Evolution: Test that adding or removing weak/unowned is a resilient change

Author: slavapestov

validation-test/Evolution/Inputs/class_add_property_attribute.swift

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+public var count = 0
+
+public func getVersion() -> Int {
+#if BEFORE
+  return 0
+#else
+  return 1
+#endif
+}
+
+public class MathClass {
+  public init() {}
+}
+
+public class Attributed {
+  public init(x: MathClass, y: MathClass) {
+    self.x = x
+    self.y = y
+  }
+
+#if BEFORE
+  public var x: MathClass?
+  public var y: MathClass
+#else
+  public weak var x: MathClass?
+  public unowned var y: MathClass
+#endif
+}

validation-test/Evolution/Inputs/struct_add_property_attribute.swift

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+public var count = 0
+
+public func getVersion() -> Int {
+#if BEFORE
+  return 0
+#else
+  return 1
+#endif
+}
+
+public class MathClass {
+  public init() {}
+}
+
+public struct Attributed {
+  public init(x: MathClass, y: MathClass) {
+    self.x = x
+    self.y = y
+  }
+
+#if BEFORE
+  public var x: MathClass?
+  public var y: MathClass
+#else
+  public weak var x: MathClass?
+  public unowned var y: MathClass
+#endif
+}

validation-test/Evolution/test_class_add_property_attribute.swift

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+// RUN: %target-resilience-test
+// REQUIRES: executable_test
+
+import StdlibUnittest
+import class_add_property_attribute
+
+
+var AddPropertyAttribute = TestSuite("AddPropertyAttribute")
+
+AddPropertyAttribute.test("AddPropertyAttribute") {
+  do {
+    let x = MathClass()
+    let y = MathClass()
+
+    let a = Attributed(x: x, y: y)
+    expectTrue(x === a.x)
+    expectTrue(y === a.y)
+  }
+}
+
+runAllTests()

validation-test/Evolution/test_struct_add_property_attribute.swift

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+// RUN: %target-resilience-test
+// REQUIRES: executable_test
+
+import StdlibUnittest
+import struct_add_property_attribute
+
+
+var AddPropertyAttribute = TestSuite("AddPropertyAttribute")
+
+AddPropertyAttribute.test("AddPropertyAttribute") {
+  do {
+    let x = MathClass()
+    let y = MathClass()
+
+    let a = Attributed(x: x, y: y)
+    expectTrue(x === a.x)
+    expectTrue(y === a.y)
+  }
+}
+
+runAllTests()