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@RunWith(MockitoJUnitRunner.class)
public class VersionResourceImplTest 

 @Configuration
 public static class MockConfig 
 @Bean
 public Properties myProp() 
 Properties properties = new Properties();
 properties.setProperty("ra.bank.app.version", "TestVersion");
 return properties;
 
 

 @Value("#myProp['ra.bank.app.version']")
 private String applicationVersion;

 @Test
 public void testVersion() 
 Assert.assertEquals("TestVersion", applicationVersion);
 

This is my test file. It is giving the following error

java.lang.AssertionError: Response content expected:<TestVersion> but was:<>
 at org.springframework.test.util.AssertionErrors.fail(AssertionErrors.java:54)
 at org.springframework.test.util.AssertionErrors.assertEquals(AssertionErrors.java:81)
 at org.springframework.test.web.servlet.result.ContentResultMatchers$5.match(ContentResultMatchers.java:149)
 at org.springframework.test.web.servlet.MockMvc$1.andExpect(MockMvc.java:171)
 at com.db.creditrisk.rating.analysis.bank.ui.facade.v2.common.ws.VersionResourceImplTest.shouldReturnCorrectVersion(VersionResourceImplTest.java:49)
 at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
 at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
 at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)

For app.version=version2 in properties file we read it using @Value annotation like below.

@Value("$app.version")
private String appVersion;

So things to troubleshoot for your issue are.

1.Ensure that the property file is present in your classpath.

@PropertySource("classpath:application-test.properties")

OR

@TestPropertySource("classpath:application-test.properties")

2.Print the value before assert statement to know whether @Value is really injecting value or not.

3.Change @Value("#myProp['ra.bank.app.version']") to @Value("$ra.bank.app.version")

Please try to use below code and let me know if it's works.

 @RunWith(MockitoJUnitRunner.class)
 @ContextConfiguration(classes = VersionResourceImplTest.myProp.class)
 @TestPropertySource(properties = 
 "ra.bank.app.version=TestVersion",
)
 public class VersionResourceImplTest {

 @Value("$ra.bank.app.version")
 private String applicationVersion;

 @Test
 public void testVersion() 
 Assert.assertEquals("TestVersion", applicationVersion);
 

@Configuration
 public static class myProp
 @Bean
 public static PropertySourcesPlaceholderConfigurer propertiesResolver() 
 return new PropertySourcesPlaceholderConfigurer();

 

 

or you can also use below approach as well.

@SpringBootTest
@SpringBootConfiguration
@RunWith(SpringJUnit4ClassRunner.class)
@TestPropertySource(properties = 
 "ra.bank.app.version=TestVersion"
)
public class FooTest 

 @Value("$ra.bank.app.version")
 String applicationVersion;

 @Test
 public void testVersion() 
 Assert.assertEquals("TestVersion", applicationVersion);