test: Spacing config test

test/configuration/padding_spacing_test.dart

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+import 'package:flutter/material.dart';
+import 'package:flutter_bloc_advance/configuration/padding_spacing.dart';
+import 'package:flutter_test/flutter_test.dart'; 
+
+void main() {
+  group('Spacing', () {
+    group('Constant values', () {
+      test('Given constant values When accessed Then should return correct values', () {
+        // Given & When & Then
+        expect(Spacing.small, 8.0);
+        expect(Spacing.medium, 16.0);
+        expect(Spacing.large, 24.0);
+      });
+
+      test('Given form width constants When accessed Then should return correct values', () {
+        // Given & When & Then
+        expect(Spacing.formMaxWidthSmall, 200.0);
+        expect(Spacing.formMaxWidthMedium, 400.0);
+        expect(Spacing.formMaxWidthLarge, 600.0);
+        expect(Spacing.formMaxWidthXLarge, 800.0);
+      });
+    });
+
+    group('Height percentage calculations', () {
+      testWidgets('Given context When height percentage methods called Then should calculate correct values', 
+          (WidgetTester tester) async {
+        // Given
+        await tester.pumpWidget(MaterialApp(
+          home: Builder(
+            builder: (context) {
+              final height = MediaQuery.of(context).size.height;
+
+              // When & Then
+              expect(Spacing.heightPercentage10(context), height * 0.1);
+              expect(Spacing.heightPercentage50(context), height * 0.5);
+              expect(Spacing.heightPercentage100(context), height);
+
+              // Dynamic percentage test
+              expect(Spacing.heightPercentage(context, 0.15), height * 0.15);
+              return Container();
+            },
+          ),
+        ));
+      });
+
+      testWidgets('Given invalid context When height percentage methods called Then should throw exception', 
+          (WidgetTester tester) async {
+        // Given
+        BuildContext? invalidContext;
+
+        // When & Then
+        expect(() => Spacing.heightPercentage10(invalidContext!), throwsA(isA<TypeError>()));
+        expect(() => Spacing.heightPercentage(invalidContext!, 0.5), throwsA(isA<TypeError>()));
+      });
+    });
+
+    group('Width percentage calculations', () {
+      testWidgets('Given context When width percentage methods called Then should calculate correct values', 
+          (WidgetTester tester) async {
+        // Given
+        await tester.pumpWidget(MaterialApp(
+          home: Builder(
+            builder: (context) {
+              final width = MediaQuery.of(context).size.width;
+
+              // When & Then
+              expect(Spacing.widthPercentage10(context), width * 0.1);
+              expect(Spacing.widthPercentage50(context), width * 0.5);
+              expect(Spacing.widthPercentage100(context), width);
+
+              // Dynamic percentage test
+              expect(Spacing.widthPercentage(context, 0.15), width * 0.15);
+              return Container();
+            },
+          ),
+        ));
+      });
+
+      testWidgets('Given invalid context When width percentage methods called Then should throw exception', 
+          (WidgetTester tester) async {
+        // Given
+        BuildContext? invalidContext;
+
+        // When & Then
+        expect(() => Spacing.widthPercentage10(invalidContext!), throwsA(isA<TypeError>()));
+        expect(() => Spacing.widthPercentage(invalidContext!, 0.5), throwsA(isA<TypeError>()));
+      });
+    });
+  });
+}