Merge pull request #381 from superklamer/FlattenerTest

#379 flatten-array: add @Ignore to tests

exercises/flatten-array/src/test/java/FlattenerTest.java

@@ -1,5 +1,6 @@
 import org.junit.Before;
 import org.junit.Test;
+import org.junit.Ignore;
 
 import static java.util.Arrays.asList;
 import static java.util.Collections.emptyList;
@@ -32,6 +33,7 @@ public final class FlattenerTest {
               8)));
     }
 
+    @Ignore
     @Test
     public void testFiveLevelsOfNestingWithNoNulls() {
         assertEquals(
@@ -54,6 +56,7 @@ public final class FlattenerTest {
               "-2")));
     }
 
+    @Ignore
     @Test
     public void testSixLevelsOfNestingWithNoNulls() {
         assertEquals(
@@ -76,6 +79,7 @@ public final class FlattenerTest {
               "8")));
     }
 
+    @Ignore
     @Test
     public void testSixLevelsOfNestingWithNulls() {
         assertEquals(
@@ -99,6 +103,7 @@ public final class FlattenerTest {
               "negative two")));
     }
 
+    @Ignore
     @Test
     public void testNestedListsFullOfNullsOnly() {
         assertEquals(