Replace GerritBaseTests#sanitizedMethodName with a TestRule

Use delegation to implement a new TestRule that wraps JUnit's TestName.
Avoids the need for inheriting from a base class just to use this
method.

Change-Id: Ia3d8487f9b3d65f62d8d1c815e4d009794af2779

java/com/google/gerrit/testing/GerritTestName.java

@@ -0,0 +1,42 @@
+// Copyright (C) 2019 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.testing;
+
+import com.google.common.base.CharMatcher;
+import org.junit.rules.TestName;
+import org.junit.rules.TestRule;
+import org.junit.runner.Description;
+import org.junit.runners.model.Statement;
+
+public class GerritTestName implements TestRule {
+  private final TestName delegate = new TestName();
+
+  public String getSanitizedMethodName() {
+    String name = delegate.getMethodName().toLowerCase();
+    name =
+        CharMatcher.inRange('a', 'z')
+            .or(CharMatcher.inRange('A', 'Z'))
+            .or(CharMatcher.inRange('0', '9'))
+            .negate()
+            .replaceFrom(name, '_');
+    name = CharMatcher.is('_').trimTrailingFrom(name);
+    return name;
+  }
+
+  @Override
+  public Statement apply(Statement base, Description description) {
+    return delegate.apply(base, description);
+  }
+}