Add unit tests for limits of quality

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

@@ -1,7 +1,6 @@
 package com.gildedrose
 
 import com.gildedrose.core.TestUtils
-import com.gildedrose.core.TestUtils.generateRandomName
 import com.gildedrose.core.TestUtils.generateRandomNumber
 import com.gildedrose.core.TestUtils.pickRandomItem
 import com.gildedrose.core.advanceTimeBy
@@ -11,15 +10,36 @@ import org.junit.Test
 
 class QualityTest {
 
-    private lateinit var store: Array<Item>
+    private lateinit var store: List<Item>
 
     @Before
     fun setUp() {
-        store = TestUtils.fixture
+        store = TestUtils.fixture.toList()
     }
 
     @Test
-    fun name() {
+    fun givenKnownItemExcepSulfuras_afterAnyNumberOfDays_shouldHaveQualityGreaterThanOrEqualToZero() {
-        throw UnsupportedOperationException()
+        val days = generateRandomNumber()
+        store = store.filter { it.name != "Sulfuras, Hand of Ragnaros" }
+        val app = GildedRose(store.toTypedArray())
+
+        app.advanceTimeBy(days)
+
+        store.forEach {item ->
+            assertThat(item.quality).isGreaterThanOrEqualTo(0)
+        }
+    }
+
+    @Test
+    fun givenKnownItemExcepSulfuras_afterAnyNumberOfDays_shouldHaveQualityLessThanOrEqualToFifty() {
+        val days = generateRandomNumber()
+        store = store.filter { it.name != "Sulfuras, Hand of Ragnaros" }
+        val app = GildedRose(store.toTypedArray())
+
+        app.advanceTimeBy(days)
+
+        store.forEach {item ->
+            assertThat(item.quality).isLessThanOrEqualTo(50)
+        }
     }
 }