DATAES-746 - Add store converters to convert binary data.

Original PR: #394

src/test/java/org/springframework/data/elasticsearch/core/convert/ElasticsearchCustomConversionsTest.java

@@ -0,0 +1,40 @@
+/*
+ * Copyright 2020 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.springframework.data.elasticsearch.core.convert;
+
+import static org.assertj.core.api.Assertions.*;
+
+import org.junit.jupiter.api.Test;
+import org.springframework.data.elasticsearch.core.convert.ElasticsearchCustomConversions.Base64ToByteArrayConverter;
+import org.springframework.data.elasticsearch.core.convert.ElasticsearchCustomConversions.ByteArrayToBase64Converter;
+
+/**
+ * @author Peter-Josef Meisch
+ */
+class ElasticsearchCustomConversionsTest {
+
+	private byte[] bytes = new byte[] { 0x01, 0x02, 0x03, 0x04 };
+	private String base64 = "AQIDBA==";
+
+	void shouldConvertFromByteArrayToBase64() {
+		assertThat(ByteArrayToBase64Converter.INSTANCE.convert(bytes)).isEqualTo(base64);
+	}
+
+	@Test
+	void shouldConvertFromStringToBase64() {
+		assertThat(Base64ToByteArrayConverter.INSTANCE.convert(base64)).isEqualTo(bytes);
+	}
+}