docs: add example to inject a token (#53)

Author: timdeschryver

src/app/examples/10-inject-token-dependency.spec.ts

@@ -0,0 +1,16 @@
+import { render } from '@testing-library/angular';
+
+import { DataInjectedComponent, DATA } from './10-inject-token-dependency';
+
+test('injects data into the component', async () => {
+  const component = await render(DataInjectedComponent, {
+    providers: [
+      {
+        provide: DATA,
+        useValue: { text: 'Hello boys and girls' },
+      },
+    ],
+  });
+
+  expect(component.getByText(/Hello boys and girls/i)).toBeInTheDocument();
+});

src/app/examples/10-inject-token-dependency.ts

@@ -0,0 +1,13 @@
+import { Component, InjectionToken, Inject } from '@angular/core';
+
+export const DATA = new InjectionToken<{ text: string }>('Components Data');
+
+@Component({
+  selector: 'app-fixture',
+  template: `
+    {{ data.text }}
+  `,
+})
+export class DataInjectedComponent {
+  constructor(@Inject(DATA) public data: { text: string }) {}
+}