Mark the assert test helpers as such (#90)

Using `t.Helper()`.

Also move the assert package to be internal.

1 files changed, 29 insertions, 0 deletions

diff --git a/internal/assert/assert.go b/internal/assert/assert.go
new file mode 100644
index 0000000..901b4ad
--- /dev/null
+++ b/internal/assert/assert.go
@@ -0,0 +1,29 @@
+// Package assert provides testing helpers.
+package assert
+
+import (
+	"strings"
+	"testing"
+
+	g "github.com/maragudk/gomponents"
+)
+
+// Equal checks for equality between the given expected string and the rendered Node string.
+func Equal(t *testing.T, expected string, actual g.Node) {
+	t.Helper()
+
+	var b strings.Builder
+	_ = actual.Render(&b)
+	if expected != b.String() {
+		t.Fatalf(`expected "%v" but got "%v"`, expected, actual)
+	}
+}
+
+// Error checks for a non-nil error.
+func Error(t *testing.T, err error) {
+	t.Helper()
+
+	if err == nil {
+		t.Fatal("error is nil")
+	}
+}