ConfigurationsTests Class — spring-boot Architecture

Source Code

core/spring-boot/src/test/java/org/springframework/boot/context/annotation/ConfigurationsTests.java lines 45–143

class ConfigurationsTests {

	@Test
	@SuppressWarnings("NullAway") // Test null check
	void createWhenClassesIsNullShouldThrowException() {
		assertThatIllegalArgumentException().isThrownBy(() -> new TestConfigurations((Collection<Class<?>>) null))
			.withMessageContaining("'classes' must not be null");
	}

	@Test
	void createShouldSortClasses() {
		TestConfigurations configurations = new TestConfigurations(Sorter.instance, OutputStream.class,
				InputStream.class);
		assertThat(configurations.getClasses()).containsExactly(InputStream.class, OutputStream.class);
	}

	@Test
	void getClassesShouldMergeByClassAndSort() {
		Configurations c1 = new TestSortedConfigurations(OutputStream.class, InputStream.class);
		Configurations c2 = new TestConfigurations(Short.class);
		Configurations c3 = new TestSortedConfigurations(String.class, Integer.class);
		Configurations c4 = new TestConfigurations(Long.class, Byte.class);
		Class<?>[] classes = Configurations.getClasses(c1, c2, c3, c4);
		assertThat(classes).containsExactly(Short.class, Long.class, Byte.class, InputStream.class, Integer.class,
				OutputStream.class, String.class);
	}

	@Test
	void getBeanNameWhenNoFunctionReturnsNull() {
		Configurations configurations = new TestConfigurations(Short.class);
		assertThat(configurations.getBeanName(Short.class)).isNull();
	}

	@Test
	void getBeanNameWhenFunctionReturnsBeanName() {
		Configurations configurations = new TestConfigurations(Sorter.instance, List.of(Short.class), Class::getName);
		assertThat(configurations.getBeanName(Short.class)).isEqualTo(Short.class.getName());
	}

	@Order(Ordered.HIGHEST_PRECEDENCE)
	static class TestConfigurations extends Configurations {

		TestConfigurations(Class<?>... classes) {
			this(Arrays.asList(classes));
		}

		TestConfigurations(UnaryOperator<Collection<Class<?>>> sorter, Class<?>... classes) {
			this(sorter, Arrays.asList(classes), null);
		}

		TestConfigurations(UnaryOperator<Collection<Class<?>>> sorter, Collection<Class<?>> classes,
				@Nullable Function<Class<?>, String> beanNameGenerator) {
			super(sorter, classes, beanNameGenerator);
		}

		TestConfigurations(Collection<Class<?>> classes) {
			super(classes);
		}

		@Override
		protected Configurations merge(Set<Class<?>> mergedClasses) {
			return new TestConfigurations(mergedClasses);
		}

	}

	@Order(Ordered.LOWEST_PRECEDENCE)
	static class TestSortedConfigurations extends Configurations {

		protected TestSortedConfigurations(Class<?>... classes) {
			this(Arrays.asList(classes));
		}

		protected TestSortedConfigurations(Collection<Class<?>> classes) {
			super(Sorter.instance, classes, null);
		}

		@Override
		protected Configurations merge(Set<Class<?>> mergedClasses) {
			return new TestSortedConfigurations(mergedClasses);
		}

	}

	static class Sorter implements UnaryOperator<Collection<Class<?>>> {

		static final Sorter instance = new Sorter();

		@Override
		public Collection<Class<?>> apply(Collection<Class<?>> classes) {
			ArrayList<Class<?>> sorted = new ArrayList<>(classes);
			sorted.sort(Comparator.comparing(ClassUtils::getShortName));
			return sorted;

		}

	}

}