def oldNullability = nullabilityOf(oldMethod)
            def newNullability = nullabilityOf(newMethod)

            if (oldNullability == Nullability.NON_NULL && newNullability == Nullability.NULLABLE) {
                errors << "From non-null returning to null returning breaking change"
            } else if (oldNullability == Nullability.NON_NULL && newNullability == Nullability.UNMARKED) {

                "Method com.example.Source.foo(java.lang.String): Parameter 0 nullability changed from non-nullable to nullable",
                "Constructor com.example.Source(java.lang.String): Parameter 0 nullability changed from non-nullable to nullable",
                "Method com.example.SourceKt.invoke(com.example.Source,java.lang.String): Parameter 1 nullability changed from non-nullable to nullable"
            )

                }
            """
        ) {
            assertHasNoError()
            assertHasWarnings(
                "Field finalField: Nullability changed from nullable to non-nullable",
                "Method com.example.Source.foo(java.lang.String): Return nullability changed from nullable to non-nullable"
            )
            assertHasNoInformation()
        }
    }

    @Test

                }
            """
        ) {
            assertHasNoError()
            assertHasWarnings(
                "Field finalField: Nullability changed from nullable to non-nullable",
                "Method com.example.Source.foo(java.lang.String): Return nullability changed from nullable to non-nullable"
            )
            assertHasNoInformation()
        }
    }

    @Test

Only enable checks for a project if all its dependencies have checks enabled, in order to avoid back-and-forth when refining the annotations.

Avoid writing the so-called `PolyNull` or `ParametricNull` methods (where nullability of the result depends on the nullability of the type argument).

        ) {
            assertHasNoError()
            assertHasWarnings(
                "Method com.example.Source.foo(java.lang.String): Return nullability changed from null-unmarked to non-nullable",
                "Method com.example.Source.baz(java.lang.String): Return nullability changed from null-unmarked to non-nullable",
            )
            assertHasNoInformation()
        }
    }

    @Test

/*/internal-android-performance-testing/build-android-libs
test-splits/
/gradle/verification-keyring.gpg

# Kotlin
# ------
.kotlin

# IDEA
# ----
!/.idea
/.idea/*
# Needed to track entry points and nullability annotations (see https://youtrack.jetbrains.com/issue/IDEA-354114 and https://youtrack.jetbrains.com/issue/IDEA-354115)
!/.idea/misc.xml
!/.idea/codeStyles
!/.idea/inspectionProfiles
!/.idea/icon.png
!/.idea/icon_dark.png

# JSR 305 annotations are for embedding nullability information.
-dontwarn javax.annotation.**

# Animal Sniffer compileOnly dependency to ensure APIs are compatible with older versions of Java.
-dontwarn org.codehaus.mojo.animal_sniffer.*

# OkHttp platform used only on JVM and when Conscrypt and other security providers are available.
# May be used with robolectric or deliberate use of Bouncy Castle on Android
-dontwarn okhttp3.internal.platform.**

            -->
            <property name="illegalPkgs" value="jdk.internal,com.beust,org.testng.collections"/>
            <!--
                We prefer org.jspecify for nullability annotations.
            -->
            <property name="illegalClasses" value="org.jetbrains.annotations.Nullable,org.jetbrains.annotations.NotNull"/>
        </module>

        <!-- Naming -->

testing/architecture-test/src/changes/accepted-changes/accepted-public-api-changes.json
testing/architecture-test/src/changes/archunit-store/internal-api-nullability.txt

# Core automation platform (core/configuration)
platforms/core-configuration/               @gradle/bt-cortex
testing/smoke-ide-test/                     @gradle/bt-cortex