Improve support for standard Go tools

Makefile

@@ -25,12 +25,12 @@ _build:
 	touch $@
 
 .PHONY: test
-test: testdata/data/group/test.git clean-build clean-workhorse all
+test:	clean-build clean-workhorse all
 	go fmt ${PKG}/... | awk '{ print } END { if (NR > 0) { print "Please run go fmt"; exit 1 } }'
-	support/path go test ${PKG}/...
+	_support/path go test ${PKG}/...
 	@echo SUCCESS
 
-coverage: testdata/data/group/test.git
+coverage:
 	go test -cover -coverprofile=test.coverage
 	go tool cover -html=test.coverage -o coverage.html
 	rm -f test.coverage
@@ -38,12 +38,6 @@ coverage: testdata/data/group/test.git
 fmt:
 	go fmt ./...
 
-testdata/data/group/test.git: testdata/data
-	git clone --bare https://gitlab.com/gitlab-org/gitlab-test.git $@
-
-testdata/data:
-	mkdir -p $@
-
 .PHONY: clean
 clean:	clean-workhorse clean-build
 	rm -rf testdata/data testdata/scratch

main_test.go

@@ -34,6 +34,22 @@ const testProject = "group/test"
 var checkoutDir = path.Join(scratchDir, "test")
 var cacheDir = path.Join(scratchDir, "cache")
 
+func TestMain(m *testing.M) {
+	source := "https://gitlab.com/gitlab-org/gitlab-test.git"
+	clonePath := path.Join(testRepoRoot, testRepo)
+	if _, err := os.Stat(clonePath); err != nil {
+		testCmd := exec.Command("git", "clone", "--bare", source, clonePath)
+		testCmd.Stdout = os.Stdout
+		testCmd.Stderr = os.Stderr
+
+		if err := testCmd.Run(); err != nil {
+			os.Exit(-1)
+		}
+	}
+
+	os.Exit(m.Run())
+}
+
 func TestAllowedClone(t *testing.T) {
 	// Prepare clone directory
 	if err := os.RemoveAll(scratchDir); err != nil {