Travis CI: Split JavaScript/Python into separate jobs.

.travis.yml

@@ -4,6 +4,10 @@ python:
   - 3.4
   - 3.5
   - 3.6
+env: TEST_SUITE=py
+matrix:
+  include:
+    env: TEST_SUITE=js
 addons:
   apt:
     packages:
@@ -12,11 +16,9 @@ cache:
   pip: true
   directories:
     - ./stethoscope/ui/node_modules
-install:
+before_install:
   - nvm install 6.9.5
-  - nvm use 6.9.5
-  - make install-node-requirements
-  - make install-python-requirements
+install:
+  - ./.travis/install.sh
 script:
-  - pytest
-  - make test-js
+  - make test-$TEST_SUITE

.travis/install.sh

@@ -0,0 +1,16 @@
+#!/bin/sh
+
+set -e
+set -u
+
+case "${TEST_SUITE}" in
+  js)
+    make install-node-requirements;
+  ;;
+  py)
+    make install-python-requirements;
+  ;;
+  *)
+    echo "Unknown test suite: $TEST_SUITE"
+    exit 1
+esac;