**Root problem:** include a phpunit output in a commit message
**Reproduction steps**
1. Create a revision
2. Add the following text through the web UI to Test plan: field
```
…
Test plan:
` ` `
$ phpunit
[…]
OK, but incomplete, skipped, or risky tests!
Tests: 181, Assertions: 328, Incomplete: 2.
` ` `
…
```
3. Try `arc diff`.
**Expected result**
As it's enclosed in ` ` ` block, not to be parsed by Arcanist.
**Actual result**
Arcanist is more than happy to parse it.
[2016-12-31 03:22:04] EXCEPTION: (ArcanistDifferentialCommitMessageParserException) Field "testPlan" occurs twice in commit message! at [<arcanist>/src/differential/ArcanistDifferentialCommitMessage.php:54]
arcanist(head=master, ref.master=fad85844314b), phutil(head=master, ref.master=5ac2ca121489)
#0 ArcanistDifferentialCommitMessage::pullDataFromConduit(ConduitClient) called at [<arcanist>/src/workflow/ArcanistDiffWorkflow.php:1795]
#1 ArcanistDiffWorkflow::getCommitMessageFromRevision(string) called at [<arcanist>/src/workflow/ArcanistDiffWorkflow.php:1527]
#2 ArcanistDiffWorkflow::buildCommitMessage() called at [<arcanist>/src/workflow/ArcanistDiffWorkflow.php:469]
#3 ArcanistDiffWorkflow::run() called at [<arcanist>/scripts/arcanist.php:394]