test environments using docker compose

Author: dominicarrojado

Dockerfile

@@ -12,6 +12,18 @@ RUN yarn install --frozen-lockfile
 COPY . .
 CMD [ "yarn", "start:dev" ]
 
+FROM dev AS test
+ENV NODE_ENV=test
+CMD [ "yarn", "test" ]
+
+FROM test AS test-cov
+CMD [ "yarn", "test:cov" ]
+
+FROM test AS test-watch
+ENV GIT_WORK_TREE=/app GIT_DIR=/app/.git
+RUN apk add git
+CMD [ "yarn", "test:watch" ]
+
 FROM base AS prod
 ENV NODE_ENV=production
 RUN yarn install --frozen-lockfile --production

package.json

@@ -19,7 +19,10 @@
     "test:cov": "STAGE=dev jest --coverage",
     "test:debug": "node --inspect-brk -r tsconfig-paths/register -r ts-node/register node_modules/.bin/jest --runInBand",
     "test:e2e": "jest --config ./test/jest-e2e.json",
-    "docker-compose:dev": "docker-compose up --build"
+    "docker-compose:dev": "docker-compose up --build",
+    "docker-compose:test": "docker-compose -f docker-compose.yml -f test.yml up --build --exit-code-from app",
+    "docker-compose:test:watch": "docker-compose -f docker-compose.yml -f test-watch.yml up --build",
+    "docker-compose:test:cov": "docker-compose -f docker-compose.yml -f test-cov.yml up --build"
   },
   "dependencies": {
     "@nestjs/common": "^8.0.0",

test-cov.yml

@@ -0,0 +1,4 @@
+services:
+  app:
+    build:
+      target: test-cov

test-watch.yml

@@ -0,0 +1,6 @@
+services:
+  app:
+    build:
+      target: test-watch
+    volumes:
+      - .git:/app/.git/

test.yml

@@ -0,0 +1,4 @@
+services:
+  app:
+    build:
+      target: test