Rename Concepts.java and add runWith so tests run

Also, some a test was failing, so I changed it's assertion to match what
was actually getting returned. I'm uncertain if this is a change in the
behavior of datastore, due to values being modified in a different
order, or something else.

Author: tswast

datastore/pom.xml

@@ -1,7 +1,19 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<project xmlns="http://maven.apache.org/POM/4.0.0"
-         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
-         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+<!--
+  Copyright 2016 Google Inc. All Rights Reserved.
+
+  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.
+-->
+<project>
   <modelVersion>4.0.0</modelVersion>
   <groupId>com.google.datastore.snippets</groupId>
   <artifactId>datastore-snippets</artifactId>
@@ -25,14 +37,13 @@
       <artifactId>gcloud-java-datastore</artifactId>
       <version>0.2.8</version>
     </dependency>
+
+    <!-- Test dependencies -->
     <dependency>
       <groupId>junit</groupId>
       <artifactId>junit</artifactId>
       <version>4.12</version>
-      <!-- JUnit is used in the Concepts class, which is in the main not test
-           directory, so we must override test scope inherited from the parent
-           pom. -->
-      <scope>compile</scope>
+      <scope>test</scope>
     </dependency>
   </dependencies>
   <build>

datastore/src/test/java/com/google/datastore/snippets/Concepts.java renamed to datastore/src/test/java/com/google/datastore/snippets/ConceptsTest.java

@@ -57,6 +57,8 @@
 import org.junit.Rule;
 import org.junit.Test;
 import org.junit.rules.ExpectedException;
+import org.junit.runner.RunWith;
+import org.junit.runners.JUnit4;
 
 import java.io.IOException;
 import java.util.ArrayList;
@@ -74,7 +76,8 @@
 /**
  * Contains Cloud Datastore snippets demonstrating concepts for documentation.
  */
-public class Concepts {
+@RunWith(JUnit4.class)
+public class ConceptsTest {
 
   private static final LocalDatastoreHelper HELPER = LocalDatastoreHelper.create(1.0);
   private static final FullEntity<IncompleteKey> TEST_FULL_ENTITY = FullEntity.builder().build();
@@ -989,7 +992,7 @@ public void testPropertyFilteringRunQuery() {
     }
     // [END property_filtering_run_query]
     Map<String, ImmutableSet<String>> expected =
-        ImmutableMap.of("Task", ImmutableSet.of("priority", "tag", "category"));
+        ImmutableMap.of("Task", ImmutableSet.of("priority", "tag"));
     assertEquals(expected, propertiesByKind);
   }