Minimal @Value test in Spring

Question

I'm new to Spring and struggling with its complexity and opaque documentation. My question is How does one write a minimal @Value test?

Consider this test module, in MinimalValueTest.java.

import org.junit.jupiter.api.Test; import org.springframework.beans.factory.annotation.Value; import org.springframework.stereotype.Component; import org.springframework.test.context.ActiveProfiles; @Component @ActiveProfiles("test") public class MinimalValueTest { @Value("${test.property}") public static String testProperty; @Test public void test() { if (testProperty == null) { System.out.println("*** FAILED ***"); } else { System.out.println("*** SUCCEEDED ***"); } // Unit tests will go here } }

This test references this property defined in the src/test/resources/application.properties file:

test.property=a_test_property

Running this outputs *** FAILED ***.

Extra credit: which Spring documentation best explains how to do this?

Make the testProperty non static, then it works. See baeldung.com/spring-inject-static-field and also what Sergey says below, annotate the test with @SpringBootTest — Rick
– Rick, Commented Feb 21, 2023 at 18:06

Sergey · Accepted Answer · 2023-02-21 18:06:27Z

1

You need to annotate your test class with @SpringBootTest instead of @Component

answered Feb 21, 2023 at 18:06

Sergey

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Comments

Arthur · Accepted Answer · 2023-02-21 19:49:17Z

This works:

import org.junit.jupiter.api.Assertions; import org.junit.jupiter.api.Test; import org.springframework.beans.factory.annotation.Value; import org.springframework.boot.test.context.SpringBootTest; import org.springframework.stereotype.Component; import org.springframework.test.context.ActiveProfiles; /** * This simple example uses an @Value annotation. */ @SpringBootTest @ActiveProfiles("test") public class MinimalValueTest { @Value("${test.property}") String testProperty; @Test public void test() { Assertions.assertTrue(testProperty != null); Assertions.assertEquals("a_test_property", testProperty); } }

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