diff --git a/2020/day05/main_test.go b/2020/day05/main_test.go
new file mode 100644
index 0000000..dc331bd
--- /dev/null
+++ b/2020/day05/main_test.go
@@ -0,0 +1,18 @@
+package main
+
+import "testing"
+
+var testInput = []string{
+	"FBFBBFFRLR",
+	"BFFFBBFRRR",
+	"FFFBBBFRRR",
+	"BBFFBBFRLL",
+}
+
+func TestPartOne(t *testing.T) {
+	expected := 820
+	got := PartOne(testInput)
+	if got != expected {
+		t.Errorf("PartOne() = %d, want %d", got, expected)
+	}
+}