Add basic tests for major issues

app/__tests__/functions.test.ts

@@ -0,0 +1,24 @@
+import { selectFunctions, runFunction, availableFunctions, FunctionName } from '../functions';
+
+describe('Functions utility', () => {
+  it('selectFunctions returns meta definitions for provided function names', () => {
+    const names: FunctionName[] = ['searchWithBing', 'addMemory'];
+    const defs = selectFunctions(names);
+    expect(defs).toHaveLength(names.length);
+    // Ensure that the returned function definitions correspond to the requested names
+    const returnedNames = defs.map((d) => d.name);
+    names.forEach((n) => expect(returnedNames).toContain(n));
+  });
+
+  it('runFunction throws an error for unknown function name', async () => {
+    await expect(runFunction('unknown_function', {})).rejects.toThrow('Unknown function');
+  });
+
+  it('every entry in availableFunctions exposes meta and run', () => {
+    Object.entries(availableFunctions).forEach(([name, mod]) => {
+      expect(typeof mod.meta).toBe('object');
+      expect(mod.meta.name).toBe(name);
+      expect(typeof mod.run).toBe('function');
+    });
+  });
+});

app/utils/__tests__/utils.test.ts

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+import { pluralize } from '../pluralize';
+import { capitalize } from '../capitalize';
+
+describe('Utility functions', () => {
+  describe('pluralize', () => {
+    it('handles regular plurals', () => {
+      expect(pluralize('cat')).toBe('cats');
+      expect(pluralize('dog')).toBe('dogs');
+    });
+
+    it('adds "es" for s, sh, ch, x, z endings', () => {
+      expect(pluralize('bus')).toBe('buses');
+      expect(pluralize('box')).toBe('boxes');
+      expect(pluralize('church')).toBe('churches');
+    });
+
+    it('replaces y with ies when appropriate', () => {
+      expect(pluralize('country')).toBe('countries');
+      expect(pluralize('city')).toBe('cities');
+      // Should not replace when preceded by a vowel
+      expect(pluralize('day')).toBe('days');
+    });
+  });
+
+  describe('capitalize', () => {
+    it('capitalizes the first character of a string', () => {
+      expect(capitalize('hello')).toBe('Hello');
+    });
+
+    it('returns the same string when already capitalized', () => {
+      expect(capitalize('World')).toBe('World');
+    });
+
+    it('handles empty strings gracefully', () => {
+      expect(capitalize('')).toBe('');
+    });
+  });
+});