chore(travis): add a new job that runs ci-checks

Previously, ddescribe, merge-conflicts, jshint, and jscs would run
after unit & e2e tests ran. The order was orginally changed as part of
#9792.

While the logic is sound that style errors shouldn't block tests from
running, ddescribe should always run. This was not guaraneteed; when
Travis exits with a warning after some browsers have run, ddescribe
doesn't get run and it doesn't become apparent that not
all tests have run.

Additionally, a separate job clearly separates style from test errors,
which e.g. means you can open a PR that includes an iit to speed up
the job, and see immediately if the test passes, because the ddescribe
error is in another job.

.travis.yml

@@ -15,6 +15,7 @@ branches:
 
 env:
   matrix:
+    - JOB=ci-checks
     - JOB=unit BROWSER_PROVIDER=saucelabs
     - JOB=docs-e2e BROWSER_PROVIDER=saucelabs
     - JOB=e2e TEST_TARGET=jqlite BROWSER_PROVIDER=saucelabs
@@ -51,11 +52,7 @@ install:
   - npm install
 
 before_script:
-  - mkdir -p $LOGS_DIR
-  - ./scripts/travis/start_browser_provider.sh
-  - npm install -g grunt-cli
-  - grunt package
-  - ./scripts/travis/wait_for_browser_provider.sh
+  - ./scripts/travis/before_build.sh
 
 script:
   - ./scripts/travis/build.sh

scripts/travis/before_build.sh

@@ -0,0 +1,18 @@
+#!/bin/bash
+
+set -e
+
+mkdir -p $LOGS_DIR
+
+if [ $JOB != "ci-checks" ]; then
+  echo "start_browser_provider"
+  ./scripts/travis/start_browser_provider.sh
+fi
+
+npm install -g grunt-cli
+
+if [ $JOB != "ci-checks" ]; then
+  grunt package
+  echo "wait_for_browser_provider"
+  ./scripts/travis/wait_for_browser_provider.sh
+fi

scripts/travis/build.sh

@@ -5,7 +5,9 @@ set -e
 export BROWSER_STACK_ACCESS_KEY=`echo $BROWSER_STACK_ACCESS_KEY | rev`
 export SAUCE_ACCESS_KEY=`echo $SAUCE_ACCESS_KEY | rev`
 
-if [ $JOB = "unit" ]; then
+if [ $JOB = "ci-checks" ]; then
+  grunt ci-checks
+elif [ $JOB = "unit" ]; then
   if [ "$BROWSER_PROVIDER" == "browserstack" ]; then
     BROWSERS="BS_Chrome,BS_Safari,BS_Firefox,BS_IE_9,BS_IE_10,BS_IE_11,BS_iOS"
   else
@@ -14,7 +16,6 @@ if [ $JOB = "unit" ]; then
 
   grunt test:promises-aplus
   grunt test:unit --browsers $BROWSERS --reporters dots
-  grunt ci-checks
   grunt tests:docs --browsers $BROWSERS --reporters dots
 elif [ $JOB = "docs-e2e" ]; then
   grunt test:travis-protractor --specs "docs/app/e2e/**/*.scenario.js"
@@ -31,5 +32,5 @@ elif [ $JOB = "e2e" ]; then
   export TARGET_SPECS="test/e2e/tests/**/*.js,$TARGET_SPECS"
   grunt test:travis-protractor --specs "$TARGET_SPECS"
 else
-  echo "Unknown job type. Please set JOB=unit or JOB=e2e-*."
+  echo "Unknown job type. Please set JOB=ci-checks, JOB=unit or JOB=e2e-*."
 fi