adds test about single discriminator serialization

Author: raffaeleflorio

bson/src/test/unit/org/bson/codecs/pojo/PojoCodecDiscriminatorTest.java

@@ -0,0 +1,50 @@
+/*
+ * Copyright 2008-present MongoDB, Inc.
+ *
+ * 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
+ *
+ *   http://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.bson.codecs.pojo;
+
+import org.bson.codecs.pojo.entities.DiscriminatorModel;
+import org.bson.codecs.pojo.entities.DiscriminatorWithGetterModel;
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.assertArrayEquals;
+
+public final class PojoCodecDiscriminatorTest extends PojoTestCase {
+
+    @Test
+    public void testDiscriminatorEncodedOnceWhenItIsAlsoAGetter() {
+        byte[] encodedDiscriminatorWithoutGetter = encode(
+                getCodec(DiscriminatorModel.class),
+                new DiscriminatorModel(),
+                false
+        ).toByteArray();
+        byte[] encodedDiscriminatorWithGetter = encode(
+                getCodec(DiscriminatorWithGetterModel.class),
+                new DiscriminatorWithGetterModel(),
+                false
+        ).toByteArray();
+        assertArrayEquals(encodedDiscriminatorWithoutGetter, encodedDiscriminatorWithGetter);
+    }
+
+    @Test
+    public void testDiscriminatorEncodingWhenItIsAlsoAGetter() {
+        encodesTo(
+                getCodec(DiscriminatorWithGetterModel.class),
+                new DiscriminatorWithGetterModel(),
+                "{discriminatorKey:'discriminatorValue'}"
+        );
+    }
+}

bson/src/test/unit/org/bson/codecs/pojo/entities/DiscriminatorModel.java

@@ -0,0 +1,31 @@
+/*
+ * Copyright 2008-present MongoDB, Inc.
+ *
+ * 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
+ *
+ *   http://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.bson.codecs.pojo.entities;
+
+import org.bson.codecs.pojo.annotations.BsonDiscriminator;
+
+@BsonDiscriminator(key = "discriminatorKey", value = "discriminatorValue")
+public class DiscriminatorModel {
+
+    public DiscriminatorModel() {
+    }
+
+    @Override
+    public String toString() {
+        return "DiscriminatorWithoutGetterModel{}";
+    }
+}

bson/src/test/unit/org/bson/codecs/pojo/entities/DiscriminatorWithGetterModel.java

@@ -0,0 +1,35 @@
+/*
+ * Copyright 2008-present MongoDB, Inc.
+ *
+ * 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
+ *
+ *   http://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.bson.codecs.pojo.entities;
+
+import org.bson.codecs.pojo.annotations.BsonDiscriminator;
+
+@BsonDiscriminator(key = "discriminatorKey", value = "discriminatorValue")
+public class DiscriminatorWithGetterModel {
+
+    public DiscriminatorWithGetterModel() {
+    }
+
+    public String getDiscriminatorKey() {
+        return "discriminatorValue";
+    }
+
+    @Override
+    public String toString() {
+        return "DiscriminatorWithGetterModel{}";
+    }
+}