Add Stringer interface to provisioner.Type.

Add missing file.

authority/provisioner/provisioner.go

@@ -89,6 +89,24 @@ const (
 	SignAudienceKey = "sign"
 )
 
+// String returns the string representation of the type.
+func (t Type) String() string {
+	switch t {
+	case TypeJWK:
+		return "JWK"
+	case TypeOIDC:
+		return "OIDC"
+	case TypeGCP:
+		return "GCP"
+	case TypeAWS:
+		return "AWS"
+	case TypeAzure:
+		return "Azure"
+	default:
+		return ""
+	}
+}
+
 // Config defines the default parameters used in the initialization of
 // provisioners.
 type Config struct {

authority/provisioner/provisioner_test.go

@@ -0,0 +1,26 @@
+package provisioner
+
+import "testing"
+
+func TestType_String(t *testing.T) {
+	tests := []struct {
+		name string
+		t    Type
+		want string
+	}{
+		{"JWK", TypeJWK, "JWK"},
+		{"OIDC", TypeOIDC, "OIDC"},
+		{"AWS", TypeAWS, "AWS"},
+		{"Azure", TypeAzure, "Azure"},
+		{"GCP", TypeGCP, "GCP"},
+		{"noop", noopType, ""},
+		{"notFound", 1000, ""},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			if got := tt.t.String(); got != tt.want {
+				t.Errorf("Type.String() = %v, want %v", got, tt.want)
+			}
+		})
+	}
+}