Increase test coverage

internal/providers/factory.go

@@ -31,10 +31,16 @@ func (f *ProviderFactory) CreateProvider(issuerURL string) (OIDCProvider, error)
 		return nil, fmt.Errorf("issuer URL cannot be empty")
 	}
 
-	if _, err := url.Parse(issuerURL); err != nil {
+	parsedURL, err := url.Parse(issuerURL)
+	if err != nil {
 		return nil, fmt.Errorf("invalid issuer URL format: %w", err)
 	}
 
+	// Check if the URL has a valid scheme and host
+	if parsedURL.Scheme == "" || parsedURL.Host == "" {
+		return nil, fmt.Errorf("invalid issuer URL format: URL must have a valid scheme and host")
+	}
+
 	provider := f.registry.DetectProvider(issuerURL)
 	if provider == nil {
 		return nil, fmt.Errorf("unable to detect provider for issuer URL: %s", issuerURL)
@@ -100,6 +106,11 @@ func (f *ProviderFactory) IsProviderSupported(issuerURL string) bool {
 		return false
 	}
 
+	// Check if the URL has a valid scheme and host
+	if normalizedURL.Scheme == "" || normalizedURL.Host == "" {
+		return false
+	}
+
 	host := strings.ToLower(normalizedURL.Host)
 	supportedProviders := f.GetSupportedProviders()