feat(xjx-serdes): add enum serialization support

.github/workflows/release.yml

@@ -24,8 +24,9 @@ jobs:
       - name: Commit bumped version
         uses: stefanzweifel/git-auto-commit-action@v5
         with:
-          commit_message: "Bump version to ${{ github.event.inputs.tag }}"
+          commit_message: "Prepare release version ${{ github.event.inputs.tag }}"
   publish:
+    name: "Publish"
     needs: [bump_version]
     runs-on: ubuntu-latest
     steps:

xjx-serdes/src/test/java/io/jonasg/xjx/serdes/serialize/EnumSerializationTest.java

@@ -0,0 +1,120 @@
+package io.jonasg.xjx.serdes.serialize;
+
+import io.jonasg.xjx.serdes.Tag;
+import io.jonasg.xjx.serdes.XjxSerdes;
+import org.assertj.core.api.Assertions;
+import org.junit.jupiter.api.Nested;
+import org.junit.jupiter.api.Test;
+
+public class EnumSerializationTest {
+
+
+    @Test
+    void mapToFieldOfTypeEnum_whenCharacterDataMatchesEnumConstantName() {
+        // given
+        var enumHolder = new EnumHolder(Unit.FAHRENHEIT, Unit.PERCENTAGE);
+
+        // when
+        String xml = new XjxSerdes().write(enumHolder);
+
+        // then
+        Assertions.assertThat(xml).isEqualTo("""
+                <WeatherData>
+                  <Day>
+                    <High>
+                      <Unit>FAHRENHEIT</Unit>
+                    </High>
+                    <Precipitation>
+                      <Unit>PERCENTAGE</Unit>
+                    </Precipitation>
+                  </Day>
+                </WeatherData>
+                """);
+    }
+
+    @Nested
+    class NullEnumFieldsShouldBeSerializedAsEmptyTag {
+
+        @Test
+        void withOnlyValue() {
+            // given
+            var enumHolder = new EnumHolder(null, Unit.PERCENTAGE);
+
+            // when
+            String xml = new XjxSerdes().write(enumHolder);
+
+            // then
+            Assertions.assertThat(xml).isEqualTo("""
+                    <WeatherData>
+                      <Day>
+                        <High>
+                          <Unit/>
+                        </High>
+                        <Precipitation>
+                          <Unit>PERCENTAGE</Unit>
+                        </Precipitation>
+                      </Day>
+                    </WeatherData>
+                    """);
+        }
+
+        @Test
+        void withValueAndAttribute() {
+            // given
+            var enumHolder = new EnumHolderWithAttr(null, "C", Unit.PERCENTAGE);
+
+            // when
+            String xml = new XjxSerdes().write(enumHolder);
+
+            // then
+            Assertions.assertThat(xml).isEqualTo("""
+                    <WeatherData>
+                      <Day>
+                        <High>
+                          <Unit abbr="C"/>
+                        </High>
+                        <Precipitation>
+                          <Unit>PERCENTAGE</Unit>
+                        </Precipitation>
+                      </Day>
+                    </WeatherData>
+                    """);
+        }
+    }
+
+    static class EnumHolder {
+
+        public EnumHolder(Unit dayHighUnit, Unit precipitationUnit) {
+            this.dayHighUnit = dayHighUnit;
+            this.precipitationUnit = precipitationUnit;
+        }
+
+        @Tag(path = "/WeatherData/Day/High/Unit")
+        Unit dayHighUnit;
+
+        @Tag(path = "/WeatherData/Day/Precipitation/Unit")
+        Unit precipitationUnit;
+    }
+
+    static class EnumHolderWithAttr {
+
+        public EnumHolderWithAttr(Unit dayHighUnit, String abbreviation, Unit precipitationUnit) {
+            this.dayHighUnit = dayHighUnit;
+            this.abbreviation = abbreviation;
+            this.precipitationUnit = precipitationUnit;
+        }
+
+        @Tag(path = "/WeatherData/Day/High/Unit")
+        Unit dayHighUnit;
+
+        @Tag(path = "/WeatherData/Day/High/Unit", attribute = "abbr")
+        String abbreviation;
+
+        @Tag(path = "/WeatherData/Day/Precipitation/Unit")
+        Unit precipitationUnit;
+    }
+
+    enum Unit {
+        FAHRENHEIT, PERCENTAGE
+    }
+}