test: add streakParamsSchema user validation tests (JhaSourav07#854)

* test: add streakParamsSchema user validation tests

* fix: resolve validation test syntax issues

Author: Hasini2706

lib/validations.test.ts

@@ -51,16 +51,9 @@ describe('githubParamsSchema', () => {
     }
   });
 });
-describe('streakParamsSchema user validation', () => {
-  it('should pass when user is valid', () => {
-    const result = streakParamsSchema.safeParse({
-      user: 'octocat',
-    });
-
-    expect(result.success).toBe(true);
-  });
 
-  it('should fail when user is omitted', () => {
+describe('streakParamsSchema', () => {
+  it('should fail when user is missing', () => {
     const result = streakParamsSchema.safeParse({});
 
     expect(result.success).toBe(false);
@@ -69,7 +62,7 @@ describe('streakParamsSchema user validation', () => {
     }
   });
 
-  it('should fail when user is empty', () => {
+  it('should fail when user is empty string', () => {
     const result = streakParamsSchema.safeParse({
       user: '',
     });
@@ -80,6 +73,28 @@ describe('streakParamsSchema user validation', () => {
     }
   });
 
+  it('should succeed when user is a valid username', () => {
+    const result = streakParamsSchema.safeParse({
+      user: 'octocat',
+    });
+
+    expect(result.success).toBe(true);
+    if (result.success) {
+      expect(result.data.user).toBe('octocat');
+    }
+  });
+
+  it('should fail when user is whitespace-only input', () => {
+    const result = streakParamsSchema.safeParse({
+      user: '   ',
+    });
+
+    expect(result.success).toBe(false);
+    if (!result.success) {
+      expect(result.error.issues[0]?.message).toBe('Invalid GitHub username');
+    }
+  });
+
   it('should fail when user exceeds 39 characters', () => {
     const result = streakParamsSchema.safeParse({
       user: 'a'.repeat(40),