@RequestParam 中的单元测试占位符 defaultValue

Question

我正在尝试测试我的控制器，该控制器有一个带有 RequestParam 的处理程序，该处理程序配置了一个指向占位符的默认值：

@Controller     
public class AgeController {
    @GetMapping("/age")
    public String home(@RequestParam(name="current", defaultValue="${default.age}") Integer age) {
        return "age"+age;
    }
}

当我通过浏览器进行测试时，这可以正常工作，但是当我使用以下测试用例时，它会引发异常：

测试用例：

public class AgeControllerTest {
    AgeController controller
    MockMvc mockMvc;

    @Before 
    public void setUp() {
        ageController = new AgeController();
        mockMvc = MockMvcBuilders.standaloneSetup(controller).addPlaceholderValue("default.age", "10").build();
    }

    @Test
    public void test() {
        mockMvc.perform(get("/age")).andExpect(status().isOk());
    }

}

例外：

Caused by: java.lang.NumberFormatException: For input string: "${default.age}"
    at java.lang.NumberFormatException.forInputString(Unknown Source)
    at java.lang.Integer.parseInt(Unknown Source)
    at java.lang.Integer.valueOf(Unknown Source)
    at org.springframework.util.NumberUtils.parseNumber(NumberUtils.java:208)
    at org.springframework.beans.propertyeditors.CustomNumberEditor.setAsText(CustomNumberEditor.java:113)
    at org.springframework.beans.TypeConverterDelegate.doConvertTextValue(TypeConverterDelegate.java:468)
    at org.springframework.beans.TypeConverterDelegate.doConvertValue(TypeConverterDelegate.java:441)
    at org.springframework.beans.TypeConverterDelegate.convertIfNecessary(TypeConverterDelegate.java:199)
    at org.springframework.beans.TypeConverterDelegate.convertIfNecessary(TypeConverterDelegate.java:108)
    at org.springframework.beans.TypeConverterSupport.doConvert(TypeConverterSupport.java:64)
    at org.springframework.beans.TypeConverterSupport.convertIfNecessary(TypeConverterSupport.java:47)
    at org.springframework.validation.DataBinder.convertIfNecessary(DataBinder.java:713)
    at org.springframework.web.method.annotation.AbstractNamedValueMethodArgumentResolver.resolveArgument(AbstractNamedValueMethodArgumentResolver.java:120)

Answer 1

考虑使用@TestPropertySource。

@TestPropertySource(properties = {"default.age = 10"})
public class AgeControllerTest {
    ...
}