Added GeoHashTypeTests

Author: nyurik

server/src/test/java/org/elasticsearch/common/geo/GeoHashTypeTests.java

@@ -0,0 +1,111 @@
+/*
+ * Licensed to Elasticsearch under one or more contributor
+ * license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright
+ * ownership. Elasticsearch licenses this file to you 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.elasticsearch.common.geo;
+
+import org.elasticsearch.Version;
+import org.elasticsearch.common.io.stream.BytesStreamOutput;
+import org.elasticsearch.common.io.stream.StreamInput;
+import org.elasticsearch.search.aggregations.bucket.geogrid.GeoHashType;
+import org.elasticsearch.test.ESTestCase;
+
+import java.io.IOException;
+
+import static org.hamcrest.Matchers.containsString;
+import static org.hamcrest.Matchers.equalTo;
+
+public class GeoHashTypeTests extends ESTestCase {
+
+    public void testValidOrdinals() {
+        assertThat(GeoHashType.DEFAULT.ordinal(), equalTo(0));
+        assertThat(GeoHashType.GEOHASH.ordinal(), equalTo(0));
+    }
+
+    public void testWriteTo() throws Exception {
+        try (BytesStreamOutput out = new BytesStreamOutput()) {
+
+            // FIXME: update version after backport
+
+            final Version version = Version.V_7_0_0_alpha1;
+            out.setVersion(version);
+            GeoHashType.GEOHASH.writeTo(out);
+            try (StreamInput in = out.bytes().streamInput()) {
+                assertThat(in.readVInt(), equalTo(0));
+            }
+        }
+
+        try (BytesStreamOutput out = new BytesStreamOutput()) {
+
+            // FIXME: update version after backport to the last unsupported
+
+            out.setVersion(Version.V_6_3_0);
+            GeoHashType.GEOHASH.writeTo(out);
+            // Should not have written anything
+            assertThat(out.size(), equalTo(0));
+        }
+
+        // ATTENTION: new hashing types should also assert that writeTo() throws
+        // an error when values other than GEOHASH are written to older version streams
+    }
+
+    public void testReadFrom() throws Exception {
+        try (BytesStreamOutput out = new BytesStreamOutput()) {
+            out.writeVInt(0);
+            try (StreamInput in = out.bytes().streamInput()) {
+
+                // FIXME: update version after backport
+
+                in.setVersion(Version.V_7_0_0_alpha1);
+                assertThat(in.available(), equalTo(1));
+                assertThat(GeoHashType.readFromStream(in), equalTo(GeoHashType.GEOHASH));
+                assertThat(in.available(), equalTo(0));
+            }
+        }
+
+        try (BytesStreamOutput out = new BytesStreamOutput()) {
+            // keep the stream empty to cause an exception if a read is attempted
+            try (StreamInput in = out.bytes().streamInput()) {
+
+                // FIXME: update version after backport to the last unsupported
+
+                in.setVersion(Version.V_6_3_0);
+                assertThat(in.available(), equalTo(0));
+                assertThat(in.available(), equalTo(0));
+                assertThat(GeoHashType.readFromStream(in), equalTo(GeoHashType.GEOHASH));
+            }
+        }
+    }
+
+    public void testInvalidReadFrom() throws Exception {
+        try (BytesStreamOutput out = new BytesStreamOutput()) {
+            out.writeVInt(randomIntBetween(1, Integer.MAX_VALUE));
+            try (StreamInput in = out.bytes().streamInput()) {
+
+                // FIXME: update version after backport
+
+                in.setVersion(Version.V_7_0_0_alpha1);
+                GeoHashType.readFromStream(in);
+                fail("Expected IOException");
+            } catch(IOException e) {
+                assertThat(e.getMessage(), containsString("Unknown GeoHashType ordinal ["));
+            }
+
+        }
+    }
+}