refactor(components): replace Summary component with PostPreview

* rename component to PostPreview because Summary is an HTML element
and it could lead to confusion
* replace `title` and `titleLevel` with `heading` and `headingLvl`
because `title` is a native attribute
* rename `intro` prop to `excerpt`
* extract `cover` from `meta` prop
* rewrite meta type
* extract meta logic into a new component

1 files changed, 31 insertions, 0 deletions

diff --git a/src/utils/helpers/reading-time.test.ts b/src/utils/helpers/reading-time.test.ts
new file mode 100644
index 0000000..24181a6
--- /dev/null
+++ b/src/utils/helpers/reading-time.test.ts
@@ -0,0 +1,31 @@
+import { describe, it } from '@jest/globals';
+import { getReadingTimeFrom } from './reading-time';
+
+describe('reading-time', () => {
+  it('can transform a words count into a reading time in minutes', () => {
+    const wordsCount = 250;
+
+    // With the default settings, 250 words should be rounded to one minute.
+    expect(getReadingTimeFrom(wordsCount).inMinutes()).toBe(1);
+  });
+
+  it('can transform a words count into a reading time in minutes and seconds', () => {
+    const wordsCount = 1200;
+    const readingTime = getReadingTimeFrom(wordsCount).inMinutesAndSeconds();
+
+    expect(readingTime.minutes).toBeGreaterThan(1);
+    expect(readingTime.seconds).toBeGreaterThan(0);
+  });
+
+  it('can use a custom words per minute setting', () => {
+    const wordsCount = 100;
+    const wordsPerMinute = 100;
+    const readingTime = getReadingTimeFrom(
+      wordsCount,
+      wordsPerMinute
+    ).inMinutesAndSeconds();
+
+    expect(readingTime.minutes).toBe(1);
+    expect(readingTime.seconds).toBe(0);
+  });
+});