use env vars for possible e2e test image substitution (#289)

Signed-off-by: Jordan Keister <jordan@nimblewidget.com>

test/e2e/e2e_suite_test.go

@@ -2,6 +2,7 @@ package e2e
 
 import (
 	"context"
+	"os"
 	"testing"
 	"time"
 
@@ -30,10 +31,19 @@ var (
 )
 
 const (
-	testCatalogRef  = "localhost/testdata/catalogs/test-catalog:e2e"
-	testCatalogName = "test-catalog"
+	testCatalogRefEnvVar  = "TEST_CATALOG_IMAGE"
+	testCatalogRefDefault = "localhost/testdata/catalogs/test-catalog:e2e"
+	testCatalogName       = "test-catalog"
 )
 
+// returns the image reference for the test, checking for environment variable substitution, with a default of localhost/testdata/catalogs/test-catalog:e2e
+func getCatalogImageRef() string {
+	if s := os.Getenv(testCatalogRefEnvVar); s != "" {
+		return s
+	}
+	return testCatalogRefDefault
+}
+
 func TestE2E(t *testing.T) {
 	RegisterFailHandler(Fail)
 	SetDefaultEventuallyTimeout(1 * time.Minute)
@@ -55,7 +65,7 @@ var _ = BeforeSuite(func() {
 	Expect(err).To(Not(HaveOccurred()))
 
 	ctx := context.Background()
-	operatorCatalog, err = createTestCatalog(ctx, testCatalogName, testCatalogRef)
+	operatorCatalog, err = createTestCatalog(ctx, testCatalogName, getCatalogImageRef())
 	Expect(err).ToNot(HaveOccurred())
 
 	Eventually(func(g Gomega) {

test/e2e/install_test.go

@@ -147,7 +147,7 @@ var _ = Describe("Operator Install", func() {
 
 			By("creating an Operator catalog with the desired package")
 			var err error
-			operatorCatalog, err = createTestCatalog(ctx, testCatalogName, testCatalogRef)
+			operatorCatalog, err = createTestCatalog(ctx, testCatalogName, getCatalogImageRef())
 			Expect(err).ToNot(HaveOccurred())
 			Eventually(func(g Gomega) {
 				g.Expect(c.Get(ctx, types.NamespacedName{Name: operatorCatalog.Name}, operatorCatalog)).To(Succeed())