1 files changed, 112 insertions, 0 deletions
diff --git a/pkg/authn/github/keychain_test.go b/pkg/authn/github/keychain_test.go
new file mode 100644
index 0000000..c3e858a
--- /dev/null
+++ b/pkg/authn/github/keychain_test.go
@@ -0,0 +1,112 @@
+// Copyright 2022 Google LLC All Rights Reserved.
+//
+// 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 github
+
+import (
+	"os"
+	"testing"
+
+	"github.com/google/go-containerregistry/pkg/authn"
+)
+
+// TestKeychain checks that the keychain resolves when $GITHUB_TOKEN is set and
+// the request is for GHCR.
+func TestKeychain(t *testing.T) {
+	username, tok := "octocat", "my-token"
+	os.Setenv("GITHUB_ACTOR", username)
+	os.Setenv("GITHUB_TOKEN", tok)
+	got, err := Keychain.Resolve(resource("ghcr.io/my/repo"))
+	if err != nil {
+		t.Fatalf("Resolve: %v", err)
+	}
+	if got == authn.Anonymous {
+		t.Fatalf("Got anonymous, wanted authenticator")
+	}
+
+	auth, err := got.Authorization()
+	if err != nil {
+		t.Fatalf("Authorization: %v", err)
+	}
+	if auth.Username != username {
+		t.Errorf("Got username %q, want %q", auth.Username, username)
+	}
+	if auth.Password != tok {
+		t.Errorf("Got password %q, want %q", auth.Password, tok)
+	}
+}
+
+// TestKeychainUsernameUnset checks that the keychain resolves an "unset"
+// username when $GITHUB_ACTOR is not set.
+func TestKeychainUsernameUnset(t *testing.T) {
+	tok := "my-token"
+	os.Unsetenv("GITHUB_ACTOR")
+	os.Setenv("GITHUB_TOKEN", tok)
+	got, err := Keychain.Resolve(resource("ghcr.io/my/repo"))
+	if err != nil {
+		t.Fatalf("Resolve: %v", err)
+	}
+	if got == authn.Anonymous {
+		t.Fatalf("Got anonymous, wanted authenticator")
+	}
+
+	auth, err := got.Authorization()
+	if err != nil {
+		t.Fatalf("Authorization: %v", err)
+	}
+	if auth.Username != "unset" {
+		t.Errorf("Got username %q, want unset", auth.Username)
+	}
+	if auth.Password != tok {
+		t.Errorf("Got password %q, want %q", auth.Password, tok)
+	}
+}
+
+// TestKeychainUnset checks that the keychain doesn't resolve when the
+// environment variable is unset.
+func TestKeychainUnset(t *testing.T) {
+	os.Unsetenv("GITHUB_TOKEN")
+
+	got, err := Keychain.Resolve(resource("ghcr.io/my/repo"))
+	if err != nil {
+		t.Fatalf("Resolve: %v", err)
+	}
+	if got != authn.Anonymous {
+		t.Errorf("Resolve(ghcr.io) got %v, want Anonymous", got)
+	}
+}
+
+// TestNoMatch checks that the keychain doesn't resolve for non-GHCR registries.
+func TestNoMatch(t *testing.T) {
+	os.Setenv("GITHUB_TOKEN", "my-token")
+	for _, s := range []string{
+		"gcr.io",
+		"example.com",
+		"ghcr.io.example.com",
+		"invalid-domain-name -- %U)(@*)(%*)@(*#%@",
+	} {
+		got, err := Keychain.Resolve(resource(s))
+		if err != nil {
+			t.Fatalf("Resolve: %v", err)
+		}
+		if got != authn.Anonymous {
+			t.Errorf("Resolve(%q) got %v, want Anonymous", s, got)
+		}
+	}
+}
+
+type resource string
+
+func (r resource) String() string      { return string(r) }
+func (r resource) RegistryStr() string { return string(r) }