diff --git a/io/writer/strings_test.go b/io/writer/strings_test.go
index 554f761..e8611b9 100644
--- a/io/writer/strings_test.go
+++ b/io/writer/strings_test.go
@@ -86,291 +86,3 @@ func TestStringsWriter(t *testing.T) {
 		}
 	}
 }
-
-func trivial() *maze.SolvedMaze {
-	/* trivial.txt
-	   ## ##
-	   #   #
-	   ### #
-
-	   Nodes are
-	   ##0##
-	   #123#
-	   ###4#
-	*/
-	ret := &maze.SolvedMaze{}
-	nodes := make([]*maze.Node, 5)
-
-	nodes[0] = maze.NewNode(maze.Coordinates{X: 2, Y: 0})
-
-	nodes[1] = maze.NewNode(maze.Coordinates{X: 1, Y: 1})
-	nodes[2] = maze.NewNode(maze.Coordinates{X: 2, Y: 1})
-	nodes[3] = maze.NewNode(maze.Coordinates{X: 3, Y: 1})
-
-	nodes[4] = maze.NewNode(maze.Coordinates{X: 3, Y: 2})
-
-	nodes[0].Down = nodes[2]
-
-	nodes[1].Right = nodes[2]
-
-	nodes[2].Up = nodes[0]
-	nodes[2].Left = nodes[1]
-	nodes[2].Right = nodes[3]
-
-	nodes[3].Left = nodes[2]
-	nodes[3].Down = nodes[4]
-
-	nodes[4].Up = nodes[3]
-
-	solution := []*maze.Node{
-		nodes[0], nodes[2], nodes[3], nodes[4],
-	}
-
-	ret.Nodes = nodes
-	ret.Width = 5
-	ret.Height = 3
-
-	ret.Solution = solution
-
-	return ret
-}
-
-func bigger() *maze.SolvedMaze {
-	/* trivial-bigger.txt
-	   ### ###
-	   ### ###
-	   #     #
-	   ##### #
-	   ##### #
-
-	   Nodes are
-	   ###0###
-	   ### ###
-	   #1 2 3#
-	   ##### #
-	   #####4#
-	*/
-	nodes := make([]*maze.Node, 5)
-
-	nodes[0] = maze.NewNode(maze.Coordinates{X: 3, Y: 0})
-
-	nodes[1] = maze.NewNode(maze.Coordinates{X: 1, Y: 2})
-	nodes[2] = maze.NewNode(maze.Coordinates{X: 3, Y: 2})
-	nodes[3] = maze.NewNode(maze.Coordinates{X: 5, Y: 2})
-
-	nodes[4] = maze.NewNode(maze.Coordinates{X: 5, Y: 4})
-
-	nodes[0].Down = nodes[2]
-
-	nodes[1].Right = nodes[2]
-
-	nodes[2].Up = nodes[0]
-	nodes[2].Left = nodes[1]
-	nodes[2].Right = nodes[3]
-
-	nodes[3].Left = nodes[2]
-	nodes[3].Down = nodes[4]
-
-	nodes[4].Up = nodes[3]
-
-	ret := &maze.SolvedMaze{
-		Maze: maze.Maze{
-			Width:  7,
-			Height: 5,
-			Nodes:  nodes,
-		},
-		Solution: []*maze.Node{
-			nodes[0], nodes[2], nodes[3], nodes[4],
-		},
-	}
-
-	return ret
-}
-
-func bigger_staggered() *maze.SolvedMaze {
-	/* trivial-bigger-staggered.txt
-	   ### ###
-	   ### ###
-	   #     #
-	   #### ##
-	   #### ##
-
-	   Nodes are
-	   ###0###
-	   ### ###
-	   #1 243#
-	   #### ##
-	   ####5##
-	*/
-	nodes := make([]*maze.Node, 6)
-
-	nodes[0] = maze.NewNode(maze.Coordinates{X: 3, Y: 0})
-
-	nodes[1] = maze.NewNode(maze.Coordinates{X: 1, Y: 2})
-	nodes[2] = maze.NewNode(maze.Coordinates{X: 3, Y: 2})
-	nodes[3] = maze.NewNode(maze.Coordinates{X: 5, Y: 2})
-
-	nodes[4] = maze.NewNode(maze.Coordinates{X: 4, Y: 2})
-
-	nodes[5] = maze.NewNode(maze.Coordinates{X: 4, Y: 4})
-
-	nodes[0].Down = nodes[2]
-
-	nodes[1].Right = nodes[2]
-
-	nodes[2].Up = nodes[0]
-	nodes[2].Left = nodes[1]
-	nodes[2].Right = nodes[4]
-
-	nodes[3].Left = nodes[4]
-
-	nodes[4].Left = nodes[2]
-	nodes[4].Right = nodes[3]
-	nodes[4].Down = nodes[5]
-
-	nodes[5].Up = nodes[4]
-
-	ret := &maze.SolvedMaze{
-		Maze: maze.Maze{
-			Width:  7,
-			Height: 5,
-			Nodes:  nodes,
-		},
-		Solution: []*maze.Node{
-			nodes[0], nodes[2], nodes[4], nodes[5],
-		},
-	}
-
-	return ret
-}
-
-func normal() *maze.SolvedMaze {
-	/* normal.txt
-		##### #####
-		#     #   #
-		##### ### #
-		#   #     #
-		# # ##### #
-		# #       #
-		### ### # #
-		#   #   # #
-		# ####### #
-		#     #   #
-		##### #####
-
-	    Nodes are
-		#####0#####
-		#1   2#3 4#
-		##### ### #
-		#5 6#7   8#
-		# # ##### #
-		#9#A   F B#
-		### ### # #
-		#C D#E G# #
-		# ####### #
-		#H   I#J K#
-		#####L#####
-	*/
-	nodes := make([]*maze.Node, 22)
-
-	// ---- Node creation ----
-	coords := []struct{ x, y int }{
-		{5, 0}, // 0
-
-		{1, 1}, // 1
-		{5, 1}, // 2
-		{7, 1}, // 3
-		{9, 1}, // 4
-
-		{1, 3}, // 5
-		{3, 3}, // 6
-		{5, 3}, // 7
-		{9, 3}, // 8
-
-		{1, 5}, // 9
-		{3, 5}, // A (10)
-		{9, 5}, // B (11)
-
-		{1, 7}, // C (12)
-		{3, 7}, // D (13)
-		{5, 7}, // E (14)
-		{7, 5}, // F (15)
-		{7, 7}, // G (16)
-
-		{1, 9}, // H (17)
-		{5, 9}, // I (18)
-		{7, 9}, // J (19)
-		{9, 9}, // K (20)
-
-		{5, 10}, // L (21)
-	}
-
-	for i, coord := range coords {
-		nodes[i] = maze.NewNode(maze.Coordinates{X: coord.x, Y: coord.y})
-	}
-
-	// ---- Node linking ----
-	// Vertical
-	links := []struct {
-		from, to int
-	}{
-		{0, 2},
-		{2, 7},
-		{4, 8},
-		{5, 9},
-		{6, 10},
-		{8, 11},
-		{10, 13},
-		{15, 16},
-		{11, 20},
-		{12, 17},
-		{18, 21},
-	}
-	for _, link := range links {
-		nodes[link.from].Down = nodes[link.to]
-		nodes[link.to].Up = nodes[link.from]
-	}
-
-	links = []struct {
-		from, to int
-	}{
-		{1, 2},
-		{3, 4},
-		{5, 6},
-		{7, 8},
-		{10, 15},
-		{15, 11},
-		{12, 13},
-		{14, 16},
-		{17, 18},
-		{19, 20},
-	}
-	for _, link := range links {
-		nodes[link.from].Right = nodes[link.to]
-		nodes[link.to].Left = nodes[link.from]
-	}
-
-	ret := &maze.SolvedMaze{
-		Maze: maze.Maze{
-			Width:  11,
-			Height: 11,
-			Nodes:  nodes,
-		},
-		Solution: []*maze.Node{
-			nodes[0],
-			nodes[2],
-			nodes[7],
-			nodes[8],
-			nodes[11],
-			nodes[15],
-			nodes[10],
-			nodes[13],
-			nodes[12],
-			nodes[17],
-			nodes[18],
-			nodes[21],
-		},
-	}
-
-	return ret
-}
diff --git a/io/writer/utils.go b/io/writer/utils.go
new file mode 100644
index 0000000..1dfc15d
--- /dev/null
+++ b/io/writer/utils.go
@@ -0,0 +1,291 @@
+package writer
+
+import "maze-solver/maze"
+
+func trivial() *maze.SolvedMaze {
+	/* trivial.txt
+	   ## ##
+	   #   #
+	   ### #
+
+	   Nodes are
+	   ##0##
+	   #123#
+	   ###4#
+	*/
+	ret := &maze.SolvedMaze{}
+	nodes := make([]*maze.Node, 5)
+
+	nodes[0] = maze.NewNode(maze.Coordinates{X: 2, Y: 0})
+
+	nodes[1] = maze.NewNode(maze.Coordinates{X: 1, Y: 1})
+	nodes[2] = maze.NewNode(maze.Coordinates{X: 2, Y: 1})
+	nodes[3] = maze.NewNode(maze.Coordinates{X: 3, Y: 1})
+
+	nodes[4] = maze.NewNode(maze.Coordinates{X: 3, Y: 2})
+
+	nodes[0].Down = nodes[2]
+
+	nodes[1].Right = nodes[2]
+
+	nodes[2].Up = nodes[0]
+	nodes[2].Left = nodes[1]
+	nodes[2].Right = nodes[3]
+
+	nodes[3].Left = nodes[2]
+	nodes[3].Down = nodes[4]
+
+	nodes[4].Up = nodes[3]
+
+	solution := []*maze.Node{
+		nodes[0], nodes[2], nodes[3], nodes[4],
+	}
+
+	ret.Nodes = nodes
+	ret.Width = 5
+	ret.Height = 3
+
+	ret.Solution = solution
+
+	return ret
+}
+
+func bigger() *maze.SolvedMaze {
+	/* trivial-bigger.txt
+	   ### ###
+	   ### ###
+	   #     #
+	   ##### #
+	   ##### #
+
+	   Nodes are
+	   ###0###
+	   ### ###
+	   #1 2 3#
+	   ##### #
+	   #####4#
+	*/
+	nodes := make([]*maze.Node, 5)
+
+	nodes[0] = maze.NewNode(maze.Coordinates{X: 3, Y: 0})
+
+	nodes[1] = maze.NewNode(maze.Coordinates{X: 1, Y: 2})
+	nodes[2] = maze.NewNode(maze.Coordinates{X: 3, Y: 2})
+	nodes[3] = maze.NewNode(maze.Coordinates{X: 5, Y: 2})
+
+	nodes[4] = maze.NewNode(maze.Coordinates{X: 5, Y: 4})
+
+	nodes[0].Down = nodes[2]
+
+	nodes[1].Right = nodes[2]
+
+	nodes[2].Up = nodes[0]
+	nodes[2].Left = nodes[1]
+	nodes[2].Right = nodes[3]
+
+	nodes[3].Left = nodes[2]
+	nodes[3].Down = nodes[4]
+
+	nodes[4].Up = nodes[3]
+
+	ret := &maze.SolvedMaze{
+		Maze: maze.Maze{
+			Width:  7,
+			Height: 5,
+			Nodes:  nodes,
+		},
+		Solution: []*maze.Node{
+			nodes[0], nodes[2], nodes[3], nodes[4],
+		},
+	}
+
+	return ret
+}
+
+func bigger_staggered() *maze.SolvedMaze {
+	/* trivial-bigger-staggered.txt
+	   ### ###
+	   ### ###
+	   #     #
+	   #### ##
+	   #### ##
+
+	   Nodes are
+	   ###0###
+	   ### ###
+	   #1 243#
+	   #### ##
+	   ####5##
+	*/
+	nodes := make([]*maze.Node, 6)
+
+	nodes[0] = maze.NewNode(maze.Coordinates{X: 3, Y: 0})
+
+	nodes[1] = maze.NewNode(maze.Coordinates{X: 1, Y: 2})
+	nodes[2] = maze.NewNode(maze.Coordinates{X: 3, Y: 2})
+	nodes[3] = maze.NewNode(maze.Coordinates{X: 5, Y: 2})
+
+	nodes[4] = maze.NewNode(maze.Coordinates{X: 4, Y: 2})
+
+	nodes[5] = maze.NewNode(maze.Coordinates{X: 4, Y: 4})
+
+	nodes[0].Down = nodes[2]
+
+	nodes[1].Right = nodes[2]
+
+	nodes[2].Up = nodes[0]
+	nodes[2].Left = nodes[1]
+	nodes[2].Right = nodes[4]
+
+	nodes[3].Left = nodes[4]
+
+	nodes[4].Left = nodes[2]
+	nodes[4].Right = nodes[3]
+	nodes[4].Down = nodes[5]
+
+	nodes[5].Up = nodes[4]
+
+	ret := &maze.SolvedMaze{
+		Maze: maze.Maze{
+			Width:  7,
+			Height: 5,
+			Nodes:  nodes,
+		},
+		Solution: []*maze.Node{
+			nodes[0], nodes[2], nodes[4], nodes[5],
+		},
+	}
+
+	return ret
+}
+
+func normal() *maze.SolvedMaze {
+	/* normal.txt
+		##### #####
+		#     #   #
+		##### ### #
+		#   #     #
+		# # ##### #
+		# #       #
+		### ### # #
+		#   #   # #
+		# ####### #
+		#     #   #
+		##### #####
+
+	    Nodes are
+		#####0#####
+		#1   2#3 4#
+		##### ### #
+		#5 6#7   8#
+		# # ##### #
+		#9#A   F B#
+		### ### # #
+		#C D#E G# #
+		# ####### #
+		#H   I#J K#
+		#####L#####
+	*/
+	nodes := make([]*maze.Node, 22)
+
+	// ---- Node creation ----
+	coords := []struct{ x, y int }{
+		{5, 0}, // 0
+
+		{1, 1}, // 1
+		{5, 1}, // 2
+		{7, 1}, // 3
+		{9, 1}, // 4
+
+		{1, 3}, // 5
+		{3, 3}, // 6
+		{5, 3}, // 7
+		{9, 3}, // 8
+
+		{1, 5}, // 9
+		{3, 5}, // A (10)
+		{9, 5}, // B (11)
+
+		{1, 7}, // C (12)
+		{3, 7}, // D (13)
+		{5, 7}, // E (14)
+		{7, 5}, // F (15)
+		{7, 7}, // G (16)
+
+		{1, 9}, // H (17)
+		{5, 9}, // I (18)
+		{7, 9}, // J (19)
+		{9, 9}, // K (20)
+
+		{5, 10}, // L (21)
+	}
+
+	for i, coord := range coords {
+		nodes[i] = maze.NewNode(maze.Coordinates{X: coord.x, Y: coord.y})
+	}
+
+	// ---- Node linking ----
+	// Vertical
+	links := []struct {
+		from, to int
+	}{
+		{0, 2},
+		{2, 7},
+		{4, 8},
+		{5, 9},
+		{6, 10},
+		{8, 11},
+		{10, 13},
+		{15, 16},
+		{11, 20},
+		{12, 17},
+		{18, 21},
+	}
+	for _, link := range links {
+		nodes[link.from].Down = nodes[link.to]
+		nodes[link.to].Up = nodes[link.from]
+	}
+
+	links = []struct {
+		from, to int
+	}{
+		{1, 2},
+		{3, 4},
+		{5, 6},
+		{7, 8},
+		{10, 15},
+		{15, 11},
+		{12, 13},
+		{14, 16},
+		{17, 18},
+		{19, 20},
+	}
+	for _, link := range links {
+		nodes[link.from].Right = nodes[link.to]
+		nodes[link.to].Left = nodes[link.from]
+	}
+
+	ret := &maze.SolvedMaze{
+		Maze: maze.Maze{
+			Width:  11,
+			Height: 11,
+			Nodes:  nodes,
+		},
+		Solution: []*maze.Node{
+			nodes[0],
+			nodes[2],
+			nodes[7],
+			nodes[8],
+			nodes[11],
+			nodes[15],
+			nodes[10],
+			nodes[13],
+			nodes[12],
+			nodes[17],
+			nodes[18],
+			nodes[21],
+		},
+	}
+
+	return ret
+}