Update

Author: muukii

Sources/StructTransactionMacros/COWTrackingPropertyMacro.swift

@@ -111,7 +111,7 @@ extension COWTrackingPropertyMacro: AccessorMacro {
           $0.write(identifier: .init(name: "\(raw: propertyName)"))
         }
         if !isKnownUniquelyReferenced(&\(raw: backingName)) {
-          \(raw: backingName) = .init(\(raw: backingName).value)
+          \(raw: backingName) = .init(newValue)
         } else {
           \(raw: backingName).value = newValue
         }

Tests/StructTransactionTests/MyState.swift

@@ -2,6 +2,10 @@ import StructTransaction
 
 @Tracking
 struct MyState {
+  
+  init() {
+    self.name = ""
+  }
 
   var height: Int = 0
 

Tests/StructTransactionTests/Tests.swift

@@ -1,6 +1,45 @@
+import StructTransaction
 import Testing
 
 @Suite("Tests")
-enum Tests {
-   
+struct Tests {
+
+  @Test
+  func tracking_stored_property() {
+
+    var original = MyState.init()
+
+    let result = withTracking {
+      original.height = 100
+    }
+
+    #expect(result.writeIdentifiers.contains(.init(name: "height")))
+
+  }
+
+  @Test
+  func tracking_computed_property() {
+
+    let original = MyState.init()
+
+    let result = withTracking {
+      let _ = original.computedName
+    }
+
+    #expect(result.readIdentifiers.contains(.init(name: "name")))
+
+  }
+  
+  @Test
+  func cow() {
+    
+    let original = MyState.init()
+
+    var copy = original
+    
+    copy.height = 100
+    
+    #expect(copy.height == 100)
+    #expect(original.height == 0)
+  }
 }