fix: add CI tests (#19)

- this is a fix because under the hood it updates this plugin to latest built API (work was done in PR #18)

Author: bahmutov

.gitignore

@@ -1,3 +1,3 @@
 node_modules/
-cypress/videos
 cypress/screenshots
+**/cypress/videos

CONTRIBUTING.md

@@ -1,13 +1,12 @@
 How to [code a plugin](https://github.com/netlify/build/blob/master/docs/creating-a-plugin.md)
 
-## Testing and releasing a new version
+## Testing
 
-If helps to install [Netlify CLI](https://github.com/netlify/cli) to test the plugin locally
+End-to-end tests are in folder [tests](tests) and they use this [plugin locally](https://github.com/netlify/build/blob/master/README.md#using-a-local-plugin) and build each subfolder using Netlify CLI on CircleCI. You can find the test recordings at [Cypress Dashboard](https://dashboard.cypress.io/projects/ixroqc/)
 
-```shell
-npm install netlify-cli -g
-netlify build
-```
+## Releasing a new version
+
+Before releasing check that each CircleCI job has actually run the tests correctly. We don't have a way to check if Cypress _executed all tests_, other than looking at the CircleCI terminal output.
 
 Try using `beta` branch to release new pre-release versions of the plugin by following [the semantic release guide](https://github.com/semantic-release/semantic-release/blob/master/docs/recipes/pre-releases.md). You can fork and test out new versions published to NPM using the [netlify-plugin-cypress-example](https://github.com/cypress-io/netlify-plugin-cypress-example) repository. Hope the `master` branch merged into `beta` does not bring features and fixes *already released*. Thus I suggest using `beta` branch for new features.
 

circle.yml

@@ -1,6 +1,7 @@
 version: 2.1
 orbs:
   node: circleci/[email protected]
+  cypress: cypress-io/cypress@1
 jobs:
   build:
     executor:
@@ -23,14 +24,82 @@ jobs:
             - run: npm ci
       - run: npx semantic-release
 
+  'basic test':
+    executor: cypress/base-12-14-0
+    steps:
+      # all dependencies were installed in previous job
+      - attach_workspace:
+          at: ~/
+      - run:
+          name: Netlify Build 🏗
+          command: npx netlify build
+          working_directory: tests/basic
+          environment:
+            DEBUG: netlify-plugin-cypress
+
+  'recommended test':
+    executor: cypress/base-12-14-0
+    steps:
+      # all dependencies were installed in previous job
+      - attach_workspace:
+          at: ~/
+      - run:
+          name: Netlify Build 🏗
+          command: npx netlify build
+          working_directory: tests/recommended
+          environment:
+            DEBUG: netlify-plugin-cypress
+
+  'recording test':
+    executor: cypress/base-12-14-0
+    steps:
+      # all dependencies were installed in previous job
+      - attach_workspace:
+          at: ~/
+      - run:
+          name: Netlify Build 🏗
+          command: npx netlify build
+          working_directory: tests/recording
+          environment:
+            DEBUG: netlify-plugin-cypress
+
+  'test-twice':
+    executor: cypress/base-12-14-0
+    steps:
+      # all dependencies were installed in previous job
+      - attach_workspace:
+          at: ~/
+      - run:
+          name: Netlify Build 🏗
+          command: npx netlify build
+          working_directory: tests/test-twice
+          environment:
+            DEBUG: netlify-plugin-cypress
 workflows:
   version: 2
   test_and_release:
     jobs:
       - build
+      - cypress/install
+      - 'basic test':
+          requires:
+            - cypress/install
+      - 'recommended test':
+          requires:
+            - cypress/install
+      - 'recording test':
+          requires:
+            - cypress/install
+      - 'test-twice':
+          requires:
+            - cypress/install
       - release:
           requires:
             - build
+            - 'basic test'
+            - 'recommended test'
+            - 'recording test'
+            - 'test-twice'
           filters:
             branches:
               only: