Add compatibility tests for IndirectAttribute attribute and resetSource()

Author: jcmosc

Tests/OpenAttributeGraphCompatibilityTests/Attribute/Indirect/IndirectAttributeCompatibilityTests.swift

@@ -12,9 +12,24 @@ struct IndirectAttributeCompatibilityTests {
     func basic() {
         let source = Attribute(value: 0)
         let indirect = IndirectAttribute(source: source)
+        #expect(indirect.attribute.identifier == indirect.identifier)
         #expect(indirect.identifier != source.identifier)
         #expect(indirect.source.identifier == source.identifier)
         #expect(indirect.dependency == .init(rawValue: 0))
     }
+    
+    @Test
+    func resetSource() {
+        let source1 = Attribute(value: 0)
+        let indirect = IndirectAttribute(source: source1)
+        #expect(indirect.source.identifier == source1.identifier)
+        
+        let source2 = Attribute(value: 0)
+        indirect.source = source2
+        #expect(indirect.source.identifier == source2.identifier)
+        
+        indirect.resetSource()
+        #expect(indirect.source.identifier == source1.identifier)
+    }
 }
 #endif