🧪 Add tests for joinUrls logic in utils.ts (#521)

Adds unit tests and test suite configuration for testing src/utils.ts, achieving 100% test coverage for the joinUrls logic.

Co-authored-by: google-labs-jules[bot] <161369871+google-labs-jules[bot]@users.noreply.github.com>
Co-authored-by: sunnylqm <615282+sunnylqm@users.noreply.github.com>

Author: sunnylqm

bunfig.toml

@@ -0,0 +1,2 @@
+[test]
+preload = ["./src/__tests__/setup.ts"]

src/__tests__/setup.ts

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+import { mock } from 'bun:test';
+
+mock.module('react-native', () => {
+  return {
+    Platform: {
+      OS: 'ios',
+    },
+  };
+});
+
+mock.module('../i18n', () => {
+  return {
+    default: {
+      t: (key: string) => key,
+    },
+  };
+});

src/__tests__/utils.test.ts

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+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',
+    ]);
+  });
+});