tests: use stages for the travis execution

.travis.yml

@@ -4,24 +4,37 @@ group: beta
 language: node_js
 node_js:
   - "8"
+
 cache:
   directories:
     - node_modules
-env:
-  -
-  - SOLIDITY_COVERAGE=true
-  - SOLC_NIGHTLY=true
-matrix:
+
+jobs:
+  # XXX fast_finish doesn't work with stages yet. See
+  # https://github.com/travis-ci/travis-ci/issues/8425
+  # --elopio - 20180531
   fast_finish: true
   allow_failures:
     - env: SOLIDITY_COVERAGE=true
     - env: SOLC_NIGHTLY=true
-before_script:
-  - truffle version
-script:
-  - npm run lint
-  - npm run lint:sol
-  - npm run test
+  include:
+    # Run the unit test suite three times in parallel.
+    # The first one gets results faster and is the only one required to pass.
+    # The second one generates the coverage report.
+    # The third one is to keep us informed about possible issues with the
+    # upcoming solidity release.
+    - stage: unit
+      script: npm run test
+    - stage: unit
+      script: npm run test
+      env: SOLIDITY_COVERAGE=true
+    - stage: unit
+      script: npm run test
+      env: SOLC_NIGHTLY=true
+    # solidity and javascript style tests.
+    - stage: static
+      script: npm run lint
+
 notifications:
   slack:
     rooms:

package.json

@@ -8,12 +8,12 @@
   ],
   "scripts": {
     "test": "scripts/test.sh",
-    "lint": "eslint .",
-    "lint:fix": "eslint . --fix",
+    "lint:js": "eslint .",
+    "lint:js:fix": "eslint . --fix",
     "lint:sol": "solium -d .",
     "lint:sol:fix": "solium -d . --fix",
-    "lint:all": "npm run lint && npm run lint:sol",
-    "lint:all:fix": "npm run lint:fix && npm run lint:sol:fix",
+    "lint": "npm run lint:js && npm run lint:sol",
+    "lint:fix": "npm run lint:js:fix && npm run lint:sol:fix",
     "console": "truffle console",
     "coverage": "scripts/coverage.sh",
     "version": "scripts/version.js"

scripts/test.sh

@@ -59,6 +59,8 @@ if [ "$SOLC_NIGHTLY" = true ]; then
   wget -q https://raw.githubusercontent.com/ethereum/solc-bin/gh-pages/bin/soljson-nightly.js -O /tmp/soljson.js && find . -name soljson.js -exec cp /tmp/soljson.js {} \;
 fi
 
+truffle version
+
 if [ "$SOLIDITY_COVERAGE" = true ]; then
   node_modules/.bin/solidity-coverage