1 files changed, 61 insertions, 0 deletions
diff --git a/pkg/oauthflow/pkce_test.go b/pkg/oauthflow/pkce_test.go
new file mode 100644
index 0000000..4872b78
--- /dev/null
+++ b/pkg/oauthflow/pkce_test.go
@@ -0,0 +1,61 @@
+//
+// Copyright 2021 The Sigstore 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.
+
+package oauthflow
+
+import (
+	"context"
+	"fmt"
+	"testing"
+
+	"github.com/coreos/go-oidc/v3/oidc"
+)
+
+func TestProviderIsAzureBacked(t *testing.T) {
+	actualAzureProviders := []string{
+		"https://login.microsoftonline.com/6babcaad-604b-40ac-a9d7-9fd97c0b779f/v2.0",
+	}
+
+	notAzureProviders := []string{
+		"https://accounts.google.com",
+		"https://login.salesforce.com",
+	}
+	for _, tc := range actualAzureProviders {
+		t.Run(fmt.Sprintf("testing azure provider %v", tc), func(t *testing.T) {
+			p, err := oidc.NewProvider(context.Background(), tc)
+			if err != nil {
+				t.Error(err)
+			}
+			if !providerIsAzureBacked(p) {
+				t.Errorf("valid azure provider URL %v was not detected as being azure backed", tc)
+			}
+		})
+	}
+	for _, tc := range notAzureProviders {
+		t.Run(fmt.Sprintf("testing invalid azure provider %v", tc), func(t *testing.T) {
+			p, err := oidc.NewProvider(context.Background(), tc)
+			if err != nil {
+				t.Error(err)
+			}
+			if providerIsAzureBacked(p) {
+				t.Errorf("invalid azure provider URL %v was detected as being azure backed", tc)
+			}
+		})
+	}
+
+	if providerIsAzureBacked(nil) != false {
+		t.Errorf("nil provider should not return true for being Azure-backed")
+	}
+}