Switch to CircleCI. (#125)

3 files changed, 70 insertions, 16 deletions

diff --git a/.circleci/config.yml b/.circleci/config.yml
new file mode 100644
index 0000000..c5f7926
--- /dev/null
+++ b/.circleci/config.yml
@@ -0,0 +1,68 @@
+version: 2.1
+
+aliases:
+  - &npm_cache_filename |
+    {{ .Environment.CIRCLE_JOB }}-{{ .Branch }}-{{ checksum ".circleci/config.yml" }}-{{ checksum "package-lock.json" }}
+
+commands:
+  install:
+    parameters:
+      install-commands:
+        description: "Steps that will be executed before the tests"
+        type: steps
+        default: []
+    steps:
+      - checkout
+      - restore_cache:
+          key: *npm_cache_filename
+          name: Restoring npm modules
+      - run: node --version
+      - run: npm --version
+
+jobs:
+  node-6:
+    docker:
+      - image: circleci/node:6-stretch
+    steps:
+      - install
+      - run: npm install
+      - save_cache:
+          key: *npm_cache_filename
+          name: Save npm modules
+          paths:
+            - ./node_modules/
+      - run: npm test
+
+  node-8:
+    docker:
+      - image: circleci/node:8-stretch
+    steps:
+      - install
+      - run: npm ci
+      - save_cache:
+          key: *npm_cache_filename
+          name: Save npm modules
+          paths:
+            - /home/circleci/.npm
+      - run: npm test
+
+  node-10:
+    docker:
+      - image: circleci/node:10-stretch
+    steps:
+      - install
+      - run: npm ci
+      - save_cache:
+          key: *npm_cache_filename
+          name: Save npm modules
+          paths:
+            - /home/circleci/.npm
+      - run: npm test
+
+workflows:
+  version: 2
+  test:
+    jobs:
+      - node-6
+      - node-8
+      - node-10
diff --git a/.travis.yml b/.travis.yml
deleted file mode 100644
index fa2b991..0000000
--- a/.travis.yml
+++ /dev/null
@@ -1,14 +0,0 @@
-language: node_js
-git:
-  depth: 3
-node_js:
-  - "6"
-  - "8"
-  - "10"
-install:
-  - npm install
-cache:
-  directories:
-    - node_modules
-notifications:
-  email: false
diff --git a/README.md b/README.md
index 6d58422..db47514 100644
--- a/README.md
+++ b/README.md
@@ -378,5 +378,5 @@ Code released under [the MIT license](https://github.com/twbs/rfs/blob/master/LI
 [npm-url]: https://npmjs.org/package/rfs
 [licence-image]: https://img.shields.io/npm/l/rfs.svg
 [license-url]: https://github.com/twbs/rfs/blob/master/LICENSE
-[build-image]: https://img.shields.io/travis/twbs/rfs/master.svg
-[build-url]: https://travis-ci.org/twbs/rfs
+[build-image]: https://img.shields.io/circleci/project/gh/twbs/rfs/master.svg
+[build-url]: https://circleci.com/gh/twbs/rfs