Add new file ClosetTest

ClosetTest.java

+import org.junit.Test;
+import static org.junit.Assert.*;
+
+public class ClosetTest {
+
+    @Test
+    public void testCloset() {
+        Closet myCloset = new MyCloset();
+        Clothing sweater1 = new Clothing("Red", "M");
+        Clothing sweater2 = new Clothing("Blue", "S");
+        Clothing pants1 = new Clothing("Black", "L");
+        Clothing pants2 = new Clothing("Blue", "S");
+
+        myCloset.addClothing(sweater1);
+        myCloset.addClothing(pants1);
+
+        assertTrue(myCloset.hasClothing(sweater1));
+        assertFalse(myCloset.hasClothing(sweater2));
+        assertTrue(myCloset.hasClothing(pants1));
+        assertFalse(myCloset.hasClothing(pants2));
+    }
+}