require 'graph'
require 'torch'
local tester = torch.Tester()
local tests = torch.TestSuite()

function tests.layout()
   local g = graph.Graph()
   local root = graph.Node(10)
   local n1 = graph.Node(1)
   local n2 = graph.Node(2)
   g:add(graph.Edge(root, n1))
   g:add(graph.Edge(n1, n2))

   local positions = graph.graphvizLayout(g, 'dot')
   local xs = positions:select(2, 1)
   local ys = positions:select(2, 2)
   tester:assertlt(xs:add(-xs:mean()):norm(), 1e-3,
   "x coordinates should be the same")
   tester:assertTensorEq(ys, torch.sort(ys, true), 1e-3,
   "y coordinates should be ordered")
end


function tests.testDotEscape()
   tester:assert(graph._dotEscape('red') == 'red', 'Don\'t escape single words')
   tester:assert(graph._dotEscape('My label') == '"My label"',
   'Use quotes for spaces')
   tester:assert(graph._dotEscape('Non[an') == '"Non[an"',
   'Use quotes for non-alpha characters')
   tester:assert(graph._dotEscape('My\nnewline') == '"My\\nnewline"',
   'Escape newlines')
   tester:assert(graph._dotEscape('Say "hello"') == '"Say \\"hello\\""',
   'Escape quotes')
end


return tester:add(tests):run()