rmuir commented on a change in pull request #119:
URL: https://github.com/apache/lucene/pull/119#discussion_r624467798
##########
File path: help/tests.txt
##########
@@ -156,6 +156,16 @@ to increase the top-N count:
gradlew -p lucene/core test -Ptests.profile=true -Ptests.profile.count=100
+Generating Coverage Reports
+------------------------------
+
+Adding the property "tests.coverage=true" will run the tests with
instrumentation to
+record coverage. The "jacocoTestReport" target will generate a report from
those files.
+
+Example:
+
+gradlew -p lucene/core -Ptests.coverage=true test jacocoTestReport
Review comment:
Well, anything making this easier to use would be great!
I really wanted the help documentation to show two phases:
1. instrumented test execution (must be opt-in with some parameter)
2. report generation
But it made things too confusing: e.g. say you make this mistake:
```console
$ gradlew -Ptests.coverage=true test
$ gradlew jacocoTestReport
```
In that case jacoco plugin is never applied and so you get a crazy error
message for missing task `jacocoTestReport`. You must also add
`-Ptests.coverage=true` to this secondary reporting task, or it won't work.
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