2018 day10 - gross 2D grid with moving objects

2018/day10/main_test.go

@@ -0,0 +1,78 @@
+/*
+NOTE This is not an easily testable problem, these tests are for helper functions
+*/
+
+package main
+
+import (
+	"testing"
+)
+
+func TestHasLoneIsland(t *testing.T) {
+	tests := []struct {
+		name string
+		grid [][2]int
+		want bool
+	}{
+		{"simple_all_one_island", [][2]int{
+			{1, 1},
+			{1, 2},
+			{2, 2},
+			{2, 1},
+		}, false},
+		{"simple_has_lone_cell", [][2]int{
+			{1, 1},
+			{1, 2},
+			{2, 2},
+			{2, 1},
+			{4, 1},
+		}, true},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			if got := hasLoneIsland(tt.grid); got != tt.want {
+				t.Errorf("hasLoneIsland() = %v, want %v", got, tt.want)
+			}
+		})
+	}
+}
+
+func TestPrintGrid(t *testing.T) {
+	tests := []struct {
+		name      string
+		positions [][2]int
+		want      string
+	}{
+		{"horizontal line", [][2]int{
+			{0, 0},
+			{0, 1},
+			{0, 2},
+			{0, -1},
+		}, "0000\n"},
+		{"horizontal line with gap", [][2]int{
+			{0, 0},
+			{0, 1},
+			{0, 2},
+			{0, -1},
+			{0, -4},
+			{0, -5},
+		}, "00  0000\n"},
+		{"box", [][2]int{
+			{0, 0},
+			{0, 1},
+			{0, 2},
+			{1, 0},
+			{2, 0},
+			{2, 1},
+			{2, 2},
+			{1, 2},
+		}, "000\n0 0\n000\n"},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			if got := printGrid(tt.positions); got != tt.want {
+				t.Errorf("printGrid() = %q, want %q", got, tt.want)
+			}
+		})
+	}
+}