From d4df7b454b71f1da6719c9fcbe87d8bff0096a98 Mon Sep 17 00:00:00 2001
From: Dave Marr <dave.marr@gmail.com>
Date: Wed, 12 Apr 2017 11:36:26 -0700
Subject: [PATCH] Clears screen during watch mode correctly. (#2959)

---
 packages/jest-cli/src/watch.js | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/packages/jest-cli/src/watch.js b/packages/jest-cli/src/watch.js
index a6448cfc60cc..137c5acf989b 100644
--- a/packages/jest-cli/src/watch.js
+++ b/packages/jest-cli/src/watch.js
@@ -16,6 +16,8 @@ const ansiEscapes = require('ansi-escapes');
 const chalk = require('chalk');
 const createContext = require('./lib/createContext');
 const HasteMap = require('jest-haste-map');
+const isCI = require('is-ci');
+const isInteractive = process.stdout.isTTY && !isCI;
 const isValidPath = require('./lib/isValidPath');
 const preRunMessage = require('./preRunMessage');
 const runJest = require('./runJest');
@@ -86,7 +88,7 @@ const watch = (
     }
 
     testWatcher = new TestWatcher({isWatchMode: true});
-    pipe.write(CLEAR);
+    isInteractive && pipe.write(CLEAR);
     preRunMessage.print(pipe);
     isRunning = true;
     return runJest(