Support running examples tests locally (#758)

Use Docker Compose to run MySQL and PostgreSQL locally

Author: kyleconroy

Makefile

@@ -1,14 +1,19 @@
+.PHONY: build test test-examples regen
+
 build:
 	go build ./...
 
 test:
 	go test ./...
 
+test-examples:
+	go test --tags=examples ./...
+
+regen: sqlc-dev
+	go run ./scripts/regenerate/
+
 sqlc-dev:
 	go build -o ~/bin/sqlc-dev ./cmd/sqlc/
 
 sqlc-pg-gen:
 	go build -o ~/bin/sqlc-pg-gen ./internal/tools/sqlc-pg-gen
-
-regen: sqlc-dev
-	go run ./scripts/regenerate/

README.md

@@ -471,15 +471,24 @@ go build -o ~/go/bin/sqlc-dev ./cmd/sqlc
 
 ### Running Tests
 
-To run the tests, include the `exp` tag. Without this tag, a few tests will
-fail.
+```
+go test ./...
+```
+
+To run the tests in the examples folder, use the `examples` tag.
+
+```
+go test --tags=examples ./...
+```
+
+These tests require locally-running database instances. Run these databases
+using [Docker Compose](https://docs.docker.com/compose/).
 
 ```
-go test --tags=exp ./...
+docker-compose up -d
 ```
 
-To run the tests in the examples folder, a running PostgreSQL instance is
-required. The tests use the following environment variables to connect to the
+The tests use the following environment variables to connect to the
 database
 
 #### For PostgreSQL
@@ -506,10 +515,6 @@ MYSQL_ROOT_PASSWORD  mysecretpassword
 MYSQL_DATABASE  dinotest
 ```
 
-```
-go test --tags=examples,exp ./...
-```
-
 ### Regenerate expected test output
 
 If you need to update a large number of expected test output in the

docker-compose.yml

@@ -0,0 +1,22 @@
+version: "3.8"
+services:
+  mysql:
+    image: "mysql:8"
+    ports:
+      - "3306:3306"
+    restart: always
+    environment:
+      MYSQL_DATABASE: dinotest
+      MYSQL_PASSWORD: mysecretpassword
+      MYSQL_ROOT_PASSWORD: mysecretpassword
+      MYSQL_USER: root
+
+  postgresql:
+    image: "postgres:13"
+    ports:
+      - "5432:5432"
+    restart: always
+    environment:
+      POSTGRES_DB: dinotest
+      POSTGRES_PASSWORD: mysecretpassword
+      POSTGRES_USER: postgres