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diff --git a/test/07-test-surface.js b/test/07-test-surface.js
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+var assert = require("assert")
+var vec2 = require("../public/assets/javascripts/rectangles/models/vec2.js")
+var Rect = require("../public/assets/javascripts/rectangles/models/rect.js")
+var Surface = require("../public/assets/javascripts/rectangles/models/surface.js")
+
+// [[1 3] [0 4]] front back left right
+// [[3 4] [2 4]] front back left right
+// [[4 5] [0 4]] front back left right
+
+var small = new vec2(2, 2)
+var wide = new vec2(5, 1)
+var tall = new vec2(1, 5)
+var large = new vec2(7, 7)
+var position = new vec2(2, 1)
+
+describe('basic surface', function(){
+  var surface = new Surface ()
+  surface.add( new Rect( new vec2(1, 6), new vec2(0, 4) ) )
+
+  var position = new vec2(2, 1)
+
+  describe('#clamp_delta()', function(){
+    it("does not alter a zero delta", function(){
+      var delta = new vec2(0,0)
+      surface.clamp_delta(surface.bounds, small, position, delta)
+      assert.equal(true, delta.eq(new vec2( 0, 0 )))
+    })
+    it("does not alter a minimal delta", function(){
+      var delta = new vec2(1,1)
+      surface.clamp_delta(surface.bounds, small, position, delta)
+      assert.equal(true, delta.eq(new vec2( 1, 1 )))
+    })
+    it("clamps leftward delta", function(){
+      var delta = new vec2(-10, 0)
+      surface.clamp_delta(surface.bounds, small, position, delta)
+      assert.equal(true, delta.eq(new vec2( -1, 0 )))
+    })
+    it("clamps rightward delta", function(){
+      var delta = new vec2(10, 0)
+      surface.clamp_delta(surface.bounds, small, position, delta)
+      assert.equal(true, delta.eq(new vec2( 2, 0 )))
+    })
+    it("clamps upward delta", function(){
+      var delta = new vec2(0, 10)
+      surface.clamp_delta(surface.bounds, small, position, delta)
+      assert.equal(true, delta.eq(new vec2( 0, 1 )))
+    })
+    it("clamps downward delta", function(){
+      var delta = new vec2(0, -10)
+      surface.clamp_delta(surface.bounds, small, position, delta)
+      assert.equal(true, delta.eq(new vec2( 0, -1 )))
+    })
+  })
+
+  describe('#bounds_at_index_with_dimensions()', function(){
+    it("generates proper bounds from left", function(){
+      var bounds = surface.bounds_at_index_with_dimensions(0, small)
+      assert.notEqual(false, bounds)
+      assert.equal(true, bounds.eq(new Rect(1,0, 6,4)))
+    })
+    it("generates proper bounds with wide", function(){
+      var bounds = surface.bounds_at_index_with_dimensions(0, wide)
+      assert.notEqual(false, bounds)
+      assert.equal(true, bounds.eq(new Rect(1,0, 6,4)))
+    })
+    it("returns false for large image", function(){
+      var bounds = surface.bounds_at_index_with_dimensions(0, large)
+      assert.equal(false, bounds)
+    })
+  })
+})
+
+describe('half surface', function(){
+  var surface = new Surface ()
+  surface.add( new Rect( new vec2(1, 6), new vec2(2, 6) ) )
+
+  var position = new vec2(2, 3)
+
+  describe('#clamp_delta()', function(){
+    it("does not alter a zero delta", function(){
+      var delta = new vec2(0,0)
+      surface.clamp_delta(surface.bounds, small, position, delta)
+      assert.equal(true, delta.eq(new vec2( 0, 0 )))
+    })
+    it("does not alter a minimal delta", function(){
+      var delta = new vec2(1,1)
+      surface.clamp_delta(surface.bounds, small, position, delta)
+      assert.equal(true, delta.eq(new vec2( 1, 1 )))
+    })
+    it("clamps leftward delta", function(){
+      var delta = new vec2(-10, 0)
+      surface.clamp_delta(surface.bounds, small, position, delta)
+      assert.equal(true, delta.eq(new vec2( -1, 0 )))
+    })
+    it("clamps rightward delta", function(){
+      var delta = new vec2(10, 0)
+      surface.clamp_delta(surface.bounds, small, position, delta)
+      assert.equal(true, delta.eq(new vec2( 2, 0 )))
+    })
+    it("clamps upward delta", function(){
+      var delta = new vec2(0, 10)
+      surface.clamp_delta(surface.bounds, small, position, delta)
+      assert.equal(true, delta.eq(new vec2( 0, 1 )))
+    })
+    it("clamps downward delta", function(){
+      var delta = new vec2(0, -10)
+      surface.clamp_delta(surface.bounds, small, position, delta)
+      assert.equal(true, delta.eq(new vec2( 0, -1 )))
+    })
+  })
+})
+
+describe('double surface', function(){
+  var surface = new Surface ()
+  surface.add( new Rect( new vec2(1, 3), new vec2(0, 4) ) )
+  surface.add( new Rect( new vec2(3, 6), new vec2(0, 4) ) )
+
+  describe('#bounds_at_index_with_dimensions()', function(){
+    it("generates proper bounds from left", function(){
+      var bounds = surface.bounds_at_index_with_dimensions(0, small)
+      assert.notEqual(false, bounds)
+      assert.equal(true, bounds.eq(new Rect(1,0, 6,4)))
+    })
+    it("generates proper bounds from right", function(){
+      var bounds = surface.bounds_at_index_with_dimensions(1, small)
+      assert.notEqual(false, bounds)
+      assert.equal(true, bounds.eq(new Rect(1,0, 6,4)))
+    })
+    it("generates proper bounds with wide", function(){
+      var bounds = surface.bounds_at_index_with_dimensions(0, wide)
+      assert.notEqual(false, bounds)
+      assert.equal(true, bounds.eq(new Rect(1,0, 6,4)))
+    })
+    it("generates proper bounds with wide from right", function(){
+      var bounds = surface.bounds_at_index_with_dimensions(1, wide)
+      assert.notEqual(false, bounds)
+      assert.equal(true, bounds.eq(new Rect(1,0, 6,4)))
+    })
+    it("returns false for large image", function(){
+      var bounds = surface.bounds_at_index_with_dimensions(0, large)
+      assert.equal(false, bounds)
+    })
+  })
+})
+
+describe('triple surface', function(){
+  var surface = new Surface ()
+  surface.add( new Rect( new vec2(1, 3), new vec2(0, 4) ) )
+  surface.add( new Rect( new vec2(3, 5), new vec2(0, 4) ) )
+
+  var small = new vec2(2, 2)
+  var oblong = new vec2(4, 1)
+
+  // describe placement
+  // describe dragging up (clamp at top edge)
+  // describe dragging down (clamp at bottom edge)
+  // describe dragging left (clamp at left edge)
+  // describe dragging right (clamp at right edge)
+})
+
+describe('two-level surface', function(){
+  var surface = new Surface ()
+  surface.add( new Rect( new vec2(1, 3), new vec2(0, 4) ) )
+  surface.add( new Rect( new vec2(3, 6), new vec2(0, 6) ) )
+
+  describe('#bounds_at_index_with_dimensions()', function(){
+    it("generates proper bounds from left", function(){
+      var bounds = surface.bounds_at_index_with_dimensions(0, small)
+      assert.notEqual(false, bounds)
+      assert.equal(true, bounds.eq(new Rect(1,0, 6,4)))
+    })
+    it("generates proper bounds from right", function(){
+      var bounds = surface.bounds_at_index_with_dimensions(1, small)
+      assert.notEqual(false, bounds)
+      assert.equal(true, bounds.eq(new Rect(3,0, 6,6)))
+    })
+    it("generates proper bounds with wide", function(){
+      var bounds = surface.bounds_at_index_with_dimensions(0, wide)
+      assert.notEqual(false, bounds)
+      assert.equal(true, bounds.eq(new Rect(1,0, 6,4)))
+    })
+    it("generates proper bounds with wide from right", function(){
+      var bounds = surface.bounds_at_index_with_dimensions(1, wide)
+      assert.notEqual(false, bounds)
+      assert.equal(true, bounds.eq(new Rect(1,0, 6,4)))
+    })
+    it("generates proper bounds with tall", function(){
+      var bounds = surface.bounds_at_index_with_dimensions(0, tall)
+      assert.notEqual(false, bounds)
+      assert.equal(true, bounds.eq(new Rect(3,0, 6,6)))
+    })
+    it("generates the same bounds with tall from right", function(){
+      var bounds = surface.bounds_at_index_with_dimensions(1, tall)
+      assert.notEqual(false, bounds)
+      assert.equal(true, bounds.eq(new Rect(3,0, 6,6)))
+    })
+    it("returns false for large image", function(){
+      var bounds = surface.bounds_at_index_with_dimensions(0, large)
+      assert.equal(false, bounds)
+    })
+
+  })
+
+})
+
+describe('door surface', function(){
+  var surface = new Surface ()
+  surface.add( new Rect( new vec2(1, 4), new vec2(0, 4) ) )
+  surface.add( new Rect( new vec2(4, 5), new vec2(2, 4) ) )
+  surface.add( new Rect( new vec2(5, 8), new vec2(0, 4) ) )
+
+  describe('#bounds_at_index_with_dimensions()', function(){
+    it("generates proper bounds from left", function(){
+      var bounds = surface.bounds_at_index_with_dimensions(0, small)
+      assert.notEqual(false, bounds)
+      assert.equal(true, bounds.eq(new Rect(1,0, 4,4)))
+    })
+    it("generates proper bounds from middle", function(){
+      var bounds = surface.bounds_at_index_with_dimensions(1, small)
+      assert.notEqual(false, bounds)
+      assert.equal(true, bounds.eq(new Rect(1,2, 8,4)))
+    })
+    it("generates proper bounds from right", function(){
+      var bounds = surface.bounds_at_index_with_dimensions(2, small)
+      assert.notEqual(false, bounds)
+      assert.equal(true, bounds.eq(new Rect(5,0, 8,4)))
+    })
+
+    it("generates proper bounds for wide from left", function(){
+      var bounds = surface.bounds_at_index_with_dimensions(0, wide)
+      assert.notEqual(false, bounds)
+      assert.equal(true, bounds.eq(new Rect(1,2, 8,4)))
+    })
+    it("generates proper bounds for wide from middle", function(){
+      var bounds = surface.bounds_at_index_with_dimensions(1, wide)
+      assert.notEqual(false, bounds)
+      assert.equal(true, bounds.eq(new Rect(1,2, 8,4)))
+    })
+    it("generates proper bounds for wide from right", function(){
+      var bounds = surface.bounds_at_index_with_dimensions(2, wide)
+      assert.notEqual(false, bounds)
+      assert.equal(true, bounds.eq(new Rect(1,2, 8,4)))
+    })
+
+    it("returns false for tall", function(){
+      assert.equal(false, surface.bounds_at_index_with_dimensions(0, tall))
+      assert.equal(false, surface.bounds_at_index_with_dimensions(1, tall))
+      assert.equal(false, surface.bounds_at_index_with_dimensions(2, tall))
+    })
+    it("returns false for large image", function(){
+      assert.equal(false, surface.bounds_at_index_with_dimensions(0, large))
+      assert.equal(false, surface.bounds_at_index_with_dimensions(1, large))
+      assert.equal(false, surface.bounds_at_index_with_dimensions(2, large))
+    })
+  })
+
+  describe('#fits()', function(){
+    it("fits something small", function(){
+      assert.equal(true,  !! surface.fits(small))
+    })
+    it("doesn't fit something large", function(){
+      assert.equal(false, !! surface.fits(large))
+    })
+    it("fits something wide", function(){
+      assert.equal(true,  !! surface.fits(wide))
+    })
+  })
+
+  describe('#fits_scale()', function(){
+    it("fits something large, scaled down", function(){
+      assert.equal(true,  !! surface.fits_scale(large, 0.1))
+    })
+    it("doesn't fit something small, scaled up", function(){
+      assert.equal(false, !! surface.fits_scale(small, 10))
+    })
+    it("doesn't fit something wide, scaled up", function(){
+      assert.equal(false, !! surface.fits_scale(wide, 10))
+    })
+  })
+
+  var position = new vec2(1, 1)
+  var bounds = surface.bounds_at_index_with_dimensions(0, small)
+
+  describe('#translate()', function(){
+    it("does not alter a zero delta", function(){
+      var delta = new vec2(0,0)
+      var new_bounds = surface.translate(bounds, small, position, delta)
+      assert.equal(true, delta.eq(new vec2( 0, 0 )))
+    })
+    it("does not alter a minimal delta", function(){
+      var delta = new vec2(1, 1)
+      surface.translate(bounds, small, position, delta)
+      assert.equal(true, delta.eq(new vec2( 1, 1 )))
+    })
+    it("clamps leftward delta", function(){
+      var delta = new vec2(-10, 0)
+      surface.translate(bounds, small, position, delta)
+      assert.equal(true, delta.eq(new vec2( 0, 0 )))
+    })
+    it("clamps 2px rightward delta", function(){
+      var delta = new vec2(2, 0)
+      surface.translate(bounds, small, position, delta)
+      assert.equal(true, delta.eq(new vec2( 1, 0 )))
+    })
+    it("clamps 3px rightward delta", function(){
+      var delta = new vec2(3, 0)
+      var new_bounds = surface.translate(bounds, small, position, delta)
+      assert.equal(true, delta.eq(new vec2( 1, 0 )))
+    })
+    it("clamps 4px rightward delta", function(){
+      var delta = new vec2(4, 0)
+      var new_bounds = surface.translate(bounds, small, position, delta)
+      assert.equal(true, delta.eq(new vec2( 1, 0 )))
+    })
+    it("clamps 5px rightward delta to new bounds", function(){
+      var delta = new vec2(5, 0)
+      var new_bounds = surface.translate(bounds, small, position, delta)
+      assert.equal(true, delta.eq(new vec2( 5, 0 )))
+    })
+    it("clamps 6px rightward delta", function(){
+      var delta = new vec2(6, 0)
+      var new_bounds = surface.translate(bounds, small, position, delta)
+      assert.equal(true, delta.eq(new vec2( 5, 0 )))
+    })
+    it("clamps 20px rightward delta", function(){
+      var delta = new vec2(7, 0)
+      var new_bounds = surface.translate(bounds, small, position, delta)
+      assert.equal(true, delta.eq(new vec2( 5, 0 )))
+    })
+    it("clamps upward delta 0,10", function(){
+      var delta = new vec2(0, 10)
+      var new_bounds = surface.translate(bounds, small, position, delta)
+      assert.equal(true, delta.eq(new vec2( 0, 1 )))
+    })
+    it("clamps upward delta 1,10", function(){
+      var delta = new vec2(1, 10)
+      var new_bounds = surface.translate(bounds, small, position, delta)
+      assert.equal(true, delta.eq(new vec2( 1, 1 )))
+    })
+    it("clamps upward delta 2,10", function(){
+      var delta = new vec2(2, 10)
+      var new_bounds = surface.translate(bounds, small, position, delta)
+      assert.equal(true, delta.eq(new vec2( 2, 1 )))
+    })
+    it("clamps upward delta 3,10", function(){
+      var delta = new vec2(3, 10)
+      var bounds2 = surface.translate(bounds, small, position, delta)
+      assert.equal(true, delta.eq(new vec2( 3, 1 )))
+    })
+    it("clamps upward delta 4,10", function(){
+      var delta = new vec2(4, 10)
+      var bounds2 = surface.translate(bounds, small, position, delta)
+      assert.equal(true, delta.eq(new vec2( 4, 1 )))
+    })
+    it("clamps upward delta 5,10", function(){
+      var delta = new vec2(5, 10)
+      var bounds2 = surface.translate(bounds, small, position, delta)
+      assert.equal(true, delta.eq(new vec2( 5, 1 )))
+    })
+    it("clamps upward delta 6,10", function(){
+      var delta = new vec2(6, 10)
+      var bounds2 = surface.translate(bounds, small, position, delta)
+      assert.equal(true, delta.eq(new vec2( 5, 1 )))
+    })
+    it("clamps downward delta", function(){
+      var delta = new vec2(0, -10)
+      var new_bounds = surface.translate(bounds, small, position, delta)
+      assert.equal(true, delta.eq(new vec2( 0, -1 )))
+    })
+  })
+
+})
+
+describe('double door surface', function(){
+  var surface = new Surface ()
+  surface.add( new Rect( new vec2(1, 4),   new vec2(0, 4) ) )
+  surface.add( new Rect( new vec2(4, 5),   new vec2(2, 4) ) )
+  surface.add( new Rect( new vec2(5, 8),   new vec2(0, 6) ) )
+  surface.add( new Rect( new vec2(8, 10),  new vec2(2, 4) ) )
+  surface.add( new Rect( new vec2(10, 14), new vec2(0, 4) ) )
+
+  describe('#bounds_at_index_with_dimensions()', function(){
+    it("generates proper bounds from left", function(){
+      var bounds = surface.bounds_at_index_with_dimensions(0, small)
+      assert.notEqual(false, bounds)
+      assert.equal(true, bounds.eq(new Rect(1,0, 4,4)))
+    })
+    it("generates proper bounds from left door", function(){
+      var bounds = surface.bounds_at_index_with_dimensions(1, small)
+      assert.notEqual(false, bounds)
+      assert.equal(true, bounds.eq(new Rect(1,2, 14,4)))
+    })
+    it("generates proper bounds from middle", function(){
+      var bounds = surface.bounds_at_index_with_dimensions(2, small)
+      assert.notEqual(false, bounds)
+      assert.equal(true, bounds.eq(new Rect(5,0, 8,6)))
+    })
+    it("generates proper bounds from right door", function(){
+      var bounds = surface.bounds_at_index_with_dimensions(3, small)
+      assert.notEqual(false, bounds)
+      assert.equal(true, bounds.eq(new Rect(1,2, 14,4)))
+    })
+    it("generates proper bounds from right", function(){
+      var bounds = surface.bounds_at_index_with_dimensions(4, small)
+      assert.notEqual(false, bounds)
+      assert.equal(true, bounds.eq(new Rect(10,0, 14,4)))
+    })
+
+    it("generates proper bounds for wide from left", function(){
+      var bounds = surface.bounds_at_index_with_dimensions(0, wide)
+      assert.notEqual(false, bounds)
+      assert.equal(true, bounds.eq(new Rect(1,2, 14,4)))
+    })
+    it("generates proper bounds for wide from middle", function(){
+      var bounds = surface.bounds_at_index_with_dimensions(1, wide)
+      assert.notEqual(false, bounds)
+      assert.equal(true, bounds.eq(new Rect(1,2, 14,4)))
+    })
+    it("generates proper bounds for wide from right", function(){
+      var bounds = surface.bounds_at_index_with_dimensions(4, wide)
+      assert.notEqual(false, bounds)
+      assert.equal(true, bounds.eq(new Rect(1,2, 14,4)))
+    })
+
+    it("places tall in middle", function(){
+      var bounds = surface.bounds_at_index_with_dimensions(0, tall)
+      assert.notEqual(false, bounds)
+      assert.equal(true, bounds.eq(new Rect(5,0, 8,6)))
+
+      var bounds = surface.bounds_at_index_with_dimensions(1, tall)
+      assert.equal(true, bounds.eq(new Rect(5,0, 8,6)))
+
+      var bounds = surface.bounds_at_index_with_dimensions(2, tall)
+      assert.equal(true, bounds.eq(new Rect(5,0, 8,6)))
+
+      var bounds = surface.bounds_at_index_with_dimensions(3, tall)
+      assert.equal(true, bounds.eq(new Rect(5,0, 8,6)))
+
+      var bounds = surface.bounds_at_index_with_dimensions(4, tall)
+      assert.equal(true, bounds.eq(new Rect(5,0, 8,6)))
+    })
+    it("returns false for large image", function(){
+      assert.equal(false, surface.bounds_at_index_with_dimensions(0, large))
+      assert.equal(false, surface.bounds_at_index_with_dimensions(1, large))
+      assert.equal(false, surface.bounds_at_index_with_dimensions(2, large))
+      assert.equal(false, surface.bounds_at_index_with_dimensions(3, large))
+      assert.equal(false, surface.bounds_at_index_with_dimensions(4, large))
+    })
+  })
+
+})
+
+