Add queen_threats exercise

queen_threats.lua

@@ -0,0 +1,39 @@
+-- Solution --------------------------------------------------------------------
+
+function is_queen_threat(queen_position, pawn_position)
+   -- Your implementation here
+end
+
+-- Tests -----------------------------------------------------------------------
+
+local luaunit = require("luaunit.luaunit")
+
+function test_B4_theatens_G4()
+   luaunit.assertTrue(is_queen_threat("B4", "G4"))
+end
+
+function test_D7_theatens_D1()
+   luaunit.assertTrue(is_queen_threat("D7", "D1"))
+end
+
+function test_C5_theatens_F8()
+   luaunit.assertTrue(is_queen_threat("C5", "F8"))
+end
+
+function test_B3_theatens_D1()
+   luaunit.assertTrue(is_queen_threat("B3", "D1"))
+end
+
+function test_B4_does_not_threaten_F3()
+   luaunit.assertFalse(is_queen_threat("B4", "F3"))
+end
+
+function test_E2_does_not_threaten_G1()
+   luaunit.assertFalse(is_queen_threat("E2", "G1"))
+end
+
+function test_A8_does_not_threaten_G3()
+   luaunit.assertFalse(is_queen_threat("A8", "G3"))
+end
+
+os.exit(luaunit.LuaUnit.run())