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CSVReaderSpec.scala
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CSVReaderSpec.scala
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package com.github.tototoshi.csv
import java.io.{ FileReader, File }
import org.scalatest.FunSpec
import org.scalatest.matchers._
import javax.swing.colorchooser.DefaultColorSelectionModel
class CSVReaderSpec extends FunSpec with ShouldMatchers with Using {
def fixture = new {
}
describe("CSVReader") {
describe ("#apply") {
it ("should close csv reader") {
val reader = CSVReader.open("src/test/resources/simple.csv")
reader.apply { lines => () }
intercept[java.io.IOException] {
reader.readNext()
}
}
}
it("should be constructed with java.io.File") {
var res: List[String] = Nil
using (CSVReader.open(new File("src/test/resources/simple.csv"))) { reader =>
reader foreach { fields =>
res = res ++ fields
}
}
res.mkString should be ("abcdef")
}
it("should be constructed with filename") {
var res: List[String] = Nil
using (CSVReader.open("src/test/resources/simple.csv")) { reader =>
reader foreach { fields =>
res = res ++ fields
}
}
res.mkString should be ("abcdef")
}
it("should be constructed with separators") {
var res: List[String] = Nil
implicit object format extends DefaultCSVFormat {
override val separator: Char = '#'
}
using (CSVReader.open("src/test/resources/hash-separated.csv")) { reader =>
reader foreach { fields =>
res = res ++ fields
}
}
res.mkString should be ("abcdef")
}
it("should be consutrcted with separators and quotes") {
implicit object format extends DefaultCSVFormat {
override val separator: Char = '#'
override val quoteChar: Char = '$'
}
using (CSVReader.open("src/test/resources/hash-separated-dollar-quote.csv")) { reader => {
val map = reader.allWithHeaders()
map(0)("Foo ") should be ("a")
}
}
}
it("read CSV from file") {
var res: List[String] = Nil
using (CSVReader.open(new FileReader("src/test/resources/simple.csv"))) { reader =>
reader foreach { fields =>
res = res ++ fields
}
}
res.mkString should be ("abcdef")
}
it("has #toStream") {
using (CSVReader.open(new File("src/test/resources/simple.csv"))) { reader =>
val stream = reader.toStream
stream.drop(1).head.mkString should be ("def")
}
}
it("has #readNext") {
using (CSVReader.open(new File("src/test/resources/simple.csv"))) { reader =>
reader.readNext()
reader.readNext.get.mkString should be ("def")
}
}
it("has #all") {
using (CSVReader.open(new FileReader("src/test/resources/simple.csv"))) { reader =>
reader.all should be (List(List("a", "b", "c"), List("d", "e", "f")))
}
}
describe("iterator fetched from #iterator") {
it ("has #hasNext") {
using (CSVReader.open("src/test/resources/simple.csv")) { reader =>
val it = reader.iterator
it.hasNext should be (true)
it.hasNext should be (true)
it.hasNext should be (true)
it.foreach(x => ()) // cosume
it.hasNext should be (false)
}
}
describe ("#next") {
it ("should return the next line") {
using (CSVReader.open("src/test/resources/simple.csv")) { reader =>
val it = reader.iterator
it.next should be (List("a", "b", "c"))
it.next should be (List("d", "e", "f"))
}
}
it ("should throw NoSuchElementException") {
using (CSVReader.open("src/test/resources/simple.csv")) { reader =>
val it = reader.iterator
it.next
it.next
intercept[java.util.NoSuchElementException] {
it.next
}
}
}
}
it ("iterate all lines") {
var lineCount = 0
using (CSVReader.open("src/test/resources/simple.csv")) { reader =>
val it = reader.iterator
it.foreach { line => lineCount += 1 }
}
lineCount should be (2)
}
describe ("When the file to be parsed is huge") {
it ("should iterate all lines without any trouble") {
val tmpfile: File = File.createTempFile("csv", "test")
tmpfile.deleteOnExit()
using(new java.io.PrintWriter(tmpfile)) { writer =>
(1 to 100000).foreach { i =>
writer.println(i)
}
}
var count = 0
using (CSVReader.open(tmpfile)) { reader =>
reader.foreach { row =>
count += 1
}
}
count should be (100000)
}
}
}
describe("#allHeaders") {
describe("When the file is empty") {
it("returns an empty list") {
using (CSVReader.open(new FileReader("src/test/resources/empty.csv"))) { reader =>
reader.allWithHeaders should be('empty)
}
}
}
describe("When the file has only one line") {
it("returns an empty list") {
using (CSVReader.open(new FileReader("src/test/resources/only-header.csv"))) { reader =>
reader.allWithHeaders should be('empty)
}
}
}
describe("When the file has many lines") {
it("returns a List of Map[String, String]") {
using (CSVReader.open(new FileReader("src/test/resources/with-headers.csv"))) { reader =>
reader.allWithHeaders should be (List(Map("Foo" -> "a", "Bar" -> "b", "Baz" -> "c"), Map("Foo" -> "d", "Bar" -> "e", "Baz" -> "f")))
}
}
}
}
}
}