rmuir commented on a change in pull request #119:
URL: https://github.com/apache/lucene/pull/119#discussion_r624452579



##########
File path: gradle/testing/coverage.gradle
##########
@@ -0,0 +1,33 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF 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.
+ */
+
+if (Boolean.parseBoolean(propertyOrDefault("tests.coverage", "false"))) {
+  allprojects {
+    apply plugin: "jacoco"
+    tasks.withType(Test) {
+      // XXX: too many things called "workingDir" in gradle!
+      def targetDir = "${buildDir}/tmp/tests-cwd"

Review comment:
       @dweiss one thing is the fact that jacoco runs in append-mode. We don't 
want to just keep accumulating coverage over unrelated `gradle test` runs. The 
append-only mode serves a separate purpose, that is to allow N test jvms to 
append to the same output database (just saves us a merging step, really)
    




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