feat: on malformed error response, ensure more context

routingv8/client.go

@@ -52,6 +52,13 @@ type ResponseError struct {
 }
 
 func (r *ResponseError) Error() string {
+	if r.Response == nil || r.Response.Status == 0 {
+		return fmt.Sprintf(
+			"Response: %s StatusCode: %d",
+			r.HTTPBody,
+			r.HTTPStatusCode,
+		)
+	}
 	return fmt.Sprintf(
 		"Title: %v, Status: %d, Code: %v, Cause: %v, Action: %v",
 		r.Response.Title,

routingv8/client_test.go

@@ -0,0 +1,50 @@
+package routingv8_test
+
+import (
+	"testing"
+
+	"go.einride.tech/here/routingv8"
+	"gotest.tools/v3/assert"
+)
+
+func TestRouteError(t *testing.T) {
+	t.Parallel()
+	for _, tt := range []*struct {
+		name                string
+		expectedErrorString string
+		responseError       routingv8.ResponseError
+	}{
+		{
+			name: "normally serialized",
+			responseError: routingv8.ResponseError{
+				Response: &routingv8.HereErrorResponse{
+					Title:  "Unknown",
+					Status: 500,
+					Code:   "ErrorCode",
+					Cause:  "Random Cause",
+					Action: "Do it right",
+				},
+			},
+			expectedErrorString: "Title: Unknown, Status: 500, Code: ErrorCode, Cause: Random Cause, Action: Do it right",
+		},
+		{
+			name: "response not present",
+			responseError: routingv8.ResponseError{
+				HTTPBody: "{}",
+			},
+			expectedErrorString: "Response: {} StatusCode: 0",
+		},
+		{
+			name: "response malformed",
+			responseError: routingv8.ResponseError{
+				Response: &routingv8.HereErrorResponse{},
+				HTTPBody: "{}",
+			},
+			expectedErrorString: "Response: {} StatusCode: 0",
+		},
+	} {
+		t.Run(tt.name, func(t *testing.T) {
+			assert.Equal(t, tt.responseError.Error(), tt.expectedErrorString)
+		})
+	}
+}