如何解析具有 @TestPropertySource 值的属性占位符？

Question

我在测试中无法使用

@TestPropertySource

值解析占位符

这是 MRE：

import jakarta.annotation.PostConstruct;
import lombok.Getter;
import lombok.Setter;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.stereotype.Component;

import java.util.List;

@Component
@ConfigurationProperties(prefix = "my-app")
public class GatewayMeta {
    @Value("${server.port}")
    private String port;

    @Setter
    @Getter
    private List<Server> servers;

    @PostConstruct
    private void init() {
        if (servers == null) {
            servers = List.of("http://localhost:" + port);
        }
    }
}

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.context.annotation.Configuration;
import org.springframework.context.annotation.Import;
import org.springframework.context.support.PropertySourcesPlaceholderConfigurer;
import org.springframework.test.context.ContextConfiguration;
import org.springframework.test.context.TestPropertySource;
import org.springframework.test.context.junit.jupiter.SpringExtension;

import java.util.List;

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

@ExtendWith(SpringExtension.class)
@ContextConfiguration(classes = ServerPropertiesTest.ServerPropertiesTestConfig.class)
class ServerPropertiesTest {
    @Autowired
    ServerProperties serverProperties;
    @Test
    void ifNoServerSpecified_serversHasOneServerMatchingLocalhostServerPort() {
        List<String> servers = serverProperties.getServers();
        assertThat(servers).hasSize(1);
        String server = servers.get(0);
        assertThat(server).isEqualTo("http://localhost:8080");
    }

    @Configuration
    @EnableConfigurationProperties(ServerProperties.class)
    @Import(PropertySourcesPlaceholderConfigurer.class)
    @TestPropertySource(properties = "server.port=8080")
    static class ServerPropertiesTestConfig {
    }
}

Caused by: java.lang.IllegalArgumentException: Could not resolve placeholder 'server.port' in value "${server.port}"

我还尝试在

.properties

中指定一个

locations

文件（也许，

properties

只能丰富已有的属性？）

@TestPropertySource(locations = "classpath:application-test.properties",
        properties = "server.port=8080")

无论

*.properties

是否包含密钥，结果都是相同的。看来

PropertySourcesPlaceholderConfigurer

根本不关心我的

@TestPropertySource

我也尝试过这个：

    @Configuration
    @EnableConfigurationProperties(ServerProperties.class)
    @Import(PropertySourcesPlaceholderConfigurer.class)
    @PropertySource("classpath:application-test.properties") // has the property set to 8080
    @TestPropertySource(properties = "server.port=8000") // will it override?
    static class GatewayMetaTestConfig {
    }

也不例外，但是

@TestPropertySource

被完全忽略，并且其值不会覆盖

.properties

文件中指定的值

我需要导入一些 *PostProcessor（不是

@TestPropertySource

）的

other

PropertySourcesPlaceholderConfigurer

吗？

我访问了这些类似的帖子，但它们似乎没有帮助：1，2，3

我的错误是什么？

Answer 1

由于我不理解，

@TestProperySource

应该在你的测试类，而不是测试配置

此外，你不需要常规的

@PropertySource

，甚至，最让我惊讶的是，

PropertySourcesPlaceholderConfigurer

这是正确的版本：

@ExtendWith(SpringExtension.class)
@ContextConfiguration(classes = ServerPropertiesTest.ServerPropertiesTestConfig.class)
@TestPropertySource(properties = "server.port=8000")
class ServerPropertiesTest {
    @Autowired
    ServerProperties serverProperties;
    @Test
    void ifNoServerSpecified_serversHasOneServerMatchingLocalhostServerPort() {
        List<String> servers = serverProperties.getServers();
        assertThat(servers).hasSize(1);
        String server = servers.get(0);
        assertThat(server).isEqualTo("http://localhost:8080");
    }

    @Configuration
    @EnableConfigurationProperties(ServerProperties.class)
    static class ServerPropertiesTestConfig {
    }
}