flatten_array

elixir/flatten-array/test/flatten_array_test.exs

@@ -0,0 +1,58 @@
+defmodule FlattenArrayTest do
+  use ExUnit.Case
+
+  test "empty" do
+    assert FlattenArray.flatten([]) ==
+             []
+  end
+
+  test "no nesting" do
+    assert FlattenArray.flatten([0, 1, 2]) ==
+             [0, 1, 2]
+  end
+
+  test "flattens a nested array" do
+    assert FlattenArray.flatten([[[]]]) ==
+             []
+  end
+
+  test "flattens array with just integers present" do
+    assert FlattenArray.flatten([1, [2, 3, 4, 5, 6, 7], 8]) ==
+             [1, 2, 3, 4, 5, 6, 7, 8]
+  end
+
+  test "5 level nesting" do
+    assert FlattenArray.flatten([0, 2, [[2, 3], 8, 100, 4, [[[50]]]], -2]) ==
+             [0, 2, 2, 3, 8, 100, 4, 50, -2]
+  end
+
+  test "6 level nesting" do
+    assert FlattenArray.flatten([1, [2, [[3]], [4, [[5]]], 6, 7], 8]) ==
+             [1, 2, 3, 4, 5, 6, 7, 8]
+  end
+
+  test "nil values values are omitted from the final result" do
+    assert FlattenArray.flatten([1, 2, nil]) ==
+             [1, 2]
+  end
+
+  test "consecutive nil values at the front of the list are omitted from the final result" do
+    assert FlattenArray.flatten([nil, nil, 3]) ==
+             [3]
+  end
+
+  test "consecutive nil values in the middle of the list are omitted from the final result" do
+    assert FlattenArray.flatten([1, nil, nil, 4]) ==
+             [1, 4]
+  end
+
+  test "6 level nesting with nil values" do
+    assert FlattenArray.flatten([0, 2, [[2, 3], 8, [[100]], nil, [[nil]]], -2]) ==
+             [0, 2, 2, 3, 8, 100, -2]
+  end
+
+  test "all values in nested list are null" do
+    assert FlattenArray.flatten([nil, [[[nil]]], nil, nil, [[nil, nil], nil], nil]) ==
+             []
+  end
+end

elixir/flatten-array/test/test_helper.exs

@@ -0,0 +1,2 @@
+ExUnit.start()
+ExUnit.configure(exclude: :pending, trace: true)