Revert Jackson version to 2.8.11 and add JacksonSerializer tests (Azu…

…re#336)

client-runtime/src/test/java/com/microsoft/rest/v2/serializer/JacksonAdapterTests.java

@@ -0,0 +1,58 @@
+package com.microsoft.rest.v2.serializer;
+
+import com.fasterxml.jackson.databind.JsonMappingException;
+import org.junit.Test;
+
+import java.io.IOException;
+import java.util.HashMap;
+import java.util.Map;
+
+import static org.junit.Assert.*;
+
+public class JacksonAdapterTests {
+    @Test
+    public void emptyMap() throws IOException {
+        final Map<String,String> map = new HashMap<>();
+        final JacksonAdapter serializer = new JacksonAdapter();
+        assertEquals("{}", serializer.serialize(map));
+    }
+
+    @Test
+    public void mapWithNullKey() {
+        final Map<String,String> map = new HashMap<>();
+        map.put(null, null);
+        final JacksonAdapter serializer = new JacksonAdapter();
+        try {
+            serializer.serialize(map);
+            fail();
+        }
+        catch (Exception e) {
+            assertEquals(JsonMappingException.class, e.getClass());
+            assertTrue(e.getMessage().contains("Null key for a Map not allowed in JSON"));
+        }
+    }
+
+    @Test
+    public void mapWithEmptyKeyAndNullValue() throws IOException {
+        final Map<String,String> map = new HashMap<>();
+        map.put("", null);
+        final JacksonAdapter serializer = new JacksonAdapter();
+        assertEquals("{\"\":null}", serializer.serialize(map));
+    }
+
+    @Test
+    public void mapWithEmptyKeyAndEmptyValue() throws IOException {
+        final Map<String,String> map = new HashMap<>();
+        map.put("", "");
+        final JacksonAdapter serializer = new JacksonAdapter();
+        assertEquals("{\"\":\"\"}", serializer.serialize(map));
+    }
+
+    @Test
+    public void mapWithEmptyKeyAndNonEmptyValue() throws IOException {
+        final Map<String,String> map = new HashMap<>();
+        map.put("", "test");
+        final JacksonAdapter serializer = new JacksonAdapter();
+        assertEquals("{\"\":\"test\"}", serializer.serialize(map));
+    }
+}

pom.xml

@@ -61,12 +61,12 @@
       <dependency>
         <groupId>com.fasterxml.jackson.datatype</groupId>
         <artifactId>jackson-datatype-joda</artifactId>
-        <version>2.9.3</version>
+        <version>2.8.11</version>
       </dependency>
       <dependency>
         <groupId>com.fasterxml.jackson.dataformat</groupId>
         <artifactId>jackson-dataformat-xml</artifactId>
-        <version>2.9.3</version>
+        <version>2.8.11</version>
       </dependency>
       <dependency>
         <groupId>org.apache.commons</groupId>