textContent).toContain("translated as a whole");
+  });
+
+  it("should render the outOfOrder translation with all templates rendered", () => {
+    component.translationKey = "outOfOrder";
+    fixture.detectChanges();
+    const compiled = fixture.debugElement.nativeElement;
+    expect(compiled.querySelector("p").textContent).toContain(
+      "This is another example with bold tags to show that tag order does not matter and the link tags are after",
+    );
+    expect(compiled.querySelector("a").textContent).toContain("link");
+    expect(compiled.querySelector("strong").textContent).toContain("bold");
+    expect(compiled.querySelector("a > strong")).toBeNull(); // 3rd tag is not present
+    expect(compiled.querySelector("strong + a")).not.toBeNull(); // strong should come before a
+  });
+
+  it("should render the tooManyTags translation without extra identifiers", () => {
+    component.translationKey = "tooManyTags";
+    fixture.detectChanges();
+    const compiled = fixture.debugElement.nativeElement;
+    expect(compiled.querySelector("p").textContent).toContain(
+      "First, Second, Third, Missing Fourth",
+    );
+
+    expect(mockLogService.warning).toHaveBeenCalledWith(
+      `The translation for "tooManyTags" has 4 template tag(s), but 3 bit-i18n-part directive(s) were found.`,
+    );
+
+    expect(compiled.querySelector("a").textContent).toContain("First");
+    expect(compiled.querySelector("strong").textContent).toContain("Second");
+    expect(compiled.querySelector("a > strong").textContent).toContain("Third");
+  });
+
+  it("should render the argsExample translation with the passed args", () => {
+    component.translationKey = "argsExample";
+    component.args = ["passed args"];
+    fixture.detectChanges();
+    const compiled = fixture.debugElement.nativeElement;
+    expect(compiled.querySelector("p").textContent).toContain(
+      "This is an example with link tags and passed args.",
+    );
+    expect(compiled.querySelector("a").textContent).toContain("link");
+  });
+});