Support range definition for response codes.

ref: https://swagger.io/docs/specification/describing-responses/

responses/validate_body.go

@@ -4,6 +4,7 @@
 package responses
 
 import (
+	"fmt"
 	"net/http"
 	"strconv"
 	"strings"
@@ -47,7 +48,12 @@ func (v *responseBodyValidator) ValidateResponseBody(
 	mediaTypeSting, _, _ := helpers.ExtractContentType(contentType)
 
 	// check if the response code is in the contract
-	foundResponse := operation.Responses.FindResponseByCode(httpCode)
+	foundResponse := operation.Responses.Codes.GetOrZero(fmt.Sprintf("%d", httpCode))
+	if foundResponse == nil {
+		// check range definition for response codes
+		foundResponse = operation.Responses.Codes.GetOrZero(fmt.Sprintf("%dXX", httpCode/100))
+	}
+
 	if foundResponse != nil {
 		if foundResponse.Content != nil { // only validate if we have content types.
 			// check content type has been defined in the contract

validator_test.go

@@ -1170,3 +1170,46 @@ func TestNewValidator_PetStore_PetFindByStatusGet200_Valid_responseOnly(t *testi
 	assert.True(t, valid)
 	assert.Len(t, errors, 0)
 }
+
+func TestNewValidator_ValidateHttpResponse_RangeResponseCode(t *testing.T) {
+
+	spec := `openapi: 3.1.0
+paths:
+  /burgers:
+    get:
+      responses:
+        '200':
+          description: OK
+          content:
+            application/json:
+              schema:
+                type: array
+                items:
+                  type: object
+                  properties:
+                    name:
+                      type: string
+                    patties:
+                      type: integer
+                    vegetarian:
+                      type: boolean
+        '4XX':
+          description: Bad request
+        '5XX':
+          description: Server error`
+
+	doc, _ := libopenapi.NewDocument([]byte(spec))
+
+	v, _ := NewValidator(doc)
+
+	request, _ := http.NewRequest(http.MethodGet, "https://things.com/burgers", nil)
+	request.Header.Set("Content-Type", "application/json")
+	response := &http.Response{
+		StatusCode: 400,
+		Header:     http.Header{"Content-Type": []string{"application/json"}},
+	}
+	valid, errors := v.ValidateHttpResponse(request, response)
+
+	assert.True(t, valid)
+	assert.Len(t, errors, 0)
+}