Add getValueContentType()

packages/apidash_core/lib/extensions/map_extensions.dart

@@ -19,4 +19,8 @@ extension MapExtension on Map {
     }
     return null;
   }
+
+  String? getValueContentType() {
+    return this[getKeyContentType()];
+  }
 }

packages/apidash_core/test/extensions/map_extensions_test.dart

@@ -41,7 +41,7 @@ void main() {
         expect(mapEx.getKeyContentType(), "Content-Type");
       });
 
-      test('content-Type present should return true', () {
+      test('content-Type present', () {
         Map<String, String> mapEx = {"Agent": "Test", "content-Type": "x"};
         expect(mapEx.getKeyContentType(), "content-Type");
       });
@@ -72,4 +72,41 @@ void main() {
       });
     });
   });
+
+  group('Testing getValueContentType()', () {
+    test('Content-Type present', () {
+      Map<String, String> mapEx = {"Agent": "Test", "Content-Type": "x"};
+      expect(mapEx.getValueContentType(), "x");
+    });
+
+    test('content-Type present', () {
+      Map<String, String> mapEx = {"Agent": "Test", "content-Type": "x"};
+      expect(mapEx.getValueContentType(), "x");
+    });
+
+    test('empty should return null', () {
+      Map<String, String> mapEx = {};
+      expect(mapEx.getValueContentType(), null);
+    });
+
+    test('No content-type present should return null', () {
+      Map<String, String> mapEx = {"Agent": "Test"};
+      expect(mapEx.getValueContentType(), null);
+    });
+
+    test('Different datatype should return null', () {
+      Map mapEx = {1: "Test"};
+      expect(mapEx.getValueContentType(), null);
+    });
+
+    test('Mixed datatype but should return x', () {
+      Map mapEx = {1: "Test", "content-type": "x"};
+      expect(mapEx.getValueContentType(), "x");
+    });
+
+    test('Multiple occurence should return first', () {
+      Map mapEx = {1: "Test", "content-Type": "y", "content-type": "x"};
+      expect(mapEx.getValueContentType(), "y");
+    });
+  });
 }