Added configurators

tests/HopFrame.Tests.Core/Helpers/ExpressionHelperTests.cs

@@ -0,0 +1,44 @@
+using System.Linq.Expressions;
+using HopFrame.Core.Helpers;
+
+namespace HopFrame.Tests.Core.Helpers;
+
+public class ExpressionHelperTests {
+
+    [Fact]
+    public void GetPropertyInfo_ReturnsPropertyInfo_WhenExpressionIsValid() {
+        Expression<Func<TestModel, int>> expr = x => x.Id;
+
+        var prop = ExpressionHelper.GetPropertyInfo(expr);
+
+        Assert.Equal(nameof(TestModel.Id), prop.Name);
+        Assert.Equal(typeof(int), prop.PropertyType);
+    }
+
+    [Fact]
+    public void GetPropertyInfo_Throws_WhenExpressionRefersToMethod() {
+        Expression<Func<TestModel, int>> expr = x => x.Method();
+
+        var ex = Assert.Throws<ArgumentException>(() => ExpressionHelper.GetPropertyInfo(expr));
+
+        Assert.Contains("refers to a method", ex.Message);
+    }
+
+    [Fact]
+    public void GetPropertyInfo_Throws_WhenExpressionRefersToField() {
+        Expression<Func<TestModel, int>> expr = x => x.FieldBacking;
+
+        var ex = Assert.Throws<ArgumentException>(() => ExpressionHelper.GetPropertyInfo(expr));
+
+        Assert.Contains("refers to a field", ex.Message);
+    }
+
+    [Fact]
+    public void GetPropertyInfo_Throws_WhenExpressionBodyIsNotMemberExpression() {
+        Expression<Func<TestModel, int>> expr = x => 5;
+
+        var ex = Assert.Throws<ArgumentException>(() => ExpressionHelper.GetPropertyInfo(expr));
+
+        Assert.Contains("refers to a method, not a property", ex.Message);
+    }
+}