then:
        def e = thrown(ModelPath.InvalidNameException)
        e.message =~ "empty string"

        when:
        ModelPath.validateName("ü")

        then:
        e = thrown(ModelPath.InvalidNameException)
        e.message =~ "first character"

        when:
        ModelPath.validateName(" ")

        then:
        e = thrown(ModelPath.InvalidNameException)
        e.message =~ "first character"

    }

    public static class InvalidNameException extends GradleException {
        public InvalidNameException(String message) {
            super(message);
        }
    }

    @Contextual
    public static class InvalidPathException extends GradleException {
        public InvalidPathException(String message, InvalidNameException e) {
            super(message, e);
        }
    }

        """

        run taskName

        then:
        executed ":$taskName"

        when:
        ModelPath.validateName(taskName)

        then:
        thrown(ModelPath.InvalidNameException)
    }

    def "tasks are visible to rules using their public type"(){
        given:
        buildFile << """
tasks.create(name: 'taskContainerTask', type: DefaultTask) { }

task standardTask

Class <org.gradle.model.internal.core.ModelPath$Cache> is not annotated (directly or via its package) with @org.gradle.api.NonNullApi in (ModelPath.java:0)
Class <org.gradle.model.internal.core.ModelPath$InvalidNameException> is not annotated (directly or via its package) with @org.gradle.api.NonNullApi in (ModelPath.java:0)