PropertySourcesPlaceholdersResolverTests Class — spring-boot Architecture

Source Code

core/spring-boot/src/test/java/org/springframework/boot/context/properties/bind/PropertySourcesPlaceholdersResolverTests.java lines 40–99

class PropertySourcesPlaceholdersResolverTests {

	private @Nullable PropertySourcesPlaceholdersResolver resolver;

	@Test
	@SuppressWarnings("NullAway") // Test null check
	void placeholderResolverIfEnvironmentNullShouldThrowException() {
		assertThatIllegalArgumentException()
			.isThrownBy(() -> new PropertySourcesPlaceholdersResolver((Environment) null))
			.withMessageContaining("'environment' must not be null");
	}

	@Test
	void resolveIfPlaceholderPresentResolvesProperty() {
		MutablePropertySources sources = getPropertySources();
		this.resolver = new PropertySourcesPlaceholdersResolver(sources);
		Object resolved = this.resolver.resolvePlaceholders("${FOO}");
		assertThat(resolved).isEqualTo("hello world");
	}

	@Test
	void resolveIfPlaceholderAbsentUsesDefault() {
		this.resolver = new PropertySourcesPlaceholdersResolver((PropertySources) null);
		Object resolved = this.resolver.resolvePlaceholders("${FOO:bar}");
		assertThat(resolved).isEqualTo("bar");
	}

	@Test
	void resolveIfPlaceholderAbsentAndNoDefaultUsesPlaceholder() {
		this.resolver = new PropertySourcesPlaceholdersResolver((PropertySources) null);
		Object resolved = this.resolver.resolvePlaceholders("${FOO}");
		assertThat(resolved).isEqualTo("${FOO}");
	}

	@Test
	void resolveIfHelperPresentShouldUseIt() {
		MutablePropertySources sources = getPropertySources();
		TestPropertyPlaceholderHelper helper = new TestPropertyPlaceholderHelper("$<", ">");
		this.resolver = new PropertySourcesPlaceholdersResolver(sources, helper);
		Object resolved = this.resolver.resolvePlaceholders("$<FOO>");
		assertThat(resolved).isEqualTo("hello world");
	}

	private MutablePropertySources getPropertySources() {
		MutablePropertySources sources = new MutablePropertySources();
		Map<String, Object> source = new HashMap<>();
		source.put("FOO", "hello world");
		sources.addFirst(new MapPropertySource("test", source));
		return sources;
	}

	static class TestPropertyPlaceholderHelper extends PropertyPlaceholderHelper {

		TestPropertyPlaceholderHelper(String placeholderPrefix, String placeholderSuffix) {
			super(placeholderPrefix, placeholderSuffix);
		}

	}

}