overriding properties section and changing article module

spring-boot-modules/spring-boot-testing/src/test/java/com/baeldung/boot/configurationproperties/BindingPropertiesToBeanMethodsUnitTest.java

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+package com.baeldung.boot.configurationproperties;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+import java.util.HashMap;
+import java.util.Map;
+
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.extension.ExtendWith;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.context.properties.EnableConfigurationProperties;
+import org.springframework.test.context.ContextConfiguration;
+import org.springframework.test.context.TestPropertySource;
+import org.springframework.test.context.junit.jupiter.SpringExtension;
+
+@ExtendWith(SpringExtension.class)
+@EnableConfigurationProperties(value = ServerConfig.class)
+@ContextConfiguration(classes = ServerConfigFactory.class)
+@TestPropertySource("classpath:server-config-test.properties")
+public class BindingPropertiesToBeanMethodsUnitTest {
+
+	@Autowired
+	private ServerConfigFactory configFactory;
+
+	@Test
+	void givenBeanAnnotatedMethod_whenBindingProperties_thenAllFieldsAreSet() {
+
+		assertEquals("192.168.0.2", configFactory.getDefaultConfigs().getAddress().getIp());
+
+		Map<String, String> expectedResourcesPath = new HashMap<>();
+		expectedResourcesPath.put("imgs", "/root/def/imgs");
+		assertEquals(expectedResourcesPath, configFactory.getDefaultConfigs().getResourcesPath());
+	}
+}

spring-boot-modules/spring-boot-testing/src/test/java/com/baeldung/boot/configurationproperties/BindingPropertiesToUserDefinedPOJOUnitTest.java

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+package com.baeldung.boot.configurationproperties;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+import java.util.HashMap;
+import java.util.Map;
+
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.extension.ExtendWith;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.context.properties.EnableConfigurationProperties;
+import org.springframework.test.context.TestPropertySource;
+import org.springframework.test.context.junit.jupiter.SpringExtension;
+
+@ExtendWith(SpringExtension.class)
+@EnableConfigurationProperties(value = ServerConfig.class)
+@TestPropertySource("classpath:server-config-test.properties")
+public class BindingPropertiesToUserDefinedPOJOUnitTest {
+
+	@Autowired
+	private ServerConfig serverConfig;
+
+	@Test
+	void givenUserDefinedPOJO_whenBindingPropertiesFile_thenAllFieldsAreSet() {
+
+		assertEquals("192.168.0.1", serverConfig.getAddress().getIp());
+
+		Map<String, String> expectedResourcesPath = new HashMap<>();
+		expectedResourcesPath.put("imgs", "/root/imgs");
+		assertEquals(expectedResourcesPath, serverConfig.getResourcesPath());
+	}
+}

spring-boot-modules/spring-boot-testing/src/test/java/com/baeldung/boot/configurationproperties/BindingYMLPropertiesUnitTest.java

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+package com.baeldung.boot.configurationproperties;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import java.util.HashMap;
+import java.util.Map;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.extension.ExtendWith;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.context.properties.EnableConfigurationProperties;
+import org.springframework.boot.test.context.ConfigFileApplicationContextInitializer;
+import org.springframework.test.context.ActiveProfiles;
+import org.springframework.test.context.ContextConfiguration;
+import org.springframework.test.context.junit.jupiter.SpringExtension;
+
+@ExtendWith(SpringExtension.class)
+@ContextConfiguration(initializers = ConfigFileApplicationContextInitializer.class)
+@EnableConfigurationProperties(value = ServerConfig.class)
+@ActiveProfiles("test")
+public class BindingYMLPropertiesUnitTest {
+
+	@Autowired
+	private ServerConfig serverConfig;
+
+	@Test
+	void whenBindingYMLConfigFile_thenAllFieldsAreSet() {
+
+		assertEquals("192.168.0.4", serverConfig.getAddress().getIp());
+
+		Map<String, String> expectedResourcesPath = new HashMap<>();
+		expectedResourcesPath.put("imgs", "/etc/test/imgs");
+		assertEquals(expectedResourcesPath, serverConfig.getResourcesPath());
+	}
+}

spring-boot-modules/spring-boot-testing/src/test/java/com/baeldung/boot/configurationproperties/OverridingConfigurationPropertiesUnitTest.java

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+package com.baeldung.boot.configurationproperties;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+import java.util.HashMap;
+import java.util.Map;
+
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.extension.ExtendWith;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.context.properties.EnableConfigurationProperties;
+import org.springframework.test.context.TestPropertySource;
+import org.springframework.test.context.junit.jupiter.SpringExtension;
+
+@ExtendWith(SpringExtension.class)
+@EnableConfigurationProperties(value = MailServer.class)
+@TestPropertySource(properties = { "validate.mail_config.address=new_user@test" })
+public class OverridingConfigurationPropertiesUnitTest {
+
+	@Autowired
+	private MailServer mailServer;
+
+	@Test
+	void givenUsingPropertiesAttribute_whenAssiginingNewValueToProprty_thenSpringUsesNewValue() {
+
+		assertEquals("new_user@test", mailServer.getMailConfig().getAddress());
+
+		Map<String, String> expectedMap = new HashMap<>();
+		expectedMap.put("first", "prop1");
+		expectedMap.put("second", "prop2");
+		assertEquals(expectedMap, mailServer.getPropertiesMap());
+	}
+}

spring-boot-modules/spring-boot-testing/src/test/java/com/baeldung/boot/configurationproperties/PropertyValidationUnitTest.java

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+package com.baeldung.boot.configurationproperties;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+import javax.validation.Validation;
+import javax.validation.Validator;
+
+import org.junit.jupiter.api.BeforeAll;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.extension.ExtendWith;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.context.properties.EnableConfigurationProperties;
+import org.springframework.test.context.TestPropertySource;
+import org.springframework.test.context.junit.jupiter.SpringExtension;
+
+@ExtendWith(SpringExtension.class)
+@EnableConfigurationProperties(value = MailServer.class)
+@TestPropertySource("classpath:property-validation-test.properties")
+public class PropertyValidationUnitTest {
+
+	@Autowired
+	private MailServer mailServer;
+
+	private static Validator propertyValidator;
+
+	@BeforeAll
+	public static void setup() {
+		propertyValidator = Validation.buildDefaultValidatorFactory().getValidator();
+	}
+
+	@Test
+	void whenBindingPropertiesToValidatedBeans_thenConstrainsAreChecked() {
+
+		assertEquals(0, propertyValidator.validate(mailServer.getPropertiesMap()).size());
+		assertEquals(0, propertyValidator.validate(mailServer.getMailConfig()).size());
+	}
+}

spring-boot-modules/spring-boot-testing/src/test/java/com/baeldung/boot/configurationproperties/SpringPropertiesConversionUnitTest.java

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+package com.baeldung.boot.configurationproperties;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+import java.time.Duration;
+
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.extension.ExtendWith;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.context.properties.EnableConfigurationProperties;
+import org.springframework.test.context.ContextConfiguration;
+import org.springframework.test.context.TestPropertySource;
+import org.springframework.test.context.junit.jupiter.SpringExtension;
+import org.springframework.util.unit.DataSize;
+
+@ExtendWith(SpringExtension.class)
+@EnableConfigurationProperties(value = PropertyConversion.class)
+@ContextConfiguration(classes = CustomCredentialsConverter.class)
+@TestPropertySource("classpath:spring-conversion-test.properties")
+public class SpringPropertiesConversionUnitTest {
+
+	@Autowired
+	private PropertyConversion propertyConversion;
+
+	@Test
+	void whenUsingSpringDefaultSizeConversion_thenDataSizeObjectIsSet() {
+
+		assertEquals(DataSize.ofMegabytes(500), propertyConversion.getUploadSpeed());
+		assertEquals(DataSize.ofGigabytes(10), propertyConversion.getDownloadSpeed());
+	}
+
+	@Test
+	void whenUsingSpringDefaultDurationConversion_thenDurationObjectIsSet() {
+
+		assertEquals(Duration.ofDays(1), propertyConversion.getBackupDay());
+		assertEquals(Duration.ofHours(8), propertyConversion.getBackupHour());
+	}
+
+	@Test
+	void whenRegisteringCustomCredentialsConverter_thenCredentialsAreParsed() {
+
+		assertEquals("user", propertyConversion.getCredentials().getUsername());
+		assertEquals("123", propertyConversion.getCredentials().getPassword());
+	}
+}