tests: add 2022D1 unit tests

internal/2022/DayOne/code_test.go

@@ -0,0 +1,36 @@
+package dayone
+
+import "testing"
+
+var testInput = []string{
+	"1000",
+	"2000",
+	"3000",
+	"",
+	"4000",
+	"",
+	"5000",
+	"6000",
+	"",
+	"7000",
+	"8000",
+	"9000",
+	"",
+	"10000",
+}
+
+func TestPartOne(t *testing.T) {
+	expected := 24000
+	got := PartOne(testInput)
+	if got != expected {
+		t.Errorf("PartOne() = %d, want %d", got, expected)
+	}
+}
+
+func TestPartTwo(t *testing.T) {
+	expected := 45000
+	got := PartTwo(testInput)
+	if got != expected {
+		t.Errorf("PartTwo() = %d, want %d", got, expected)
+	}
+}