Add org.apache.commons.lang3.SystemPropertiesTest.testGetPropertyStringSupplier()

Author: garydgregory

src/test/java/org/apache/commons/lang3/SystemPropertiesTest.java

@@ -24,11 +24,18 @@
 import static org.junit.jupiter.api.Assertions.assertNull;
 import static org.junit.jupiter.api.Assumptions.assumeTrue;
 
+import java.util.function.Supplier;
+
 import org.junit.jupiter.api.Test;
 import org.junit.jupiter.api.function.ThrowingSupplier;
+import org.junitpioneer.jupiter.SetSystemProperty;
+import org.junitpioneer.jupiter.SetSystemProperty.SetSystemProperties;
 
 class SystemPropertiesTest {
 
+    private static final String STRING_SPACE_1 = " ";
+    private static final String STRING_TAB_1 = "\t";
+
     private void basicKeyCheck(final String key) {
         assertNotNull(key);
         assertFalse(key.isEmpty());
@@ -695,6 +702,19 @@ void testGetPathSeparator() {
         assertNotNull(SystemProperties.getPathSeparator());
     }
 
+    @Test
+    @SetSystemProperties({ @SetSystemProperty(key = STRING_SPACE_1, value = "value1"), @SetSystemProperty(key = STRING_TAB_1, value = "value2") })
+    void testGetPropertyStringSupplier() {
+        assertNull(SystemProperties.getProperty(null, (Supplier<String>) null));
+        assertNull(SystemProperties.getProperty(StringUtils.EMPTY, (Supplier<String>) null));
+        assertEquals("value1", SystemProperties.getProperty(STRING_SPACE_1, (Supplier<String>) null));
+        assertEquals("value2", SystemProperties.getProperty("\t", (Supplier<String>) null));
+        assertEquals("x", SystemProperties.getProperty(null, () -> "x"));
+        assertEquals("x", SystemProperties.getProperty(StringUtils.EMPTY, () -> "x"));
+        assertEquals("value1", SystemProperties.getProperty(STRING_SPACE_1, () -> "v"));
+        assertEquals("value2", SystemProperties.getProperty("\t", () -> "v"));
+    }
+
     @Test
     void testGetUserCountry() {
         assertDoesNotThrow(SystemProperties::getUserCountry);