package com.baiyue.common.web;

import feign.RequestInterceptor;
import org.junit.jupiter.api.Test;
import org.springframework.boot.autoconfigure.AutoConfigurations;
import org.springframework.boot.test.context.FilteredClassLoader;
import org.springframework.boot.test.context.runner.ApplicationContextRunner;

import static org.assertj.core.api.Assertions.assertThat;

class FeignTracePropagationAutoConfigurationTest {
    private final ApplicationContextRunner contextRunner = new ApplicationContextRunner()
            .withConfiguration(AutoConfigurations.of(FeignTracePropagationAutoConfiguration.class));

    @Test
    void registersTraceInterceptorWhenFeignIsPresent() {
        contextRunner.run(context -> {
            assertThat(context).hasSingleBean(FeignTraceRequestInterceptor.class);
            assertThat(context.getBeansOfType(RequestInterceptor.class)).hasSize(1);
        });
    }

    @Test
    void doesNotLoadFeignConfigurationWhenFeignIsAbsent() {
        contextRunner.withClassLoader(new FilteredClassLoader(RequestInterceptor.class))
                .run(context -> {
                    assertThat(context).hasNotFailed();
                    assertThat(context).doesNotHaveBean("feignTraceRequestInterceptor");
                });
    }

    @Test
    void backsOffOnlyForAnApplicationProvidedTraceInterceptor() {
        contextRunner.withBean(FeignTraceRequestInterceptor.class, FeignTraceRequestInterceptor::new)
                .run(context -> assertThat(context).hasSingleBean(FeignTraceRequestInterceptor.class));
    }
}