BAEL-5977 Code for the Throw Exception for Unexpected Input for Enum with Mapstruct article

mapstruct/src/test/java/com/baeldung/enums/LevelMapperUnitTest.java

@@ -0,0 +1,28 @@
+package com.baeldung.enums;
+
+import org.junit.jupiter.api.Test;
+import org.mapstruct.factory.Mappers;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertThrows;
+
+class LevelMapperUnitTest {
+
+    LevelMapper levelMapper = Mappers.getMapper(LevelMapper.class);
+
+    @Test
+    void givenHighInputLevel_WhenInputLevelToOutputLevel_ThenHighOutputLevel() {
+        assertEquals(OutputLevel.HIGH, levelMapper.inputLevelToOutputLevel(InputLevel.HIGH));
+    }
+
+    @Test
+    void givenMediumInputLevel_WhenInputLevelToOutputLevel_ThenThrows() {
+        assertThrows(IllegalArgumentException.class, () -> levelMapper.inputLevelToOutputLevel(InputLevel.MEDIUM));
+    }
+
+    @Test
+    void givenLowInputLevel_WhenInputLevelToOutputLevel_ThenLowOutputLevel() {
+        assertEquals(OutputLevel.LOW, levelMapper.inputLevelToOutputLevel(InputLevel.LOW));
+    }
+
+}