Add abstract JSON test and tests for Jackson2 and gson (#665)

Author: chingor13

google-http-client-gson/src/test/java/com/google/api/client/json/gson/GsonParserTest.java

@@ -0,0 +1,28 @@
+/**
+ * Copyright 2019 Google LLC
+ *
+ * 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 com.google.api.client.json.gson;
+
+import com.google.api.client.json.JsonFactory;
+import com.google.api.client.test.json.AbstractJsonParserTest;
+
+public class GsonParserTest extends AbstractJsonParserTest {
+
+  @Override
+  protected JsonFactory newJsonFactory() {
+    return new GsonFactory();
+  }
+}

google-http-client-jackson2/src/test/java/com/google/api/client/json/jackson2/JacksonParserTest.java

@@ -0,0 +1,28 @@
+/**
+ * Copyright 2019 Google LLC
+ *
+ * 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 com.google.api.client.json.jackson2;
+
+import com.google.api.client.json.JsonFactory;
+import com.google.api.client.test.json.AbstractJsonParserTest;
+
+public class JacksonParserTest extends AbstractJsonParserTest {
+
+  @Override
+  protected JsonFactory newJsonFactory() {
+    return new JacksonFactory();
+  }
+}

google-http-client-test/src/main/java/com/google/api/client/test/json/AbstractJsonParserTest.java

@@ -0,0 +1,59 @@
+/**
+ * Copyright 2019 Google LLC
+ *
+ * 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 com.google.api.client.test.json;
+
+import com.google.api.client.json.GenericJson;
+import com.google.api.client.json.JsonFactory;
+import com.google.api.client.json.JsonObjectParser;
+import java.io.ByteArrayInputStream;
+import java.io.IOException;
+import java.io.InputStream;
+import java.math.BigDecimal;
+import java.nio.charset.StandardCharsets;
+import junit.framework.TestCase;
+
+public abstract class AbstractJsonParserTest extends TestCase {
+
+  protected abstract JsonFactory newJsonFactory();
+
+  private static String TEST_JSON =
+      "{\"strValue\": \"bar\", \"intValue\": 123, \"boolValue\": false}";
+  private static String TEST_JSON_BIG_DECIMAL = "{\"bigDecimalValue\": 1559341956102}";
+
+  public void testParse_basic() throws IOException {
+    JsonObjectParser parser = new JsonObjectParser(newJsonFactory());
+    InputStream inputStream = new ByteArrayInputStream(TEST_JSON.getBytes(StandardCharsets.UTF_8));
+    GenericJson json = parser.parseAndClose(inputStream, StandardCharsets.UTF_8, GenericJson.class);
+
+    assertTrue(json.get("strValue") instanceof String);
+    assertEquals("bar", json.get("strValue"));
+    assertTrue(json.get("intValue") instanceof BigDecimal);
+    assertEquals(new BigDecimal(123), json.get("intValue"));
+    assertTrue(json.get("boolValue") instanceof Boolean);
+    assertEquals(Boolean.FALSE, json.get("boolValue"));
+  }
+
+  public void testParse_bigDecimal() throws IOException {
+    JsonObjectParser parser = new JsonObjectParser(newJsonFactory());
+    InputStream inputStream =
+        new ByteArrayInputStream(TEST_JSON_BIG_DECIMAL.getBytes(StandardCharsets.UTF_8));
+    GenericJson json = parser.parseAndClose(inputStream, StandardCharsets.UTF_8, GenericJson.class);
+
+    assertTrue(json.get("bigDecimalValue") instanceof BigDecimal);
+    assertEquals(new BigDecimal("1559341956102"), json.get("bigDecimalValue"));
+  }
+}