Hello !
I've tried this in Java, and all work has expected when I run my solution on Eclipse and with the "Run Tests" button of this site. But When I click "Submit" tests doesn't work. I haven't modified the tests. What's happen please ?

When I pass tests on Eclipse with JUnit, this test doesn't works:

assertEquals(
""NORTH", "SOUTH", "SOUTH", "EAST", "WEST", "NORTH", "WEST"",
new String[] { "WEST" },
DirReduction.dirReduc(new String[] { "NORTH", "SOUTH", "SOUTH",
"EAST", "WEST", "NORTH", "WEST" }));

But this works:

boolean test1 = Arrays.deepEquals(
new String[] { "WEST" },
DirectionsReduction.reduce(new String[] { "NORTH", "SOUTH",
"SOUTH", "EAST", "WEST", "NORTH", "WEST" }));

assertEquals("First assertion", test1, true);

Because two arrays of string in Java are equals if they conatins same objects, not equals objects

Java JUnits tests has a error. Equals in Java do not work as expected with arrays:

System.out.println(new String[] { "WEST" }.equals(
new String[] { "WEST" }));
--> FALSE

System.out.println(Arrays.deepEquals(new String[] { "WEST" },
new String[] { "WEST" }));
--> TRUE