1 files changed, 100 insertions, 0 deletions
diff --git a/tests/cache-files.test.ts b/tests/cache-files.test.ts
new file mode 100644
index 0000000..0dc740a
--- /dev/null
+++ b/tests/cache-files.test.ts
@@ -0,0 +1,100 @@
+import { test, expect, beforeEach, afterEach } from 'bun:test';
+import { calculateFileChecksum, ensureDir, cleanupDir } from '../scripts/cache/files';
+import { mkdir, rm, writeFile } from 'fs/promises';
+import { join } from 'path';
+import { tmpdir } from 'os';
+
+const testDir = join(tmpdir(), 'bun-test-cache');
+
+beforeEach(async () => {
+    await mkdir(testDir, { recursive: true });
+});
+
+afterEach(async () => {
+    await rm(testDir, { recursive: true, force: true });
+});
+
+test('calculateFileChecksum returns consistent hash for same content', async () => {
+    const filePath = join(testDir, 'test.txt');
+    await writeFile(filePath, 'Hello, World!');
+
+    const hash1 = await calculateFileChecksum(filePath);
+    const hash2 = await calculateFileChecksum(filePath);
+
+    expect(hash1).toBe(hash2);
+    expect(hash1).toHaveLength(64); // SHA256 produces 64 hex characters
+});
+
+test('calculateFileChecksum returns different hashes for different content', async () => {
+    const filePath1 = join(testDir, 'test1.txt');
+    const filePath2 = join(testDir, 'test2.txt');
+
+    await writeFile(filePath1, 'Hello, World!');
+    await writeFile(filePath2, 'Goodbye, World!');
+
+    const hash1 = await calculateFileChecksum(filePath1);
+    const hash2 = await calculateFileChecksum(filePath2);
+
+    expect(hash1).not.toBe(hash2);
+});
+
+test('calculateFileChecksum handles empty file', async () => {
+    const filePath = join(testDir, 'empty.txt');
+    await writeFile(filePath, '');
+
+    const hash = await calculateFileChecksum(filePath);
+    expect(hash).toHaveLength(64);
+});
+
+test('calculateFileChecksum handles larger file', async () => {
+    const filePath = join(testDir, 'large.txt');
+    const content = 'x'.repeat(11 * 1024 * 1024); // ~11MB (over 10MB threshold)
+    await writeFile(filePath, content);
+
+    const hash = await calculateFileChecksum(filePath);
+    expect(hash).toHaveLength(64);
+});
+
+test('ensureDir creates directory if it does not exist', async () => {
+    const newDir = join(testDir, 'new-directory');
+
+    await ensureDir(newDir);
+
+    // Check if directory exists by trying to create a file in it
+    await writeFile(join(newDir, 'test.txt'), 'test');
+    expect(true).toBe(true); // If we get here, directory exists
+});
+
+test('ensureDir does not error if directory already exists', async () => {
+    await ensureDir(testDir);
+    await ensureDir(testDir); // Should not throw
+
+    expect(true).toBe(true);
+});
+
+test('cleanupDir removes directory and all contents', async () => {
+    const subDir = join(testDir, 'subdir');
+    await mkdir(subDir);
+    await writeFile(join(subDir, 'file.txt'), 'content');
+    await writeFile(join(testDir, 'file2.txt'), 'content2');
+
+    await cleanupDir(testDir);
+
+    // Directory should be gone
+    let exists = true;
+    try {
+        await writeFile(join(testDir, 'test.txt'), 'test');
+    } catch {
+        exists = false;
+    }
+    expect(exists).toBe(false);
+});
+
+test('cleanupDir handles non-existent directory', async () => {
+    const nonExistent = join(testDir, 'does-not-exist');
+
+    // Should not throw
+    await cleanupDir(nonExistent);
+
+    expect(true).toBe(true);
+});