ch14.5

internal/assert/assert.go

@@ -1,6 +1,9 @@
 package assert
 
-import "testing"
+import (
+	"strings"
+	"testing"
+)
 
 func Equal[T comparable](t *testing.T, actual, expected T) {
 	t.Helper()
@@ -9,3 +12,11 @@ func Equal[T comparable](t *testing.T, actual, expected T) {
 		t.Errorf("got: %v; want: %v", actual, expected)
 	}
 }
+
+func StringContains(t *testing.T, actual, expectedString string) {
+	t.Helper()
+
+	if !strings.Contains(actual, expectedString) {
+		t.Errorf("got: %q; expected to contain: %q", actual, expectedString)
+	}
+}