build: Cleanup Makefile

Draws a boundary between each Driver implementation in the test suite.
The goal is to have less assumptions about the host: it should be able
to build the code, but doesn't need a working postgres and/or mysql
installation to get most of the way there. Testing the code against a
live DB is recommended, but it's separated now.

Makefile

@@ -14,49 +14,31 @@ define LDFLAGS
 -X $(PKG_IMPORT_PATH)/internal/version.Tag=$(shell git describe --tag)
 endef
 
-# Register database drivers to make. For every item in this array, there should
-# be three separate targets elsewhere in the Makefile. Here's an example using a
-# made-up DBMS:
-#
-#	foodb-test-setup:
-#		command to create $(TEST_DB_NAME)
-#	foodb-test-teardown:
-#		command to drop $(TEST_DB_NAME)
-#	foodb:
-#		go build ...
-#
-# One should have a target suffix "-test-teardown", another should have the
-# target suffix "-test-setup" and the last one is just named after the DBMS,
-# which builds the CLI binary.
-DRIVERS ?= postgres mysql
+test:
+	$(GO) test $(ARGS) . ./internal/...
 
-SETUPS=$(addsuffix -test-setup, $(DRIVERS))
-TEARDOWNS=$(addsuffix -test-teardown, $(DRIVERS))
-
-test: test-teardowns test-setups
-	go test $(ARGS) . ./internal/stub $(addprefix ./drivers/, $(DRIVERS))
-test-setups: $(SETUPS)
-test-teardowns: $(TEARDOWNS)
-
-.PHONY: $(DRIVERS) clean
 clean:
 	rm $(BIN)
 
 postgres:
-	go build -o $(BIN) -v \
+	$(GO) build -o $(BIN) -v \
 		-ldflags "$(LDFLAGS) \
 		-X $(PKG_IMPORT_PATH)/internal/version.Driver=postgres" \
 		./drivers/postgres/godfish
+postgres-test:
+	$(GO) test $(ARGS) ./drivers/postgres
 postgres-test-teardown:
 	dropdb --if-exists $(TEST_DB_NAME)
 postgres-test-setup:
 	createdb -E utf8 $(TEST_DB_NAME)
 
 mysql:
-	go build -o $(BIN) -v \
+	$(GO) build -o $(BIN) -v \
 		-ldflags "$(LDFLAGS) \
 		-X $(PKG_IMPORT_PATH)/internal/version.Driver=mysql" \
 		./drivers/mysql/godfish
+mysql-test:
+	$(GO) test $(ARGS) ./drivers/mysql
 mysql-test-teardown:
 	mysql -u $(DB_USER) -h $(DB_HOST) \
 		-e "DROP DATABASE IF EXISTS ${TEST_DB_NAME}"