basic unit test

packages/lib/preprocess/src/add-blank-lines.spec.cjs

@@ -0,0 +1,47 @@
+import { describe, it, expect } from 'vitest';
+import addBlankLines from '../src/add-blank-lines.cjs';
+
+describe('addBlankLines Preprocessor', () => {
+    it('should not add blank lines to standard markdown', () => {
+        const input = `# Hello, world!
+This is a test.`;
+        const expectedOutput = `# Hello, world!
+This is a test.`;
+
+        const result = addBlankLines.markup({ content: input, filename: 'test.md' });
+
+		expect(result.code).toBe(expectedOutput);
+	});
+
+	it('should add blank lines before and after each block content', () => {
+		const input = `# Hello, world!
+This is a test.
+\`\`\`sql orders
+SELECT * FROM orders
+\`\`\`
+
+{#each orders as order}
+1. {order.name}
+{/each}
+`;
+		const expectedOutput = `# Hello, world!
+This is a test.
+\`\`\`sql orders
+SELECT * FROM orders
+\`\`\`
+
+{#each orders as order}
+
+1. {order.name}
+
+{/each}
+`;
+
+		const result = addBlankLines.markup({ content: input, filename: 'test.md' });
+
+		console.log(input);
+		console.log(result.code);
+
+		expect(result.code).toBe(expectedOutput);
+	});
+});