Add tetris move api and fix collisions

lib/bottom.ex

@@ -9,7 +9,7 @@ defmodule Tetris.Bottom do
     collides?(bottom, {x,y})
   end
   def collides?(bottom, {x,y}) do
-    !!Map.get(bottom, {x,y})
+    !!Map.get(bottom, {x,y}) || x < 1 || x > 10 || y > 20
   end
   def collides?(bottom, points) when is_list(points) do
     Enum.any?(points, &collides?(bottom,&1))

lib/tetris.ex

@@ -1,6 +1,25 @@
 defmodule Tetris do
+  alias Tetris.{Bottom, Brick, Points}
 
-  def hello do
+  def prepare(brick) do
-    :world
+    brick
+    |> Brick.prepare
+    |> Points.move_to_location(brick.location)
+
+  end
+
+  def try_move(brick, bottom, f) do
+    new_brick = f.(brick)
+
+    if Bottom.collides?(bottom, prepare(new_brick)) do
+        brick
+    else
+        new_brick
+    end
   end
+
+  def try_left(brick, bottom), do: try_move(brick,bottom, &Brick.left/1)
+  def try_right(brick, bottom), do: try_move(brick,bottom, &Brick.right/1)
+  def try_spin(brick, bottom), do: try_move(brick,bottom, &Brick.spin_90/1)
+
 end

test/tetris_test.exs

@@ -1,7 +1,26 @@
 defmodule TetrisTest do
   use ExUnit.Case
+  import Tetris
+  alias Tetris.{Brick}
 
-  test "greets the world" do
+  test "try to move right, success" do
-    assert Tetris.hello() == :world
+    brick = Brick.new(%{location: {5,1}})
+    bottom = %{}
+
+    expected = brick |> Brick.right
+    actual = try_right(brick, bottom)
+
+    assert actual == expected
+  end
+
+  test "try to move right, failure returns original brick " do
+    brick = Brick.new(%{location: {8,1}})
+    bottom = %{}
+
+    actual = try_right(brick, bottom)
+
+    assert actual == brick
   end
+
+
 end