[Serialization] Migrate all tests to new test infrastructure

plugins/kotlinx-serialization/testData/firMembers/abstractAndSealed.kt

@@ -48,4 +48,4 @@ fun testKinds(): String {
 
 fun box(): String {
     return testData(testKinds())
-}
+}

plugins/kotlinx-serialization/testData/firMembers/classWithGenericParameters.kt

@@ -20,4 +20,4 @@ fun box(): String {
     val decoded = Json.decodeFromString(serial, s)
     if (box.t != decoded.t || box.vs != decoded.vs) return "Incorrect deserialization"
     return "OK"
-}
+}

plugins/kotlinx-serialization/testData/firMembers/defaultProperties.kt

@@ -25,4 +25,4 @@ fun test(targetString: String): String {
 
 fun box(): String {
     return test("""{"ctor":1,"ctorDependent":2,"body":"x","bodyDependent":3}""")
-}
+}

plugins/kotlinx-serialization/testData/firMembers/enums.kt

@@ -42,4 +42,4 @@ fun testSerialization(previous: String): String {
 
 fun box(): String {
     return testSerialization(testSerializers())
-}
+}

plugins/kotlinx-serialization/testData/firMembers/inlineClasses.kt

@@ -16,4 +16,4 @@ fun box(): String {
     val s = Json.encodeToString(Holder.serializer(), Holder(Foo(42)))
     if (s != """{"f":42}""") return s
     return "OK"
-}
+}

plugins/kotlinx-serialization/testData/firMembers/multipleProperties.kt

@@ -23,4 +23,4 @@ fun test(targetString: String): String {
 
 fun box(): String {
     return test("""{"ctor":1,"body":"x"}""")
-}
+}

plugins/kotlinx-serialization/testData/firMembers/privatePropertiesSerialization.kt

@@ -34,4 +34,4 @@ fun test(targetString: String): String {
 
 fun box(): String {
     return test("""{"ctor":42,"body":"42"}""")
-}
+}

plugins/kotlinx-serialization/testData/firMembers/serializableObject.kt

@@ -12,4 +12,4 @@ fun box(): String {
     val decoded = Json.decodeFromString(FooBar.serializer(), encoded)
     if (decoded !== FooBar) return "Incorrect object instance"
     return "OK"
-}
+}