Reproduce issue getkin#624

Signed-off-by: Pierre Fenoll <pierrefenoll@gmail.com>

openapi3filter/issue624_test.go

@@ -0,0 +1,65 @@
+package openapi3filter
+
+import (
+	"context"
+	"net/http"
+	"testing"
+
+	"github.com/stretchr/testify/require"
+
+	"github.com/getkin/kin-openapi/openapi3"
+	"github.com/getkin/kin-openapi/routers/gorillamux"
+)
+
+func TestIssue624(t *testing.T) {
+	ctx := context.Background()
+	loader := &openapi3.Loader{Context: ctx, IsExternalRefsAllowed: true}
+	spec := `
+openapi: 3.0.0
+info:
+  version: 1.0.0
+  title: Sample API
+paths:
+  /items:
+    get:
+      description: Returns a list of stuff
+      parameters:
+      - description: "test non object"
+        explode: true
+        style: form
+        in: query
+        name: test
+        required: false
+        content:
+          application/json:
+            schema:
+              anyOf:
+              - type: string
+              - type: integer
+      responses:
+        '200':
+          description: Successful response
+`[1:]
+
+	doc, err := loader.LoadFromData([]byte(spec))
+	require.NoError(t, err)
+
+	err = doc.Validate(ctx)
+	require.NoError(t, err)
+
+	router, err := gorillamux.NewRouter(doc)
+	require.NoError(t, err)
+	httpReq, err := http.NewRequest(http.MethodGet, `/items?test=test1`, nil)
+	require.NoError(t, err)
+
+	route, pathParams, err := router.FindRoute(httpReq)
+	require.NoError(t, err)
+
+	requestValidationInput := &RequestValidationInput{
+		Request:    httpReq,
+		PathParams: pathParams,
+		Route:      route,
+	}
+	err = ValidateRequest(ctx, requestValidationInput)
+	require.NoError(t, err)
+}