packer_test: add SkipNoAcc function

The SkipNoAcc function on PackerTestSuite allows to mark a test run as
not to be run every time we run `make test`, but only when PACKER_ACC=1
is set in the environment.

This allows us to skip executing tests that are either long-running, or
that depend on external dependencies (typically Github), which have a
higher potential to fail on a normal run of Packer tests.

packer_test/init_test.go

@@ -1,6 +1,8 @@
 package packer_test
 
 func (ts *PackerTestSuite) TestPackerInitForce() {
+	ts.SkipNoAcc()
+
 	pluginPath, cleanup := ts.MakePluginDir()
 	defer cleanup()
 
@@ -18,6 +20,8 @@ func (ts *PackerTestSuite) TestPackerInitForce() {
 }
 
 func (ts *PackerTestSuite) TestPackerInitUpgrade() {
+	ts.SkipNoAcc()
+
 	pluginPath, cleanup := ts.MakePluginDir()
 	defer cleanup()
 
@@ -62,6 +66,8 @@ func (ts *PackerTestSuite) TestPackerInitWithNonGithubSource() {
 }
 
 func (ts *PackerTestSuite) TestPackerInitWithMixedVersions() {
+	ts.SkipNoAcc()
+
 	pluginPath, cleanup := ts.MakePluginDir()
 	defer cleanup()
 

packer_test/install_test.go

@@ -69,6 +69,8 @@ func (ts *PackerTestSuite) TestInstallPluginPrerelease() {
 }
 
 func (ts *PackerTestSuite) TestRemoteInstallWithPluginsInstall() {
+	ts.SkipNoAcc()
+
 	pluginPath, cleanup := ts.MakePluginDir()
 	defer cleanup()
 
@@ -80,6 +82,8 @@ func (ts *PackerTestSuite) TestRemoteInstallWithPluginsInstall() {
 }
 
 func (ts *PackerTestSuite) TestRemoteInstallOfPreReleasePlugin() {
+	ts.SkipNoAcc()
+
 	pluginPath, cleanup := ts.MakePluginDir()
 	defer cleanup()
 

packer_test/suite_test.go

@@ -42,6 +42,20 @@ func (ts *PackerTestSuite) buildPluginBinaries(t *testing.T) {
 	wg.Wait()
 }
 
+// SkipNoAcc is a pre-condition that skips the test if the PACKER_ACC environment
+// variable is unset, or set to "0".
+//
+// This allows us to build tests with a potential for long runs (or errors like
+// rate-limiting), so we can still test them, but only in a longer timeouted
+// context.
+func (ts *PackerTestSuite) SkipNoAcc() {
+	acc := os.Getenv("PACKER_ACC")
+	if acc == "" || acc == "0" {
+		ts.T().Logf("Skipping test as `PACKER_ACC` is unset.")
+		ts.T().Skip()
+	}
+}
+
 func Test_PackerCoreSuite(t *testing.T) {
 	ts := &PackerTestSuite{}