test: add unit tests for both parts

internal/2015/DayFive/code_test.go

@@ -0,0 +1,32 @@
+package dayfive
+
+import "testing"
+
+func TestPartOne(t *testing.T) {
+	input := []string{
+		"ugknbfddgicrmopn",
+		"aaa",
+		"jchzalrnumimnmhp",
+		"haegwjzuvuyypxyu",
+		"dvszwmarrgswjxmb",
+	}
+	expected := 2
+	got := PartOne(input)
+	if got != expected {
+		t.Errorf("PartOne() = %d, want %d", got, expected)
+	}
+}
+
+func TestPartTwo(t *testing.T) {
+	input := []string{
+		"qjhvhtzxzqqjkmpb",
+		"xxyxx",
+		"uurcxstgmygtbstg",
+		"ieodomkazucvgmuy",
+	}
+	expected := 2
+	got := PartTwo(input)
+	if got != expected {
+		t.Errorf("PartTwo() = %d, want %d", got, expected)
+	}
+}