import org.junit.jupiter.api.Test;
import org.mockito.Mockito;
import org.springframework.boot.autoconfigure.logging.ConditionEvaluationReportLoggingListener;
import org.springframework.boot.test.context.runner.ApplicationContextRunner;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

import static org.assertj.core.api.Assertions.assertThat;
import static org.junit.jupiter.api.Assertions.assertAll;

class SelectServiceBeanTest {

  private final ApplicationContextRunner contextRunner = new ApplicationContextRunner()
      .withInitializer(new ConditionEvaluationReportLoggingListener())  // to print out conditional config report to log
      .withUserConfiguration(TestConfig.class)                          // satisfy transitive dependencies of beans being tested
      .withUserConfiguration(LeftService.class, RightService.class);

  @Test
  void rightServiceIsAppliedProperly() {
    contextRunner
        .withPropertyValues("use-left-service=false")
        .run(context -> assertAll(
            () -> assertThat(context).hasSingleBean(RightService.class),
            () -> assertThat(context).doesNotHaveBean(LeftService.class)));
  }
  
  @Test
  void leftServiceIsAppliedProperly() {
    contextRunner
        .withPropertyValues("use-left-service=true")
        .run(context -> assertAll(
            () -> assertThat(context).hasSingleBean(LeftService.class),
            () -> assertThat(context).doesNotHaveBean(RightService.class)));
  }

  @Test
  void rightServiceIsAppliedByDefault() {
    contextRunner
        .run(context -> assertAll(
            () -> assertThat(context).hasSingleBean(RightService.class),
            () -> assertThat(context).doesNotHaveBean(LeftService.class)));
  }

  @Configuration    // this annotation is not required here as the class is explicitly mentioned in `withUserConfiguration` method
  protected static class TestConfig {
    @Bean
    public SomeThirdDependency someThirdDependency() {
      return Mockito.mock(SomeThirdDependency.class);   // this bean will be automatically autowired into tested beans
    }
  }
}