1 files changed, 72 insertions, 0 deletions
diff --git a/packages/cli/src/ui/utils/formatters.test.ts b/packages/cli/src/ui/utils/formatters.test.ts
new file mode 100644
index 00000000..cb3d1324
--- /dev/null
+++ b/packages/cli/src/ui/utils/formatters.test.ts
@@ -0,0 +1,72 @@
+/**
+ * @license
+ * Copyright 2025 Google LLC
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+import { describe, it, expect } from 'vitest';
+import { formatDuration, formatMemoryUsage } from './formatters.js';
+
+describe('formatters', () => {
+  describe('formatMemoryUsage', () => {
+    it('should format bytes into KB', () => {
+      expect(formatMemoryUsage(12345)).toBe('12.1 KB');
+    });
+
+    it('should format bytes into MB', () => {
+      expect(formatMemoryUsage(12345678)).toBe('11.8 MB');
+    });
+
+    it('should format bytes into GB', () => {
+      expect(formatMemoryUsage(12345678901)).toBe('11.50 GB');
+    });
+  });
+
+  describe('formatDuration', () => {
+    it('should format milliseconds less than a second', () => {
+      expect(formatDuration(500)).toBe('500ms');
+    });
+
+    it('should format a duration of 0', () => {
+      expect(formatDuration(0)).toBe('0s');
+    });
+
+    it('should format an exact number of seconds', () => {
+      expect(formatDuration(5000)).toBe('5.0s');
+    });
+
+    it('should format a duration in seconds with one decimal place', () => {
+      expect(formatDuration(12345)).toBe('12.3s');
+    });
+
+    it('should format an exact number of minutes', () => {
+      expect(formatDuration(120000)).toBe('2m');
+    });
+
+    it('should format a duration in minutes and seconds', () => {
+      expect(formatDuration(123000)).toBe('2m 3s');
+    });
+
+    it('should format an exact number of hours', () => {
+      expect(formatDuration(3600000)).toBe('1h');
+    });
+
+    it('should format a duration in hours and seconds', () => {
+      expect(formatDuration(3605000)).toBe('1h 5s');
+    });
+
+    it('should format a duration in hours, minutes, and seconds', () => {
+      expect(formatDuration(3723000)).toBe('1h 2m 3s');
+    });
+
+    it('should handle large durations', () => {
+      expect(formatDuration(86400000 + 3600000 + 120000 + 1000)).toBe(
+        '25h 2m 1s',
+      );
+    });
+
+    it('should handle negative durations', () => {
+      expect(formatDuration(-100)).toBe('0s');
+    });
+  });
+});