Add --https flag for e2e tests

test/README.md

@@ -67,6 +67,14 @@ mode, use
 test/local-e2e-tests.sh -short
 ```
 
+### Running tests with HTTPS
+
+When running tests against a cluster configured to use HTTPS, use the `--https` flag to make tests expect HTTPS URLs:
+
+```bash
+ test/local-e2e-tests.sh --https
+```
+
 ### Running E2E tests as a project admin
 
 It is possible to run the E2E tests by a user with reduced privileges, e.g. project admin.

test/e2e/domain_mapping_test.go

@@ -146,7 +146,8 @@ func domainDescribe(r *test.KnRunResultCollector, domainName string, tls bool) {
 	out := r.KnTest().Kn().Run("domain", "describe", domainName)
 	r.AssertNoError(out)
 	var url string
-	if tls {
+	// Use HTTPS if either TLS is explicitly configured or the --https flag is set
+	if tls || ClientFlags.HTTPS {
 		url = "https://" + domainName
 	} else {
 		url = "http://" + domainName

test/e2e/e2e_flags.go

@@ -0,0 +1,41 @@
+/*
+Copyright 2025 The Knative Authors
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+// This file contains logic to encapsulate flags which are needed to specify
+// what cluster, etc. to use for e2e tests.
+
+package e2e
+
+import (
+	"flag"
+
+	_ "knative.dev/pkg/test"
+)
+
+var ClientFlags = initializeClientFlags()
+
+type ClientEnvironmentFlags struct {
+	HTTPS bool
+}
+
+func initializeClientFlags() *ClientEnvironmentFlags {
+	var f ClientEnvironmentFlags
+
+	flag.BoolVar(&f.HTTPS, "https", false,
+		"Set this flag to true to run all tests with https.")
+
+	return &f
+}