chore: add tests for day 4

day04/example.txt

@@ -3,3 +3,4 @@ Card 2: 13 32 20 16 61 | 61 30 68 82 17 32 24 19
 Card 3:  1 21 53 59 44 | 69 82 63 72 16 21 14  1 
 Card 4: 41 92 73 84 69 | 59 84 76 51 58  5 54 83 
 Card 5: 87 83 26 28 32 | 88 30 70 12 93 22 82 36 
+Card 6: 31 18 13 56 72 | 74 77 10 23 35 67 36 11

day04/main_test.go

@@ -0,0 +1,32 @@
+package main
+
+import (
+	"bufio"
+	"bytes"
+	"testing"
+
+	_ "embed"
+
+	"github.com/matryer/is"
+)
+
+//go:embed example.txt
+var example []byte
+
+func TestExample(t *testing.T) {
+	is := is.New(t)
+	scan := bufio.NewScanner(bytes.NewReader(example))
+
+	points, cards := run(scan)
+	is.Equal(points, 13)
+	is.Equal(cards, 30)
+}
+
+func TestSolution(t *testing.T) {
+	is := is.New(t)
+	scan := bufio.NewScanner(bytes.NewReader(input))
+
+	points, cards := run(scan)
+	is.Equal(points, 23235)
+	is.Equal(cards, 5920640)
+}

go.mod

@@ -1,3 +1,5 @@
 module go.sour.is/advent-of-code-2023
 
 go 1.21.3
+
+require github.com/matryer/is v1.4.1

go.sum

@@ -0,0 +1,2 @@
+github.com/matryer/is v1.4.1 h1:55ehd8zaGABKLXQUe2awZ99BD/PTc2ls+KV/dXphgEQ=
+github.com/matryer/is v1.4.1/go.mod h1:8I/i5uYgLzgsgEloJE1U6xx5HkBQpAZvepWuujKwMRU=