org.scalatestexamples.matchers.ShouldStackSpec.scala Maven / Gradle / Ivy

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/*
 * Copyright 2001-2008 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.scalatestexamples.matchers

import org.scalatestexamples._
import org.scalatest.FunSpec
import org.scalatest.matchers.ShouldMatchers
import scala.collection.mutable.ListBuffer
import org.scalatestexamples.helpers.Stack
import org.scalatestexamples.helpers.Stack

trait ShouldStackBehaviors extends ShouldMatchers { this: FunSpec =>

  val full = 'full
  val empty = 'empty

  def nonEmptyStack(lastItemAdded: Int)(stack: Stack[Int]) {

    it("should be non-empty") {
      stack should not { be (empty) }
    }  

    it("should return the top item on peek") {
      stack.peek should equal (lastItemAdded)
    }
  
    it("should not remove the top item on peek") {
      val size = stack.size
      stack.peek should equal (lastItemAdded)
      stack.size should equal (size)
    }
  
    it("should remove the top item on pop") {
      val size = stack.size
      stack.pop should equal (lastItemAdded)
      stack.size should equal (size - 1)
    }
  }
  
  def nonFullStack(stack: Stack[Int]) {
      
    it("should not be full") {
      stack should not { be (full) }
    }

    it("should add to the top on push") {
      val size = stack.size
      stack.push(7)
      stack.size should equal (size + 1)
      stack.peek should equal (7)
    }
  }
}

class ShouldStackSpec extends FunSpec with ShouldMatchers with StackFixtureCreationMethods with ShouldStackBehaviors {

  info("Before the first behavior of shorthand")

  describe("A Stack") {

    describe("(when empty)") {
      
      it("should be empty") {
        emptyStack should be (empty)
        info("Inside the first test")
      }

      info("After the first behavior of shorthand")

      it("should complain on peek") {
        intercept[IllegalStateException] {
          emptyStack.peek
        }
      }

      it("should complain on pop") {
        intercept[IllegalStateException] {
          emptyStack.pop
        }
      }
    }

    describe("(with one item)") {
      it should behave like nonEmptyStack(lastValuePushed)(stackWithOneItem) 
      it should behave like nonFullStack(stackWithOneItem) 
    }
    
    describe("(with one item less than capacity)") {
      it should behave like nonEmptyStack(lastValuePushed)(stackWithOneItemLessThanCapacity) 
      it should behave like nonFullStack(stackWithOneItemLessThanCapacity) 
    }

    describe("(full)") {
      
      // fullStack should be full  .... could I get this to print the message "- should be full" ?
      it("should be full") {
        fullStack should be (full)
      }
      
      it should behave like nonEmptyStack(lastValuePushed)(fullStack) 

      it("should complain on a push") {
        intercept[IllegalStateException] {
          fullStack.push(10)
        }
      }
    }
  }
}