🧪 Adds test for the result type

app/test/result.test.ts

@@ -0,0 +1,39 @@
+import { describe, it, expect } from 'vitest';
+import { Result } from '../src/lib/utilities';
+
+describe('Result', () => {
+  it('should create a success result correctly', () => {
+    const successValue = "Success value";
+    const result = Result.ok(successValue);
+
+    expect(result.isOk()).toBe(true);
+    expect(result.isErr()).toBe(false);
+    expect(result.inner).toBe(successValue);
+  });
+
+  it('should create an error result correctly', () => {
+    const errorMessage = "Error message";
+    const result = Result.err(errorMessage);
+
+    expect(result.isOk()).toBe(false);
+    expect(result.isErr()).toBe(true);
+    expect(result.inner).toBe(errorMessage);
+  });
+
+  it('should type guard success and error results correctly', () => {
+    const successResult = Result.ok(123);
+    const errorResult = Result.err("Error");
+
+    if (successResult.isOk()) {
+      expect(typeof successResult.inner).toBe('number');
+    } else {
+      throw new Error('Expected successResult to be ok');
+    }
+
+    if (errorResult.isErr()) {
+      expect(typeof errorResult.inner).toBe('string');
+    } else {
+      throw new Error('Expected errorResult to be fail');
+    }
+  });
+});