Merge 5c0a645fd3 into c6cad5bf8d

Java/com/gildedrose/GildedRose.java

@@ -1,5 +1,10 @@
 package com.gildedrose;
 
+import java.util.Arrays;
+import java.util.LinkedList;
+
+import static java.util.stream.Collectors.toList;
+
 class GildedRose {
     Item[] items;
 
@@ -59,4 +64,10 @@ class GildedRose {
             }
         }
     }
+
+    @Override
+    public String toString()
+    {
+        return Arrays.toString(items);
+    }
 }

Java/com/gildedrose/GildedRoseTest.java

@@ -1,17 +1,84 @@
 package com.gildedrose;
 
+import static java.lang.Integer.*;
+import static java.lang.Integer.MIN_VALUE;
+import static java.util.function.Function.identity;
 import static org.junit.Assert.*;
 
+import org.approvaltests.legacycode.LegacyApprovals;
+import org.approvaltests.reporters.DiffReporter;
+import org.approvaltests.reporters.JunitReporter;
+import org.approvaltests.reporters.UseReporter;
 import org.junit.Test;
 
+import java.util.Arrays;
+import java.util.function.Function;
+import java.util.stream.Stream;
+
+@UseReporter(JunitReporter.class)
 public class GildedRoseTest {
 
+    Stream<String> ODD_ITEM_NAMES = Σ("", "pie", "foo");
+    Stream<String> KNOWN_ITEM_NAMES =
+         Σ("Aged Brie",
+           "Elixir of the Mongoose",
+           "Sulfuras, Hand of Ragnaros",
+           "Backstage passes to a TAFKAL80ETC concert");
+    Stream<String> UNKNOWN_ITEM_NAMES = Σ("+5 Dexterity Vest", "Conjured Mana Cake");
+
+    Stream<Integer> MIN_DAYS =                Σ(MIN_VALUE);
+    Stream<Integer> DAYS_NEAR_ZERO =          Σ(-1,0,1);
+    Stream<Integer> SINGLE_DIGIT_DAYS =       Σ(4,5,6);
+    Stream<Integer> LOW_DOUBLE_DIGIT_DAYS =   Σ(10,11,12);
+    Stream<Integer> HIGH_DOUBLE_DIGIT_DAYS =  Σ(99_999,100_000,100_001);
+    Stream<Integer> MAX_DAYS =                Σ(MAX_VALUE);
+
+    Stream<Integer> MINIMUM_QUALITY =         Σ(0);
+    Stream<Integer> SINGLE_DIGIT_QUALITIES =  Σ(1,2,3,4,5);
+    Stream<Integer> DOUBLE_DIGIT_QUALITIES =  Σ(12,13,15);
+    Stream<Integer> QUALITIES_NEAR_MAXIMUM =  Σ(47,48,49);
+    Stream<Integer> MAXIMUM_QUALITY =         Σ(50);
+    Stream<Integer> LEGENDARY_ITEM_QUALITY =  Σ(80);
+
+    Stream<String>  GOOD_MIX_OF_ITEM_NAMES =
+            ⁀(ODD_ITEM_NAMES, KNOWN_ITEM_NAMES, UNKNOWN_ITEM_NAMES);
+    Stream<Integer> GOOD_MIX_OF_NUMBER_OF_DAYS_BY_WHICH_TO_SELL_ITEM =
+            ⁀(MIN_DAYS, DAYS_NEAR_ZERO, SINGLE_DIGIT_DAYS, LOW_DOUBLE_DIGIT_DAYS, HIGH_DOUBLE_DIGIT_DAYS, MAX_DAYS);
+    Stream<Integer> GOOD_MIX_OF_ITEM_QUALITY_LEVELS =
+            ⁀(MINIMUM_QUALITY, SINGLE_DIGIT_QUALITIES, DOUBLE_DIGIT_QUALITIES, QUALITIES_NEAR_MAXIMUM, MAXIMUM_QUALITY, LEGENDARY_ITEM_QUALITY);
+
     @Test
     public void foo() {
-        Item[] items = new Item[] { new Item("foo", 0, 0) };
-        GildedRose app = new GildedRose(items);
-        app.updateQuality();
+        String name = "foo";
+        int sellIn = 0;
+        int quality = 0;
+        GildedRose app = updateQuality(name, sellIn, quality);
         assertEquals("fixme", app.items[0].name);
     }
 
+    @Test
+    public void regression_test() throws Exception
+    {
+        LegacyApprovals.LockDown(
+            this,
+            "updateQuality",
+            GOOD_MIX_OF_ITEM_NAMES.toArray(),
+            GOOD_MIX_OF_NUMBER_OF_DAYS_BY_WHICH_TO_SELL_ITEM.toArray(),
+            GOOD_MIX_OF_ITEM_QUALITY_LEVELS.toArray());
+    }
+
+    public GildedRose updateQuality(String name, Integer sellIn, Integer quality)
+    {
+        Item[] items = new Item[] { new Item(name, sellIn, quality) };
+        GildedRose app = new GildedRose(items);
+        app.updateQuality();
+        return app;
+    }
+
+    // Create a stream of As
+    private <A> Stream<A> Σ(A... As){ return Arrays.stream(As); }
+
+    // concatenate streams of As
+    private <A> Stream<A> ⁀(Stream<A>... streams) { return Arrays.stream(streams).flatMap( Function.identity() ); }
+
 }