org.scalatestexamples.funsuite.WithTempFileExampleSuite.scala Maven / Gradle / Ivy

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ScalaTest is a free, open-source testing toolkit for Scala and Java programmers.

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/*
 * Copyright 2001-2009 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.funsuite

import org.scalatestexamples._
import org.scalatest.FunSuite
import java.io.FileReader
import java.io.FileWriter
import java.io.File

class WithTempFileExampleSuite extends FunSuite {

  def withTempFile(testFunction: FileReader => Unit) {

    val FileName = "TempFile.txt"

    // Set up the temp file needed by the test
    val writer = new FileWriter(FileName)
    try {
      writer.write("Hello, test!")
    }
    finally {
      writer.close()
    }

    // Create the reader needed by the test
    val reader = new FileReader(FileName)

    try {
      // Run the test using the temp file
      testFunction(reader)
    }
    finally {
      // Close and delete the temp file
      reader.close()
      val file = new File(FileName)
      file.delete()
    }
  }

  test("reading from the temp file") {
    withTempFile { (reader) =>
      var builder = new StringBuilder
      var c = reader.read()
      while (c != -1) {
        builder.append(c.toChar)
        c = reader.read()
      }
      assert(builder.toString === "Hello, test!")
    }
  }

  test("first char of the temp file") {
    withTempFile { (reader) =>
      assert(reader.read() === 'H')
    }
  }
}