tests: created tests dir

The tests where cluttering the src dir
so i moved them to a separate dir.
Same goes for the binaries so i changed the
outputdirectory for them and
added these to the new gitignore file

tests/engineTest.nim

@@ -0,0 +1,48 @@
+import einheit
+
+include chess
+include engine
+
+testSuite ChessTest of TestSuite:
+
+  var
+    chess: Chess
+
+  method setup() =
+    self.chess = initChess()
+
+  method testPieceEvalStalemate() =
+    self.chess = initChess("8/8/2k5/8/8/5K2/8/8 b - - 0 1")
+    var pieceEvaluation = self.chess.evaluate()
+    self.check(pieceEvaluation == 0)
+
+  method testBestMoveProm() =
+    self.chess = initChess("8/2k1P3/8/8/8/5K2/8/8 w - - 0 1")
+    var testBestMove = self.chess.bestMove(2)
+    self.check(testBestMove.start != 0)
+    self.check(indToField(testBestMove.start) == "e7")
+    self.check(indToField(testBestMove.dest) == "e8")
+
+  method testBestMoveStopProm() =
+    self.chess = initChess("8/2k1P3/8/8/8/5K2/8/8 b - - 0 1")
+    var testBestMove = self.chess.bestMove(2)
+    self.check(testBestMove.start != 0)
+    self.check(indToField(testBestMove.start) == "c7")
+    self.check(indToField(testBestMove.dest) == "d7")
+
+  method testBestMoveTacticBlack() =
+    self.chess = initChess("8/2k3r1/8/6p1/5P2/8/4K1R1/8 b - - 0 1")
+    var testBestMove = self.chess.bestMove(2)
+    self.check(testBestMove.start != 0)
+    self.check(indToField(testBestMove.start) != "g5" or indToField(
+        testBestMove.dest) != "f4")
+
+  method testBestMoveTacticWhite() =
+    self.chess = initChess("8/2k3r1/8/5p2/6P1/8/4K1R1/8 w - - 0 1")
+    var testBestMove = self.chess.bestMove(2)
+    self.check(testBestMove.start != 0)
+    self.check(indToField(testBestMove.start) != "g4" or indToField(
+        testBestMove.dest) != "f5")
+
+when isMainModule:
+  einheit.runTests()