diff --git a/lib/extensions/string_extensions.dart b/lib/extensions/string_extensions.dart
index 824c47d5..37632a2f 100644
--- a/lib/extensions/string_extensions.dart
+++ b/lib/extensions/string_extensions.dart
@@ -1,5 +1,11 @@
 extension StringExtension on String {
   String capitalize() {
+    if (isEmpty) {
+      return this;
+    }
+    if (length == 1) {
+      return toUpperCase();
+    }
     return "${this[0].toUpperCase()}${substring(1).toLowerCase()}";
   }
 
diff --git a/lib/utils/convert_utils.dart b/lib/utils/convert_utils.dart
index c772134e..d0b2ac26 100644
--- a/lib/utils/convert_utils.dart
+++ b/lib/utils/convert_utils.dart
@@ -1,5 +1,6 @@
 import 'dart:typed_data';
 import 'dart:convert';
+import 'package:apidash/extensions/extensions.dart';
 import 'package:collection/collection.dart';
 import 'package:intl/intl.dart';
 import '../models/models.dart';
@@ -49,21 +50,9 @@ String audioPosition(Duration? duration) {
   return "$min:$secondsPadding$secs";
 }
 
-String capitalizeFirstLetter(String? text) {
-  if (text == null || text == "") {
-    return "";
-  } else if (text.length == 1) {
-    return text.toUpperCase();
-  } else {
-    var first = text[0];
-    var rest = text.substring(1);
-    return first.toUpperCase() + rest;
-  }
-}
-
 String formatHeaderCase(String text) {
   var sp = text.split("-");
-  sp = sp.map((e) => capitalizeFirstLetter(e)).toList();
+  sp = sp.map((e) => e.capitalize()).toList();
   return sp.join("-");
 }
 
diff --git a/pubspec.lock b/pubspec.lock
index b04f6a8e..12247062 100644
--- a/pubspec.lock
+++ b/pubspec.lock
@@ -1383,6 +1383,14 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "0.6.0"
+  test_cov_console:
+    dependency: "direct dev"
+    description:
+      name: test_cov_console
+      sha256: "73519e8be3689d73f5cffb652c12c310acacf48379396d834da937094836e65e"
+      url: "https://pub.dev"
+    source: hosted
+    version: "0.2.2"
   textwrap:
     dependency: transitive
     description:
diff --git a/pubspec.yaml b/pubspec.yaml
index 515fc0c9..93053652 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -89,6 +89,7 @@ dev_dependencies:
   freezed: ^2.5.2
   json_serializable: ^6.7.1
   spot: ^0.13.0
+  test_cov_console: ^0.2.2
 
 flutter:
   uses-material-design: true
diff --git a/test/extensions/widget_tester_extensions.dart b/test/extensions/widget_tester_extensions.dart
index e9c5adbd..d17c26e5 100644
--- a/test/extensions/widget_tester_extensions.dart
+++ b/test/extensions/widget_tester_extensions.dart
@@ -1,15 +1,6 @@
 import 'dart:ui';
 import 'package:flutter_test/flutter_test.dart';
-
-class ScreenSize {
-  const ScreenSize(this.name, this.width, this.height, this.pixelDensity);
-  final String name;
-  final double width, height, pixelDensity;
-}
-
-const compactWidthDevice = ScreenSize('compact__width_device', 500, 600, 1);
-const mediumWidthDevice = ScreenSize('medium__width_device', 800, 800, 1);
-const largeWidthDevice = ScreenSize('large_width_device', 1300, 800, 1);
+import '../test_consts.dart';
 
 extension ScreenSizeManager on WidgetTester {
   Future<void> setScreenSize(ScreenSize screenSize) async {
diff --git a/test/test_consts.dart b/test/test_consts.dart
index 6ef47887..cbd951d0 100644
--- a/test/test_consts.dart
+++ b/test/test_consts.dart
@@ -1,6 +1,16 @@
 import 'package:flutter/foundation.dart';
 import 'package:flutter/material.dart';
 
+class ScreenSize {
+  const ScreenSize(this.name, this.width, this.height, this.pixelDensity);
+  final String name;
+  final double width, height, pixelDensity;
+}
+
+const compactWidthDevice = ScreenSize('compact__width_device', 500, 600, 1);
+const mediumWidthDevice = ScreenSize('medium__width_device', 800, 800, 1);
+const largeWidthDevice = ScreenSize('large_width_device', 1300, 800, 1);
+
 final kThemeDataDark = ThemeData(
   useMaterial3: true,
   colorSchemeSeed: Colors.blue,
diff --git a/test/utils/convert_utils_test.dart b/test/utils/convert_utils_test.dart
index e996c319..ab853bfe 100644
--- a/test/utils/convert_utils_test.dart
+++ b/test/utils/convert_utils_test.dart
@@ -5,6 +5,58 @@ import 'package:apidash/models/name_value_model.dart';
 import 'package:apidash/models/form_data_model.dart';
 
 void main() {
+  group("Testing humanizeDate function", () {
+    test('Testing using date1', () {
+      DateTime date1 = DateTime(2024, 12, 31);
+      String date1Expected = "December 31, 2024";
+      expect(humanizeDate(date1), date1Expected);
+    });
+
+    test('Testing using date2', () {
+      DateTime date2 = DateTime(2024, 1, 1);
+      String date2Expected = "January 1, 2024";
+      expect(humanizeDate(date2), date2Expected);
+    });
+
+    test('Testing using date3', () {
+      DateTime date3 = DateTime(2024, 6, 15);
+      String date3Expected = "June 15, 2024";
+      expect(humanizeDate(date3), date3Expected);
+    });
+
+    test('Testing using date4', () {
+      DateTime date4 = DateTime(2024, 9, 30);
+      String date4Expected = "September 30, 2024";
+      expect(humanizeDate(date4), date4Expected);
+    });
+  });
+
+  group("Testing humanizeTime function", () {
+    test('Testing using time1', () {
+      DateTime time1 = DateTime(2024, 12, 31, 23, 59, 59);
+      String time1Expected = "11:59:59 PM";
+      expect(humanizeTime(time1), time1Expected);
+    });
+
+    test('Testing using time2', () {
+      DateTime time2 = DateTime(2024, 1, 1, 0, 0, 0);
+      String time2Expected = "12:00:00 AM";
+      expect(humanizeTime(time2), time2Expected);
+    });
+
+    test('Testing using time3', () {
+      DateTime time3 = DateTime(2024, 6, 15, 12, 0, 0);
+      String time3Expected = "12:00:00 PM";
+      expect(humanizeTime(time3), time3Expected);
+    });
+
+    test('Testing using time4', () {
+      DateTime time4 = DateTime(2024, 9, 30, 15, 30, 45);
+      String time4Expected = "03:30:45 PM";
+      expect(humanizeTime(time4), time4Expected);
+    });
+  });
+
   group("Testing humanizeDuration function", () {
     test('Testing using dur1', () {
       Duration dur1 = const Duration(minutes: 1, seconds: 3);
@@ -31,32 +83,6 @@ void main() {
     });
   });
 
-  group("Testing capitalizeFirstLetter function", () {
-    test('Testing using text1', () {
-      String text1 = "";
-      String text1Expected = "";
-      expect(capitalizeFirstLetter(text1), text1Expected);
-    });
-
-    test('Testing using text2', () {
-      String text2 = "a";
-      String text2Expected = "A";
-      expect(capitalizeFirstLetter(text2), text2Expected);
-    });
-
-    test('Testing using text3', () {
-      String text3 = "world";
-      String text3Expected = "World";
-      expect(capitalizeFirstLetter(text3), text3Expected);
-    });
-
-    test('Testing using text4', () {
-      String text4 = "worldly affairs";
-      String text4Expected = "Worldly affairs";
-      expect(capitalizeFirstLetter(text4), text4Expected);
-    });
-  });
-
   group("Testing formatHeaderCase function", () {
     test('Testing using headerText1', () {
       String headerText1 = "content-type";