   use ExUnit.Case
 
   # @tag :pending
-  test "no coins make 0 change" do
-    coins = [1, 5, 10, 21, 25]
-    expected = []
-    assert Change.generate(coins, 0) == {:ok, expected}
-  end
-
-  @tag :pending
-  test "cannot find negative change values" do
-    coins = [1, 2, 5]
-    assert Change.generate(coins, -5) == {:error, "cannot change"}
-  end
-
-  @tag :pending
-  test "error testing for change smaller than the smallest of coins" do
-    coins = [5, 10]
-    assert Change.generate(coins, 3) == {:error, "cannot change"}
-  end
-
-  @tag :pending
   test "single coin change" do
     coins = [1, 5, 10, 25, 100]
     expected = [25]

  end

  @tag :pending
  test "error if no combination can add up to target" do
    coins = [5, 10]
    assert Change.generate(coins, 94) == {:error, "cannot change"}
  end
end

    coins = [1, 5, 10, 25, 100]
    expected = [5, 10]
    assert Change.generate(coins, 15) == {:ok, expected}
  end

  @tag :pending
