diff --git a/bunfig.toml b/bunfig.toml
new file mode 100644
index 00000000..37ff1f94
--- /dev/null
+++ b/bunfig.toml
@@ -0,0 +1,2 @@
+[test]
+preload = ["./src/__tests__/setup.ts"]
diff --git a/src/__tests__/setup.ts b/src/__tests__/setup.ts
new file mode 100644
index 00000000..2c9459e7
--- /dev/null
+++ b/src/__tests__/setup.ts
@@ -0,0 +1,17 @@
+import { mock } from 'bun:test';
+
+mock.module('react-native', () => {
+  return {
+    Platform: {
+      OS: 'ios',
+    },
+  };
+});
+
+mock.module('../i18n', () => {
+  return {
+    default: {
+      t: (key: string) => key,
+    },
+  };
+});
diff --git a/src/__tests__/utils.test.ts b/src/__tests__/utils.test.ts
new file mode 100644
index 00000000..1b648c25
--- /dev/null
+++ b/src/__tests__/utils.test.ts
@@ -0,0 +1,36 @@
+import { describe, expect, test, mock } from 'bun:test';
+
+mock.module('react-native', () => {
+  return {
+    Platform: {
+      OS: 'ios',
+    },
+  };
+});
+
+mock.module('../i18n', () => {
+  return {
+    default: {
+      t: (key: string) => key,
+    },
+  };
+});
+
+import { joinUrls } from '../utils';
+
+describe('joinUrls', () => {
+  test('returns undefined when fileName is not provided', () => {
+    expect(joinUrls(['example.com'])).toBeUndefined();
+  });
+
+  test('returns an empty array when paths is empty', () => {
+    expect(joinUrls([], 'file.txt')).toEqual([]);
+  });
+
+  test('maps over paths and prepends https:// with fileName', () => {
+    expect(joinUrls(['example.com', 'test.org'], 'file.txt')).toEqual([
+      'https://example.com/file.txt',
+      'https://test.org/file.txt',
+    ]);
+  });
+});