Fix regression where failed tests would still leave passing builds.

Makefile

@@ -46,7 +46,7 @@ run-tests: tools
 	mkdir -p $(COVERDIR)
 	rm -f $(COVERDIR)/*
 	for pkg in $(GO_PKGS) ; do \
-		go test -v -covermode count -coverprofile=$(COVERDIR)/$$(echo $$pkg | tr '/' '-').out $$pkg ; \
+		go test -v -covermode count -coverprofile=$(COVERDIR)/$$(echo $$pkg | tr '/' '-').out $$pkg || exit 1 ; \
 	done
 
 test: run-tests
@@ -65,7 +65,7 @@ docker-build:
 	    -v $(shell pwd):/real_src \
 	    -e SHELL_UID=$(shell id -u) -e SHELL_GID=$(shell id -g) \
 	    -w /go/src/github.com/wrouesnel/postgres_exporter \
-		golang:1.8-wheezy \
+		golang:1.9-wheezy \
 		/bin/bash -c "make >&2 && chown $$SHELL_UID:$$SHELL_GID ./postgres_exporter"
 	docker build -t $(CONTAINER_NAME) .
 

postgres_exporter_integration_test_script

@@ -10,6 +10,6 @@ shift
 echo "mode: count" > $output_cov
 
 test_cov=$(mktemp)
-$test_binary -test.coverprofile=$test_cov $@
+$test_binary -test.coverprofile=$test_cov $@ || exit 1
 tail -n +2 $test_cov >> $output_cov
 rm -f $test_cov