test(reading-time): Unit tests for calculating reading time (#11116)

packages/docusaurus-plugin-content-blog/src/__tests__/readingTime.test.ts

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+/**
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+import {calculateReadingTime} from '../readingTime';
+
+describe('calculateReadingTime', () => {
+  it('calculates reading time for empty content', () => {
+    expect(calculateReadingTime('')).toBe(0);
+  });
+
+  it('calculates reading time for short content', () => {
+    const content = 'This is a short test content.';
+    expect(calculateReadingTime(content)).toBe(0.03);
+  });
+
+  it('calculates reading time for long content', () => {
+    const content = 'This is a test content. '.repeat(100);
+    expect(calculateReadingTime(content)).toBe(2.5);
+  });
+
+  it('respects custom words per minute', () => {
+    const content = 'This is a test content. '.repeat(100);
+    expect(calculateReadingTime(content, {wordsPerMinute: 100})).toBe(5);
+  });
+
+  it('handles content with special characters', () => {
+    const content = 'Hello! How are you? This is a test...';
+    expect(calculateReadingTime(content)).toBe(0.04);
+  });
+
+  it('handles content with multiple lines', () => {
+    const content = `This is line 1.
+    This is line 2.
+    This is line 3.`;
+    expect(calculateReadingTime(content)).toBe(0.06);
+  });
+
+  it('handles content with HTML tags', () => {
+    const content = '<p>This is a <strong>test</strong> content.</p>';
+    expect(calculateReadingTime(content)).toBe(0.025);
+  });
+
+  it('handles content with markdown', () => {
+    const content = '# Title\n\nThis is **bold** and *italic* text.';
+    expect(calculateReadingTime(content)).toBe(0.04);
+  });
+
+  it('handles CJK content', () => {
+    const content = '你好，世界！这是一段测试内容。';
+    expect(calculateReadingTime(content)).toBe(0.06);
+  });
+});