Cover the code with comprehensive unit tests

csharp/Platform.Reflection.Tests/DynamicExtensionsTests.cs

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+using System;
+using System.Collections.Generic;
+using Xunit;
+
+namespace Platform.Reflection.Tests
+{
+    public class DynamicExtensionsTests
+    {
+        private class TestClass
+        {
+            public int IntProperty { get; set; }
+            public string StringProperty { get; set; } = "test";
+            public bool BoolProperty { get; set; }
+        }
+
+        [Fact]
+        public void HasPropertyExistingPropertyTest()
+        {
+            var obj = new TestClass();
+            Assert.True(obj.HasProperty("IntProperty"));
+            Assert.True(obj.HasProperty("StringProperty"));
+            Assert.True(obj.HasProperty("BoolProperty"));
+        }
+
+        [Fact]
+        public void HasPropertyNonExistingPropertyTest()
+        {
+            var obj = new TestClass();
+            Assert.False(obj.HasProperty("NonExistentProperty"));
+            Assert.False(obj.HasProperty("AnotherMissingProperty"));
+        }
+
+        [Fact]
+        public void HasPropertyCaseSensitiveTest()
+        {
+            var obj = new TestClass();
+            Assert.True(obj.HasProperty("IntProperty"));
+            Assert.False(obj.HasProperty("intproperty"));
+            Assert.False(obj.HasProperty("INTPROPERTY"));
+            Assert.False(obj.HasProperty("intProperty"));
+        }
+
+        [Fact]
+        public void HasPropertyWithDictionaryTest()
+        {
+            var dictionary = new Dictionary<string, object>
+            {
+                { "Key1", "Value1" },
+                { "Key2", 42 },
+                { "Key3", true }
+            };
+
+            // The current implementation doesn't actually check if the object is a dictionary
+            // It checks if the type "is" IDictionary<string, object> which fails for Dictionary<string, object>
+            // So it will fall back to checking properties on the Dictionary type itself
+            object obj = dictionary;
+
+            // Dictionary<string, object> has properties like Keys, Values, Count, etc.
+            Assert.True(obj.HasProperty("Keys"));
+            Assert.True(obj.HasProperty("Values"));
+            Assert.True(obj.HasProperty("Count"));
+            Assert.False(obj.HasProperty("Key1")); // These are dictionary entries, not properties
+        }
+
+        [Fact]
+        public void HasPropertyWithEmptyDictionaryTest()
+        {
+            var dictionary = new Dictionary<string, object>();
+            object obj = dictionary;
+            // Same as above - it checks Dictionary type properties, not dictionary contents
+            Assert.True(obj.HasProperty("Count")); // Dictionary has Count property
+            Assert.False(obj.HasProperty("AnyKey")); // But not custom keys
+        }
+
+        [Fact]
+        public void HasPropertyWithNullPropertyNameTest()
+        {
+            var obj = new TestClass();
+            // The current implementation throws ArgumentNullException when propertyName is null
+            // because Type.GetProperty(null) throws
+            Assert.Throws<ArgumentNullException>(() => obj.HasProperty(null));
+        }
+
+        [Fact]
+        public void HasPropertyWithEmptyPropertyNameTest()
+        {
+            var obj = new TestClass();
+            Assert.False(obj.HasProperty(""));
+            Assert.False(obj.HasProperty(string.Empty));
+        }
+
+        [Fact]
+        public void HasPropertyWithSystemObjectTest()
+        {
+            var obj = new object();
+            // Object class has standard properties like GetType, ToString, etc.
+            Assert.False(obj.HasProperty("GetType")); // GetType is a method, not a property
+            Assert.False(obj.HasProperty("SomeProperty"));
+        }
+
+        [Fact]
+        public void HasPropertyWithBuiltInTypesTest()
+        {
+            var str = "test string";
+            object obj = str;
+            Assert.True(obj.HasProperty("Length")); // String has Length property
+            Assert.False(obj.HasProperty("Size"));
+
+            var array = new int[] { 1, 2, 3 };
+            obj = array;
+            Assert.True(obj.HasProperty("Length")); // Array has Length property
+            Assert.False(obj.HasProperty("Count"));
+        }
+
+        [Fact]
+        public void HasPropertyWithAnonymousObjectTest()
+        {
+            var obj = new { Name = "Test", Age = 25, IsActive = true };
+            Assert.True(obj.HasProperty("Name"));
+            Assert.True(obj.HasProperty("Age"));
+            Assert.True(obj.HasProperty("IsActive"));
+            Assert.False(obj.HasProperty("Height"));
+        }
+    }
+}

csharp/Platform.Reflection.Tests/FieldInfoExtensionsTests.cs

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+using System;
+using System.Reflection;
+using Xunit;
+
+namespace Platform.Reflection.Tests
+{
+    public class FieldInfoExtensionsTests
+    {
+        private static class TestClass
+        {
+            public static int StaticIntField = 42;
+            public static string StaticStringField = "test field";
+            public static bool StaticBoolField = true;
+            public static readonly DateTime StaticReadOnlyField = new DateTime(2023, 1, 1);
+        }
+
+        [Fact]
+        public void GetStaticValueIntFieldTest()
+        {
+            var fieldInfo = typeof(TestClass).GetField(nameof(TestClass.StaticIntField));
+            Assert.NotNull(fieldInfo);
+
+            var value = fieldInfo.GetStaticValue<int>();
+            Assert.Equal(42, value);
+        }
+
+        [Fact]
+        public void GetStaticValueStringFieldTest()
+        {
+            var fieldInfo = typeof(TestClass).GetField(nameof(TestClass.StaticStringField));
+            Assert.NotNull(fieldInfo);
+
+            var value = fieldInfo.GetStaticValue<string>();
+            Assert.Equal("test field", value);
+        }
+
+        [Fact]
+        public void GetStaticValueBoolFieldTest()
+        {
+            var fieldInfo = typeof(TestClass).GetField(nameof(TestClass.StaticBoolField));
+            Assert.NotNull(fieldInfo);
+
+            var value = fieldInfo.GetStaticValue<bool>();
+            Assert.True(value);
+        }
+
+        [Fact]
+        public void GetStaticValueObjectFieldTest()
+        {
+            var fieldInfo = typeof(TestClass).GetField(nameof(TestClass.StaticStringField));
+            Assert.NotNull(fieldInfo);
+
+            var value = fieldInfo.GetStaticValue<object>();
+            Assert.Equal("test field", value);
+        }
+
+        [Fact]
+        public void GetStaticValueReadOnlyFieldTest()
+        {
+            var fieldInfo = typeof(TestClass).GetField(nameof(TestClass.StaticReadOnlyField));
+            Assert.NotNull(fieldInfo);
+
+            var value = fieldInfo.GetStaticValue<DateTime>();
+            Assert.Equal(new DateTime(2023, 1, 1), value);
+        }
+
+        [Fact]
+        public void GetStaticValueWithFieldModificationTest()
+        {
+            var fieldInfo = typeof(TestClass).GetField(nameof(TestClass.StaticIntField));
+            Assert.NotNull(fieldInfo);
+
+            // Change the field value
+            TestClass.StaticIntField = 100;
+
+            var value = fieldInfo.GetStaticValue<int>();
+            Assert.Equal(100, value);
+
+            // Reset for other tests
+            TestClass.StaticIntField = 42;
+        }
+
+        [Fact]
+        public void GetStaticValueFromSystemTypeTest()
+        {
+            var fieldInfo = typeof(int).GetField("MaxValue");
+            Assert.NotNull(fieldInfo);
+
+            var value = fieldInfo.GetStaticValue<int>();
+            Assert.Equal(int.MaxValue, value);
+        }
+
+        [Fact]
+        public void GetStaticValueFromEnumTest()
+        {
+            var fieldInfo = typeof(DayOfWeek).GetField("Monday");
+            Assert.NotNull(fieldInfo);
+
+            var value = fieldInfo.GetStaticValue<DayOfWeek>();
+            Assert.Equal(DayOfWeek.Monday, value);
+        }
+    }
+}

csharp/Platform.Reflection.Tests/MethodInfoExtensionsTests.cs

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+using System;
+using System.Reflection;
+using Xunit;
+
+namespace Platform.Reflection.Tests
+{
+    public class MethodInfoExtensionsTests
+    {
+        private static class TestClass
+        {
+            public static void NoParametersMethod() { }
+            public static void OneParameterMethod(int parameter) { }
+            public static void TwoParametersMethod(int first, string second) { }
+            public static void ManyParametersMethod(int a, string b, bool c, double d) { }
+
+            public static int SimpleReturnMethod() => 42;
+        }
+
+        [Fact]
+        public void GetParameterTypesNoParametersTest()
+        {
+            var methodInfo = typeof(TestClass).GetMethod(nameof(TestClass.NoParametersMethod));
+            Assert.NotNull(methodInfo);
+
+            var parameterTypes = methodInfo.GetParameterTypes();
+            Assert.NotNull(parameterTypes);
+            Assert.Empty(parameterTypes);
+        }
+
+        [Fact]
+        public void GetParameterTypesOneParameterTest()
+        {
+            var methodInfo = typeof(TestClass).GetMethod(nameof(TestClass.OneParameterMethod));
+            Assert.NotNull(methodInfo);
+
+            var parameterTypes = methodInfo.GetParameterTypes();
+            Assert.NotNull(parameterTypes);
+            Assert.Single(parameterTypes);
+            Assert.Equal(typeof(int), parameterTypes[0]);
+        }
+
+        [Fact]
+        public void GetParameterTypesTwoParametersTest()
+        {
+            var methodInfo = typeof(TestClass).GetMethod(nameof(TestClass.TwoParametersMethod));
+            Assert.NotNull(methodInfo);
+
+            var parameterTypes = methodInfo.GetParameterTypes();
+            Assert.NotNull(parameterTypes);
+            Assert.Equal(2, parameterTypes.Length);
+            Assert.Equal(typeof(int), parameterTypes[0]);
+            Assert.Equal(typeof(string), parameterTypes[1]);
+        }
+
+        [Fact]
+        public void GetParameterTypesManyParametersTest()
+        {
+            var methodInfo = typeof(TestClass).GetMethod(nameof(TestClass.ManyParametersMethod));
+            Assert.NotNull(methodInfo);
+
+            var parameterTypes = methodInfo.GetParameterTypes();
+            Assert.NotNull(parameterTypes);
+            Assert.Equal(4, parameterTypes.Length);
+            Assert.Equal(typeof(int), parameterTypes[0]);
+            Assert.Equal(typeof(string), parameterTypes[1]);
+            Assert.Equal(typeof(bool), parameterTypes[2]);
+            Assert.Equal(typeof(double), parameterTypes[3]);
+        }
+
+        [Fact]
+        public void GetILBytesNotNullTest()
+        {
+            var methodInfo = typeof(TestClass).GetMethod(nameof(TestClass.SimpleReturnMethod));
+            Assert.NotNull(methodInfo);
+
+            var ilBytes = methodInfo.GetILBytes();
+            Assert.NotNull(ilBytes);
+            Assert.NotEmpty(ilBytes);
+        }
+
+        [Fact]
+        public void GetILBytesForLambdaTest()
+        {
+            var func = new Func<int>(() => 42);
+            var methodInfo = func.Method;
+
+            var ilBytes = methodInfo.GetILBytes();
+            Assert.NotNull(ilBytes);
+            Assert.NotEmpty(ilBytes);
+        }
+
+        [Fact]
+        public void GetParameterTypesForGenericMethodTest()
+        {
+            var method = typeof(Array).GetMethod("IndexOf", new[] { typeof(Array), typeof(object) });
+            Assert.NotNull(method);
+
+            var parameterTypes = method.GetParameterTypes();
+            Assert.NotNull(parameterTypes);
+            Assert.Equal(2, parameterTypes.Length);
+            Assert.Equal(typeof(Array), parameterTypes[0]);
+            Assert.Equal(typeof(object), parameterTypes[1]);
+        }
+    }
+}