more test coverage

.gitignore

@@ -3,3 +3,4 @@
 /.idea
 cmd/cgol/cgol
 tmp.gif
+*.gif

gif/gif.go

@@ -63,18 +63,15 @@ func buildImage(arr [][]int) *image.Paletted {
 func writeGif(name string, g *gif.GIF) {
 	w, err := os.Create(name + ".gif")
 	if err != nil {
-		fmt.Println("os.Create")
-		panic(err)
+		fmt.Printf("os.Create Error: %v\n", err)
 	}
 	defer func() {
 		if err := w.Close(); err != nil {
-			fmt.Println("w.Close")
-			panic(err)
+			fmt.Printf("w.Close Error: %v\n", err)
 		}
 	}()
 	err = gif.EncodeAll(w, g)
 	if err != nil {
-		fmt.Println("gif.EncodeAll")
-		panic(err)
+		fmt.Printf("gif.EncodeAll Error: %v\n", err)
 	}
 }

gif/gif_test.go

@@ -13,3 +13,13 @@ func Test_GIF(t *testing.T) {
 	gv.AddFrame([][]int{{0, 1, 0}, {0, 0, 1}, {1, 1, 1}})
 	gv.Complete()
 }
+
+func Test_Complete(t *testing.T) {
+	var gv = &GifVisualizer{}
+	gv.Setup("//")
+
+	gv.AddFrame([][]int{{0, 1, 0}, {0, 0, 1}, {1, 1, 1}})
+	gv.AddFrame([][]int{{1, 0, 1}, {1, 1, 0}, {0, 0, 0}})
+	gv.AddFrame([][]int{{0, 1, 0}, {0, 0, 1}, {1, 1, 1}})
+	gv.Complete()
+}

life/life.go

@@ -25,7 +25,8 @@ func (field *Field) getVitality(x, y int) int {
 	return field.cells[y][x]
 }
 
-func (field *Field) nextVitality(x, y int) int {
+// LivingNeighbors returns the number of living neighbors of a cell
+func (field *Field) LivingNeighbors(x, y int) int {
 	alive := 0
 	for i := -1; i <= 1; i++ {
 		for j := -1; j <= 1; j++ {
@@ -34,12 +35,15 @@ func (field *Field) nextVitality(x, y int) int {
 			}
 		}
 	}
-	vitality := field.getVitality(x, y)
-	if alive == 3 || alive == 2 && (vitality > 0) {
-		if vitality < 8 {
-			return vitality + 1
-		}
-		return vitality
+	return alive
+}
+
+// NextVitality returns the vitality of a cell in the next round
+func (field *Field) NextVitality(x, y int) int {
+	livingNeighbors := field.LivingNeighbors(x, y)
+	isLiving := field.getVitality(x, y) > 0
+	if livingNeighbors == 3 || (livingNeighbors == 2 && isLiving) {
+		return 1
 	}
 	return 0
 }
@@ -49,7 +53,7 @@ func (field *Field) NextRound() *Field {
 	newFieldVar := newField(field.width, field.height)
 	for y := 0; y < field.height; y++ {
 		for x := 0; x < field.width; x++ {
-			newFieldVar.setVitality(x, y, field.nextVitality(x, y))
+			newFieldVar.setVitality(x, y, field.NextVitality(x, y))
 		}
 	}
 	return newFieldVar

life/life_test.go

@@ -39,9 +39,11 @@ func Test_LoadErrors(t *testing.T) {
 	folder := getFolder()
 
 	field := LoadFirstRound(64, 64, "foo")
+	field = LoadFirstRound(64, 64, "/")
 	field = LoadFirstRound(64, 64, folder)
 	field = LoadFirstRound(64, 64, folder+"24.txt")
 	field = LoadFirstRound(64, 64, folder+"25.rle")
+	field = LoadFirstRound(64, 64, folder+"10.rle")
 
 	for i := 0; i != 64; i++ {
 		field = field.NextRound()