Add test for ChangeMessage UUID format

Change-Id: I3dd98f22b50902f297e6ade86833bff23a8df0cc

gerrit-server/src/test/java/com/google/gerrit/server/ChangeUtilTest.java

@@ -0,0 +1,186 @@
+// Copyright (C) 2017 The Android Open Source Project
+//
+// 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 com.google.gerrit.server;
+
+import static com.google.common.truth.Truth.assertThat;
+
+import com.google.gerrit.reviewdb.server.AccountAccess;
+import com.google.gerrit.reviewdb.server.AccountExternalIdAccess;
+import com.google.gerrit.reviewdb.server.AccountGroupAccess;
+import com.google.gerrit.reviewdb.server.AccountGroupByIdAccess;
+import com.google.gerrit.reviewdb.server.AccountGroupByIdAudAccess;
+import com.google.gerrit.reviewdb.server.AccountGroupMemberAccess;
+import com.google.gerrit.reviewdb.server.AccountGroupMemberAuditAccess;
+import com.google.gerrit.reviewdb.server.AccountGroupNameAccess;
+import com.google.gerrit.reviewdb.server.ChangeAccess;
+import com.google.gerrit.reviewdb.server.ChangeMessageAccess;
+import com.google.gerrit.reviewdb.server.PatchLineCommentAccess;
+import com.google.gerrit.reviewdb.server.PatchSetAccess;
+import com.google.gerrit.reviewdb.server.PatchSetApprovalAccess;
+import com.google.gerrit.reviewdb.server.ReviewDb;
+import com.google.gerrit.reviewdb.server.SchemaVersionAccess;
+import com.google.gerrit.reviewdb.server.SystemConfigAccess;
+import com.google.gwtorm.server.Access;
+import com.google.gwtorm.server.StatementExecutor;
+
+import org.junit.Test;
+
+import java.util.concurrent.atomic.AtomicInteger;
+import java.util.regex.Pattern;
+
+public class ChangeUtilTest {
+  @Test
+  public void changeMessageUuid() throws Exception {
+    Pattern pat = Pattern.compile("^[0-9a-f]{8}_[0-9a-f]{8}$");
+    assertThat("abcd1234_0987fedc").matches(pat);
+
+    ReviewDb db = new FakeDb();
+    String id1 = ChangeUtil.messageUUID(db);
+    assertThat(id1).matches(pat);
+
+    String id2 = ChangeUtil.messageUUID(db);
+    assertThat(id2).isNotEqualTo(id1);
+    assertThat(id2).matches(pat);
+  }
+
+  private static class FakeDb implements ReviewDb {
+    private final AtomicInteger SEQ = new AtomicInteger(100);
+
+    @Override
+    public int nextChangeMessageId() {
+      return SEQ.getAndIncrement();
+    }
+
+    @Override
+    public void commit() {
+      throw new UnsupportedOperationException();
+    }
+
+    @Override
+    public void rollback() {
+      throw new UnsupportedOperationException();
+    }
+
+    @Override
+    public void updateSchema(StatementExecutor e) {
+      throw new UnsupportedOperationException();
+    }
+
+    @Override
+    public void pruneSchema(StatementExecutor e) {
+      throw new UnsupportedOperationException();
+    }
+
+    @Override
+    public Access<?, ?>[] allRelations() {
+      throw new UnsupportedOperationException();
+    }
+
+    @Override
+    public void close() {
+      throw new UnsupportedOperationException();
+    }
+
+    @Override
+    public SchemaVersionAccess schemaVersion() {
+      throw new UnsupportedOperationException();
+    }
+
+    @Override
+    public SystemConfigAccess systemConfig() {
+      throw new UnsupportedOperationException();
+    }
+
+    @Override
+    public AccountAccess accounts() {
+      throw new UnsupportedOperationException();
+    }
+
+    @Override
+    public AccountExternalIdAccess accountExternalIds() {
+      throw new UnsupportedOperationException();
+    }
+
+    @Override
+    public AccountGroupAccess accountGroups() {
+      throw new UnsupportedOperationException();
+    }
+
+    @Override
+    public AccountGroupNameAccess accountGroupNames() {
+      throw new UnsupportedOperationException();
+    }
+
+    @Override
+    public AccountGroupMemberAccess accountGroupMembers() {
+      throw new UnsupportedOperationException();
+    }
+
+    @Override
+    public AccountGroupMemberAuditAccess accountGroupMembersAudit() {
+      throw new UnsupportedOperationException();
+    }
+
+    @Override
+    public ChangeAccess changes() {
+      throw new UnsupportedOperationException();
+    }
+
+    @Override
+    public PatchSetApprovalAccess patchSetApprovals() {
+      throw new UnsupportedOperationException();
+    }
+
+    @Override
+    public ChangeMessageAccess changeMessages() {
+      throw new UnsupportedOperationException();
+    }
+
+    @Override
+    public PatchSetAccess patchSets() {
+      throw new UnsupportedOperationException();
+    }
+
+    @Override
+    public PatchLineCommentAccess patchComments() {
+      throw new UnsupportedOperationException();
+    }
+
+    @Override
+    public AccountGroupByIdAccess accountGroupById() {
+      throw new UnsupportedOperationException();
+    }
+
+    @Override
+    public AccountGroupByIdAudAccess accountGroupByIdAud() {
+      throw new UnsupportedOperationException();
+    }
+
+    @Override
+    public int nextAccountId() {
+      throw new UnsupportedOperationException();
+    }
+
+    @Override
+    public int nextAccountGroupId() {
+      throw new UnsupportedOperationException();
+    }
+
+    @Override
+    public int nextChangeId() {
+      throw new UnsupportedOperationException();
+    }
+  }
+}