Add unit tests for Core.Helpers.Expression

StabilityMatrix.Tests/Core/ExpressionsTests.cs

@@ -0,0 +1,41 @@
+using StabilityMatrix.Core.Helper;
+
+namespace StabilityMatrix.Tests.Core;
+
+[TestClass]
+public class ExpressionsTests
+{
+    private class TestClass
+    {
+        public int Id { get; set; }
+        public NestedTestClass? Nested { get; set; }
+    }
+    
+    private class NestedTestClass
+    {
+        public string Text { get; set; } = "";
+    }
+    
+    [TestMethod]
+    public void GetAssigner_Simple_PropertyName()
+    {
+        var (propertyName, _) =
+            Expressions.GetAssigner<TestClass, int>(x => x.Id);
+        
+        // Check that the property name is correct
+        Assert.AreEqual("Id", propertyName);
+    }
+    
+    [TestMethod]
+    public void GetAssigner_Simple_PropertyAssignment()
+    {
+        var obj = new TestClass();
+        
+        var (_, assigner) =
+            Expressions.GetAssigner<TestClass, int>(x => x.Id);
+        
+        assigner.Compile()(obj, 42);
+        
+        Assert.AreEqual(42, obj.Id);
+    }
+}