test: add unit test

2020/day01/main_test.go

@@ -0,0 +1,21 @@
+package main
+
+import "testing"
+
+func TestPartOne(t *testing.T) {
+	input := []int{1721, 979, 366, 299, 675, 1456}
+	expected := 514579
+	got := PartOne(input)
+	if got != expected {
+		t.Errorf("PartOne(%v) = %d, want %d", input, got, expected)
+	}
+}
+
+func TestPartTwo(t *testing.T) {
+	input := []int{1721, 979, 366, 299, 675, 1456}
+	expected := 241861950
+	got := PartTwo(input)
+	if got != expected {
+		t.Errorf("PartTwo(%v) = %d, want %d", input, got, expected)
+	}
+}