Fail build if any tests fail

 Fixes hybridgroup#464

* Move CI testing into ci/test.sh
* Delegate to script in Makefile

Makefile

@@ -12,18 +12,11 @@ race:
 
 # Check for code well-formedness
 fmt_check:
-	gofmt -s -d . | read
+	! gofmt -s -d . | read
 
 # Test and generate coverage
 test_with_coverage:
-	echo "" > profile.cov
-	for package in $(excluding_vendor) ; do \
-		go test -covermode=count -coverprofile=tmp.cov $$package ; \
-		if [ -f tmp.cov ]; then \
-			cat tmp.cov >> profile.cov ; \
-			rm tmp.cov ; \
-		fi ; \
-	done
+	./ci/test.sh
 
 deps:
 ifeq (,$(shell which dep))

ci/test.sh

@@ -0,0 +1,38 @@
+#!/bin/bash
+set -euo pipefail
+
+# Print commands as executed
+#set -x
+
+
+# Hold the package names that contain failures
+fail_packages=()
+
+pushd $PWD/..
+	# Set up coverage report file
+	COVERAGE_REPORT_LOCATION="./profile.cov"
+	echo "" > $COVERAGE_REPORT_LOCATION
+
+	# Exclude vendor in the same way as Makefile does
+	EXCLUDING_VENDOR=$(go list ./... | grep -v /vendor/)
+
+	# Iterate over all non-vendor packages and run tests with coverage
+	for package in $EXCLUDING_VENDOR; do \
+		result=$(go test -covermode=count -coverprofile=tmp.cov $package)
+		echo $result
+
+		# If a `go test` command has failures, it will exit 1
+		if [ $? -ne 0 ]; then
+			fail_packages+=($package);
+		fi;
+		if [ -f tmp.cov ]; then
+			cat tmp.cov >> profile.cov;
+			rm tmp.cov;
+		fi;
+	done
+
+	# exit 1 if there have been any test failures
+	if [ ${#fails[@]} -ne 0 ]; then
+		exit 1
+	fi;
+popd