diff --git a/test/unit/appium_lib_core_test.rb b/test/unit/appium_lib_core_test.rb
index 6e3df339..0b687244 100644
--- a/test/unit/appium_lib_core_test.rb
+++ b/test/unit/appium_lib_core_test.rb
@@ -82,7 +82,7 @@ def test_core_instance_variables
       assert_equal :xcuitest, @core.automation_name
     end
 
-    def test_core_instance_variables_with_appium_prefix
+    def test_core_instance_variables_with_appium_prefix_hash
       opts = {
         url: 'http://custom-host:8080/wd/hub.com',
         caps: {
@@ -100,6 +100,23 @@ def test_core_instance_variables_with_appium_prefix
       assert_equal :xcuitest, @core.automation_name
     end
 
+    def test_core_instance_variables_with_appium_prefix_string
+      opts = {
+        url: 'http://custom-host:8080/wd/hub.com',
+        caps: {
+          'platformName' => 'ios',
+          'appium:platformVersion' => '11.0',
+          'appium:deviceName' => 'iPhone Simulator',
+          'appium:automationName' => 'XCUITest',
+          'appium:app' => '/path/to/MyiOS.app'
+        }
+      }
+      @core = Appium::Core.for(opts)
+      assert_equal 'http://custom-host:8080/wd/hub.com', @core.custom_url
+
+      assert_equal :ios, @core.device
+      assert_equal :xcuitest, @core.automation_name
+    end
     def test_url_param
       opts = {
         url: 'http://custom-host:8080/wd/hub.com',
diff --git a/test/unit/driver_test.rb b/test/unit/driver_test.rb
index 69bc4eea..9bfae767 100644
--- a/test/unit/driver_test.rb
+++ b/test/unit/driver_test.rb
@@ -79,14 +79,13 @@ def test_verify_appium_core_base_capabilities_create_capabilities
       assert_equal 'someCapability2', caps[:someCapability2]
     end
 
-    def test_verify_appium_core_base_capabilities_create_capabilities_with_caps
+    def test_verify_appium_core_base_capabilities_create_capabilities_with_caps_hash
       caps = ::Appium::Core::Base::Capabilities.new(platformName: 'ios',
                                                     'appium:platformVersion': '11.4',
                                                     'appium:automationName': 'XCUITest',
                                                     'appium:app': 'test/functional/app/UICatalog.app.zip')
 
       caps_with_json = JSON.parse(caps.to_json)
-      puts(caps_with_json)
       assert_equal 'ios', caps_with_json['platformName']
       assert_equal 'XCUITest', caps_with_json['appium:automationName']
       assert_equal 'test/functional/app/UICatalog.app.zip', caps_with_json['appium:app']
@@ -96,6 +95,22 @@ def test_verify_appium_core_base_capabilities_create_capabilities_with_caps
       assert_equal 'test/functional/app/UICatalog.app.zip', caps[:'appium:app']
     end
 
+    def test_verify_appium_core_base_capabilities_create_capabilities_with_caps_string
+      caps = ::Appium::Core::Base::Capabilities.new('platformName' => 'ios',
+                                                    'appium:platformVersion' => '11.4',
+                                                    'appium:automationName' => 'XCUITest',
+                                                    'appium:app' => 'test/functional/app/UICatalog.app.zip')
+
+      caps_with_json = JSON.parse(caps.to_json)
+      assert_equal 'ios', caps_with_json['platformName']
+      assert_equal 'XCUITest', caps_with_json['appium:automationName']
+      assert_equal 'test/functional/app/UICatalog.app.zip', caps_with_json['appium:app']
+
+      assert_equal 'ios', caps['platformName']
+      assert_equal 'XCUITest', caps['appium:automationName']
+      assert_equal 'test/functional/app/UICatalog.app.zip', caps['appium:app']
+    end
+
     def test_default_wait
       assert_equal 5, @core.default_wait
     end