"Method com.example.Source.baz(): From non-null returning to null-unmarked returning breaking change.",
            )
            assertHasNoWarning()
            assertHasNoInformation()
        }
    }

    @Test
    fun `from null-unmarked returning to non-null returning is not breaking`() {

        checkBinaryCompatibleJava(
            v1 = """

                "Method com.example.Source.foo(): From non-null returning to null returning breaking change."
            )
            assertHasNoWarning()
            assertHasNoInformation()
        }
    }

    @Test
    fun `from null accepting to non-null accepting is breaking`() {

        checkNotBinaryCompatibleJava(
            v1 = """

            )
            assertHasWarnings(
                "Method com.example.Source.setSomeVar(java.lang.String): Parameter 0 nullability changed from non-nullable to nullable"
            )
            assertHasNoInformation()
        }
    }

    @Test
    fun `from null accepting to non-null accepting is breaking`() {

        checkNotBinaryCompatibleKotlin(
            v1 = """

            assertHasErrors(
                *reportedMembers.map {
                    added(it.first, it.second)
                }.toTypedArray()
            )
            assertHasNoWarning()
            assertHasNoInformation()
        }
    }

    @Test
    fun `existing public members made internal appear as removed`() {

        checkNotBinaryCompatibleKotlin(
            v1 = publicSource,

                "Method com.example.SourceKt.invoke(byte,int): Breaking Kotlin modifier change."
            )
            assertHasNoWarning()
            assertHasNoInformation()
        }
    }