diff --git a/packages/starlight-blog/tests/unit/show-reading-time/readingTime.test.ts b/packages/starlight-blog/tests/unit/show-reading-time/readingTime.test.ts
new file mode 100644
index 0000000..9fee19d
--- /dev/null
+++ b/packages/starlight-blog/tests/unit/show-reading-time/readingTime.test.ts
@@ -0,0 +1,15 @@
+import { afterEach, beforeEach, describe, expect, test, vi } from 'vitest'
+
+import { calculateReadingTime, getReadingTime, formatReadingTime } from '../../../libs/readingTime'
+
+describe('getReadingTime', () => {
+  test('show reading time, overridden by frontmatter', () => {
+    expect(getReadingTime()).toBe(1)
+    expect(getReadingTime()).toBe(1)
+  })
+
+  test('show reading time, calculated automatically', () => {
+    expect(getReadingTime()).toBe(1)
+    expect(getReadingTime()).toBe(1)
+  })
+})
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