Workaround native image params issue (#6401)

okhttp-testing-support/src/main/kotlin/okhttp3/SimpleProvider.kt

@@ -0,0 +1,27 @@
+/*
+ * Copyright (C) 2020 Square, Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package okhttp3
+
+import org.junit.jupiter.api.extension.ExtensionContext
+import org.junit.jupiter.params.provider.Arguments
+import org.junit.jupiter.params.provider.ArgumentsProvider
+
+abstract class SimpleProvider: ArgumentsProvider {
+  override fun provideArguments(context: ExtensionContext) =
+    arguments().map { Arguments.of(it) }.stream()
+
+  abstract fun arguments(): List<Any>
+}