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Testing Knot.x with JUnit 5

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/*
 * Copyright (C) 2018 Knot.x Project
 *
 * 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 io.knotx.junit5.util;

import io.reactivex.Single;
import io.reactivex.functions.Consumer;
import io.vertx.junit5.VertxTestContext;

public final class RequestUtil {

  /**
   * Util class
   */
  private RequestUtil() {
  }

  /**
   * Safely execute onError handler on given result, passing checks to given test context
   *
   * @param context test context
   * @param result to which subscribe
   * @param onError result handler, can throw exceptions
   * @param  result type to process, irrelevant here
   */
  public static  void subscribeToResult_shouldFail(
      VertxTestContext context, Single result, Consumer onError) {
    result
        .subscribe(
            response -> context.failNow(new AssertionError("Error should occur")),
            error -> {
              try {
                onError.accept(error);
                context.completeNow();
              } catch (Exception | AssertionError t) {
                context.failNow(t);
              }
            });
  }

  /**
   * Safely execute assertions on given result, passing checks to given test context
   *
   * @param context test context
   * @param result to which subscribe
   * @param assertions result handler, can throw exceptions
   * @param  result type to process, assertions must accept the same type
   */
  public static  void subscribeToResult_shouldSucceed(
      VertxTestContext context, Single result, Consumer assertions) {
    result.doOnSuccess(assertions).subscribe(response -> context.completeNow(), context::failNow);
  }
}