Add support for element property

Treat element attributes and properties as equal, just like
appium-windows-driver.

Author: aristotelos

README.md

@@ -221,7 +221,7 @@ To enable easy switching from appium-windows-driver, there is a rudimentary impl
 | GET    | /session/{session id}/element/{element id}/selected            | Is Element Selected            | :white_check_mark:                 |
 | GET    | /session/{session id}/element/{element id}/displayed           | Is Element Displayed           | :white_check_mark: [^isdisplayed]  |
 | GET    | /session/{session id}/element/{element id}/attribute/{name}    | Get Element Attribute          | :white_check_mark: [^getattribute] |
-| GET    | /session/{session id}/element/{element id}/property/{name}     | Get Element Property           |                                    |
+| GET    | /session/{session id}/element/{element id}/property/{name}     | Get Element Property           | :white_check_mark:                 |
 | GET    | /session/{session id}/element/{element id}/css/{property name} | Get Element CSS Value          | N/A                                |
 | GET    | /session/{session id}/element/{element id}/text                | Get Element Text               | :white_check_mark:                 |
 | GET    | /session/{session id}/element/{element id}/name                | Get Element Tag Name           | :white_check_mark:                 |

src/FlaUI.WebDriver.UITests/ElementTests.cs

@@ -366,6 +366,20 @@ public void GetAttribute_TextBox_ReturnsValue(string attributeName, string expec
             Assert.That(value, Is.EqualTo(expectedValue));
         }
 
+        [TestCase(["ClassName", "TextBox"])]
+        [TestCase(["FrameworkId", "WPF"])]
+        [TestCase(["NonExistent", null])]
+        public void GetProperty_TextBox_ReturnsValue(string attributeName, string expectedValue)
+        {
+            var driverOptions = FlaUIDriverOptions.TestApp();
+            using var driver = new RemoteWebDriver(WebDriverFixture.WebDriverUrl, driverOptions);
+            var element = driver.FindElement(ExtendedBy.AccessibilityId("TextBox"));
+
+            var value = element.GetDomProperty(attributeName);
+
+            Assert.That(value, Is.EqualTo(expectedValue));
+        }
+
         [Test]
         public void GetAttribute_DesktopElement_ReturnsAttribute()
         {
@@ -395,5 +409,23 @@ public void GetAttribute_PatternProperty_ReturnsValue()
 
             Assert.That(value, Is.EqualTo("On"));
         }
+
+        [Test]
+        public void GetProperty_PatternProperty_ReturnsValue()
+        {
+            var driverOptions = FlaUIDriverOptions.TestApp();
+            using var driver = new RemoteWebDriver(WebDriverFixture.WebDriverUrl, driverOptions);
+            var element = driver.FindElement(ExtendedBy.AccessibilityId("SimpleCheckBox"));
+
+            var value = element.GetDomProperty("Toggle.ToggleState");
+
+            Assert.That(value, Is.EqualTo("Off"));
+
+            element.Click();
+
+            value = element.GetDomProperty("Toggle.ToggleState");
+
+            Assert.That(value, Is.EqualTo("On"));
+        }
     }
 }

src/FlaUI.WebDriver/Controllers/ElementController.cs

@@ -229,6 +229,7 @@ public async Task<ActionResult> ElementSendKeys([FromRoute] string sessionId, [F
         }
 
         [HttpGet("{elementId}/attribute/{attributeId}")]
+        [HttpGet("{elementId}/property/{attributeId}")]
         public async Task<ActionResult> GetAttribute([FromRoute] string sessionId, [FromRoute] string elementId, [FromRoute] string attributeId)
         {
             var session = GetSession(sessionId);