Replace texttest fixture with own acceptance test

src/test/kotlin/com/gildedrose/TexttestFixture.kt

@@ -1,36 +0,0 @@
-package com.gildedrose
-
-fun main(args: Array<String>) {
-
-    println("OMGHAI!")
-
-    val items = arrayOf(Item("+5 Dexterity Vest", 10, 20), //
-            Item("Aged Brie", 2, 0), //
-            Item("Elixir of the Mongoose", 5, 7), //
-            Item("Sulfuras, Hand of Ragnaros", 0, 80), //
-            Item("Sulfuras, Hand of Ragnaros", -1, 80),
-            Item("Backstage passes to a TAFKAL80ETC concert", 15, 20),
-            Item("Backstage passes to a TAFKAL80ETC concert", 10, 49),
-            Item("Backstage passes to a TAFKAL80ETC concert", 5, 49),
-            // this conjured item does not work properly yet
-            Item("Conjured Mana Cake", 3, 6))
-
-    val app = GildedRose(items)
-
-    var days = 2
-    if (args.size > 0) {
-        days = Integer.parseInt(args[0]) + 1
-    }
-
-    for (i in 0..days - 1) {
-        println("-------- day $i --------")
-        println("name, sellIn, quality")
-        for (item in items) {
-            println(item)
-        }
-        println()
-        app.updateQuality()
-    }
-
-
-}

src/test/kotlin/com/gildedrose/acceptance/ThirtyDaysAcceptanceTests.kt

@@ -0,0 +1,50 @@
+package com.gildedrose.acceptance
+
+import com.gildedrose.GildedRose
+import com.gildedrose.Item
+import com.gildedrose.core.TestToFileHandler
+import org.junit.Assert.assertEquals
+import org.junit.Test
+
+class ThirtyDaysAcceptanceTests {
+
+    private val testToFileHandler = TestToFileHandler("ThirtyDays")
+
+    @Test
+    fun withInitialTextFixture_whenRunForThirtyDays_itShouldHaveSameOutputAsLegacyCode() {
+        val initialTextFixture = arrayOf(
+                Item("+5 Dexterity Vest", 10, 20), //
+                Item("Aged Brie", 2, 0), //
+                Item("Elixir of the Mongoose", 5, 7), //
+                Item("Sulfuras, Hand of Ragnaros", 0, 80), //
+                Item("Sulfuras, Hand of Ragnaros", -1, 80),
+                Item("Backstage passes to a TAFKAL80ETC concert", 15, 20),
+                Item("Backstage passes to a TAFKAL80ETC concert", 10, 49),
+                Item("Backstage passes to a TAFKAL80ETC concert", 5, 49),
+                // this conjured item does not work properly yet
+                Item("Conjured Mana Cake", 3, 6))
+
+        val output = runWithItemsForDays(initialTextFixture, 30)
+
+        assertEquals(output, testToFileHandler.read())
+    }
+
+    private fun runWithItemsForDays(items: Array<Item>, days: Int): String {
+        var output = ""
+
+        val app = GildedRose(items)
+
+        for (i in 0 until days) {
+            output += "\nDAY $i\n"
+
+            items.forEach {
+                val newLine = if (it == items.last()) "" else "\n"
+                output += "$it$newLine"
+            }
+
+            app.updateQuality()
+        }
+
+        return output
+    }
+}

src/test/kotlin/com/gildedrose/core/TestToFileHandler.kt

@@ -0,0 +1,13 @@
+package com.gildedrose.core
+
+import java.io.File
+
+class TestToFileHandler(
+        fileName: String) {
+
+    val filePath = "texttest/$fileName.txt"
+
+    fun write(text: String) = File(filePath).bufferedWriter().use { it.write(text) }
+
+    fun read() = File(filePath).bufferedReader().readLines().joinToString(separator = "\n")
+}