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ScalaTest is a free, open-source testing toolkit for Scala and Java programmers.
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/*
 * Copyright 2001-2013 Artima, 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 org.scalatest

/**
 * A Suite class that takes zero to many Suites,
 * which will be returned from its nestedSuites method and
 * executed in “stepwise” fashion by its runNestedSuites method.
 *
 * 
 * For example, you can define a suite that always executes a list of
 * nested suites like this:
 * 
 *
 *  * class StepsSuite extends Stepwise(
 *   new Step1Suite,
 *   new Step2Suite,
 *   new Step3Suite,
 *   new Step4Suite,
 *   new Step5Suite
 * )
 * 
 *
 * 
 * When StepsSuite is executed, regardless of whether a Distributor
 * is passed, it will execute its
 * nested suites sequentially in the passed order: Step1Suite, Step2Suite,
 * Step3Suite, Step4Suite, and Step5Suite.
 * 
 *
 * 
 * The difference between Stepwise and Sequential
 * is that although Stepwise executes its own nested suites sequentially, it passes
 * whatever distributor was passed to it to those nested suites. Thus the nested suites could run their own nested
 * suites and tests in parallel if that distributor is defined. By contrast, Sequential always
 * passes None for the distributor to the nested suites, so any and every test and nested suite 
 * contained within the nested suites passed to the Sequential construtor will be executed sequentially.
 * 
 * 
 * @param suitesToNest a sequence of Suites to nest.
 *
 * @throws NullPointerException if suitesToNest, or any suite
 * it contains, is null.
 *
 * @author Bill Venners
 */
class Stepwise(suitesToNest: Suite*) extends Suite with StepwiseNestedSuiteExecution { thisSuite => 

  for (s <- suitesToNest) {
    if (s == null)
      throw new NullPointerException("A passed suite was null")
  }

  /**
   * Returns an immutable IndexedSeq containing the suites passed to the constructor in
   * the order they were passed.
   */
  override val nestedSuites: collection.immutable.IndexedSeq[Suite] = Vector.empty ++ suitesToNest

  /**
   * Returns a user friendly string for this suite, composed of the
   * simple name of the class (possibly simplified further by removing dollar signs if added by the Scala interpeter) and, if this suite
   * contains nested suites, the result of invoking toString on each
   * of the nested suites, separated by commas and surrounded by parentheses.
   *
   * @return a user-friendly string for this suite
   */
  override def toString: String = Suite.suiteToString(None, thisSuite)
}

/**
 * Companion object to class Stepwise that offers an apply factory method
 * for creating a Stepwise instance.
 *
 * 
 * One use case for this object is to run multiple specification-style suites in the Scala interpreter, like this:
 * 
 *
 *  * scala> Stepwise(new MyFirstSuite, new MyNextSuite).execute()
 * 
 */
object Stepwise {

  /**
   * Factory method for creating a Stepwise instance.
   */
  def apply(suitesToNest: Suite*): Stepwise = new Stepwise(suitesToNest: _*)
}