2021 day 5, got x vs y mixed up with row vs col again... 1816/2249

2021/day05/main_test.go

@@ -0,0 +1,60 @@
+package main
+
+import (
+	"testing"
+)
+
+var example = `0,9 -> 5,9
+8,0 -> 0,8
+9,4 -> 3,4
+2,2 -> 2,1
+7,0 -> 7,4
+6,4 -> 2,0
+0,9 -> 2,9
+3,4 -> 1,4
+0,0 -> 8,8
+5,5 -> 8,2`
+
+func Test_part1(t *testing.T) {
+	tests := []struct {
+		name  string
+		input string
+		part  int
+		want  int
+	}{
+		{
+			name:  "example",
+			input: example,
+			part:  1,
+			want:  5,
+		},
+		{
+			name:  "actual",
+			input: input,
+			part:  1,
+			want:  4993,
+		},
+		{
+			name:  "example",
+			input: example,
+			part:  2,
+			want:  12,
+		},
+		{
+			name:  "actual",
+			input: input,
+			part:  2,
+			want:  21101,
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			if tt.part == 0 {
+				t.Error("part number cannot be zero")
+			}
+			if got := countIntersections(tt.input, tt.part); got != tt.want {
+				t.Errorf("part1() = %v, want %v", got, tt.want)
+			}
+		})
+	}
+}