Add unit tests.

Signed-off-by: Youssef Aouichaoui <[email protected]>

Author: youssef3wi

src/test/java/org/springframework/data/elasticsearch/core/index/MappingBuilderUnitTests.java

@@ -1296,6 +1296,33 @@ void shouldUseCustomMappedNameMultiField() throws JSONException {
 		assertEquals(expected, mapping, true);
 	}
 
+	@Test // #2952
+	void shouldMapNullityParameters() throws JSONException {
+		// Given
+		String expected = """
+				{
+				  "properties" : {
+				    "_class" : {
+				      "type" : "keyword",
+				      "index" : false,
+				      "doc_values" : false
+				    },
+				    "empty-field" : {
+				      "type" : "keyword",
+				      "null_value" : "EMPTY",
+				      "fields" : { }
+				    }
+				  }
+				}
+				""";
+
+		// When
+		String result = getMappingBuilder().buildPropertyMapping(MultiFieldWithNullEmptyParameters.class);
+
+		// Then
+		assertEquals(expected, result, true);
+	}
+
 	// region entities
 
 	@Document(indexName = "ignore-above-index")
@@ -2570,5 +2597,11 @@ private static class MultiFieldMappedNameEntity {
 		@MultiField(mainField = @Field(type = FieldType.Text, mappedTypeName = "match_only_text"), otherFields = { @InnerField(suffix = "lower_case",
 				type = FieldType.Keyword, normalizer = "lower_case_normalizer", mappedTypeName = "constant_keyword") }) private String description;
 	}
+
+	private static class MultiFieldWithNullEmptyParameters {
+		@Nullable
+		@MultiField(mainField = @Field(name = "empty-field", type = FieldType.Keyword, nullValue = "EMPTY",
+				storeNullValue = true, storeEmptyValue = false)) private List<String> emptyField;
+	}
 	// endregion
 }

src/test/java/org/springframework/data/elasticsearch/core/index/ReactiveMappingBuilderUnitTests.java

@@ -18,10 +18,13 @@
 import static org.skyscreamer.jsonassert.JSONAssert.*;
 import static org.springframework.data.elasticsearch.annotations.FieldType.*;
 
+import org.springframework.data.elasticsearch.annotations.FieldType;
+import org.springframework.data.elasticsearch.annotations.MultiField;
 import reactor.core.publisher.Mono;
 import reactor.core.scheduler.Schedulers;
 
 import java.time.Instant;
+import java.util.List;
 
 import org.json.JSONException;
 import org.junit.jupiter.api.DisplayName;
@@ -78,6 +81,35 @@ void shouldWriteRuntimeFields() throws JSONException {
 
 		assertEquals(expected, mapping, true);
 	}
+	
+	@Test // #2952
+	void shouldMapNullityParameters() throws JSONException {
+		// Given
+		ReactiveMappingBuilder mappingBuilder = getReactiveMappingBuilder();
+		String expected = """
+				{
+				  "properties" : {
+				    "_class" : {
+				      "type" : "keyword",
+				      "index" : false,
+				      "doc_values" : false
+				    },
+				    "empty-field" : {
+				      "type" : "keyword",
+				      "null_value" : "EMPTY",
+				      "fields" : { }
+				    }
+				  }
+				}
+				""";
+		
+		// When
+		String result = Mono.defer(() -> mappingBuilder.buildReactivePropertyMapping(MultiFieldWithNullEmptyParameters.class))
+				.subscribeOn(Schedulers.parallel()).block();
+
+		// Then
+		assertEquals(expected, result, true);
+	}
 
 	// region entities
 	@Document(indexName = "runtime-fields")
@@ -88,5 +120,11 @@ private static class RuntimeFieldEntity {
 		@Field(type = Date, format = DateFormat.epoch_millis, name = "@timestamp")
 		@Nullable private Instant timestamp;
 	}
+
+	private static class MultiFieldWithNullEmptyParameters {
+		@Nullable
+		@MultiField(mainField = @Field(name = "empty-field", type = FieldType.Keyword, nullValue = "EMPTY",
+				storeNullValue = true, storeEmptyValue = false)) private List<String> emptyField;
+	}
 	// endregion
 }