spring @value default value

Author: peijd

spring-properties/src/test/java/com/ripjava/spring/properties/valuewithdefaults/ValuesWithDefaultsAppTest.java

@@ -0,0 +1,70 @@
+package com.ripjava.spring.properties.valuewithdefaults;
+
+
+import com.ripjava.spring.properties.ConfigPropertiesDemoApplication;
+import com.ripjava.spring.properties.yaml.YamlConfigApplication;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.extension.ExtendWith;
+import org.springframework.beans.factory.annotation.Value;
+import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.test.context.TestPropertySource;
+import org.springframework.test.context.junit.jupiter.SpringExtension;
+import org.springframework.util.Assert;
+
+import java.util.Arrays;
+import java.util.List;
+import java.util.function.IntConsumer;
+import java.util.stream.Collectors;
+import java.util.stream.IntStream;
+import java.util.stream.Stream;
+
+import static org.junit.jupiter.api.Assertions.assertArrayEquals;
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+@ExtendWith(SpringExtension.class)
+@TestPropertySource(value = "classpath:valueswithdefaults.properties")
+@SpringBootTest(classes = ConfigPropertiesDemoApplication.class)
+public class ValuesWithDefaultsAppTest {
+    @Value("${some.key:my default value}")
+    private String stringWithDefaultValue;
+
+    @Value("${some.key:}")
+    private String stringWithBlankDefaultValue;
+
+    @Value("${some.key:true}")
+    private boolean booleanWithDefaultValue;
+
+    @Value("${some.key:42}")
+    private int intWithDefaultValue;
+
+    @Value("${some.key:one,two,three}")
+    private String[] stringArrayWithDefaults;
+
+    @Value("${some.key:1,2,3}")
+    private int[] intArrayWithDefaults;
+
+    @Value("#{systemProperties['some.key'] ?: 'my default system property value'}")
+    private String spelWithDefaultValue;
+
+
+    @Test
+    public void test_ValuesWithDefaults() {
+
+        assertEquals(stringWithDefaultValue, "my default value");
+        assertEquals(stringWithBlankDefaultValue, "");
+
+
+        assertTrue(booleanWithDefaultValue);
+        assertTrue(intWithDefaultValue == 42);
+
+        List<String> stringListValues = Arrays.asList("one", "two", "three");
+        assertArrayEquals(stringArrayWithDefaults, stringListValues.toArray());
+
+        List<Integer> intListValues = Arrays.asList(1, 2, 3);
+        assertEquals(IntStream.of(intArrayWithDefaults).boxed().collect(Collectors.toList()), intListValues);
+
+        assertEquals(spelWithDefaultValue, "my default system property value");
+    }
+
+}