Fix incorrect test and simplify two ternary operators.

Generator/Source/CuckooGeneratorFramework/Tokens/InstanceVariable.swift

@@ -31,7 +31,7 @@ public struct InstanceVariable: Token, HasAccessibility {
 
     public func serialize() -> [String : Any] {
         let readOnlyString = readOnly ? "ReadOnly" : ""
-        let optionalString = type.isOptional ? (readOnly ? "" : "Optional") : ""
+        let optionalString = type.isOptional && !readOnly ? "Optional" : ""
         return [
             "name": name,
             "type": type.sugarized,

Tests/GenericProtocolTest.swift

@@ -90,6 +90,8 @@ class GenericProtocolTest: XCTestCase {
             when(mock.readOnlyPropertyC.get).thenReturn(MockTestedClass())
         }
 
+        _ = mock.readOnlyPropertyC
+
         verify(mock).readOnlyPropertyC.get()
     }