added coverage for fixed remote unsupported handler

Signed-off-by: quobix <dave@quobix.com>

index/rolodex_remote_loader.go

@@ -314,15 +314,9 @@ func (i *RemoteFS) Open(remoteURL string) (fs.File, error) {
 		return wait.file, nil
 	}
 
-	processingWaiter := &waiterRemote{f: remoteParsedURL.Path}
-
-	// add to processing
-	i.ProcessingFiles.Store(remoteParsedURL.Path, processingWaiter)
-
 	fileExt := ExtractFileType(remoteParsedURL.Path)
 
 	if fileExt == UNSUPPORTED {
-		i.ProcessingFiles.Delete(remoteParsedURL.Path)
 		i.remoteErrors = append(i.remoteErrors, fs.ErrInvalid)
 		if i.logger != nil {
 			i.logger.Warn("[rolodex remote loader] unsupported file in reference will be ignored", "file", remoteURL, "remoteURL", remoteParsedURL.String())
@@ -330,6 +324,11 @@ func (i *RemoteFS) Open(remoteURL string) (fs.File, error) {
 		return nil, &fs.PathError{Op: "open", Path: remoteURL, Err: fs.ErrInvalid}
 	}
 
+	processingWaiter := &waiterRemote{f: remoteParsedURL.Path}
+
+	// add to processing
+	i.ProcessingFiles.Store(remoteParsedURL.Path, processingWaiter)
+
 	// if the remote URL is absolute (http:// or https://), and we have a rootURL defined, we need to override
 	// the host being defined by this URL, and use the rootURL instead, but keep the path.
 	if i.rootURLParsed != nil {

index/rolodex_remote_loader_test.go

@@ -397,3 +397,14 @@ func TestNewRemoteFS_RemoteBaseURL_EmptySpecFailIndex(t *testing.T) {
 	assert.Error(t, y)
 	assert.Equal(t, "there is nothing in the spec, it's empty - so there is nothing to be done", y.Error())
 }
+
+func TestNewRemoteFS_Unsupported(t *testing.T) {
+
+	cf := CreateOpenAPIIndexConfig()
+	rfs, _ := NewRemoteFSWithConfig(cf)
+
+	x, y := rfs.Open("/woof.png")
+	assert.Nil(t, x)
+	assert.Error(t, y)
+	assert.Equal(t, "open /woof.png: invalid argument", y.Error())
+}