Mark the assert test helpers as such (#90)

Using `t.Helper()`.

Also move the assert package to be internal.

components/attributes_test.go

@@ -5,8 +5,8 @@ import (
 	"testing"
 
 	g "github.com/maragudk/gomponents"
-	"github.com/maragudk/gomponents/assert"
 	c "github.com/maragudk/gomponents/components"
+	"github.com/maragudk/gomponents/internal/assert"
 )
 
 func TestClasses(t *testing.T) {

components/documents_test.go

@@ -4,9 +4,9 @@ import (
 	"testing"
 
 	g "github.com/maragudk/gomponents"
-	"github.com/maragudk/gomponents/assert"
 	. "github.com/maragudk/gomponents/components"
 	. "github.com/maragudk/gomponents/html"
+	"github.com/maragudk/gomponents/internal/assert"
 )
 
 func TestHTML5(t *testing.T) {

components/elements_test.go

@@ -4,8 +4,8 @@ import (
 	"testing"
 
 	g "github.com/maragudk/gomponents"
-	"github.com/maragudk/gomponents/assert"
 	c "github.com/maragudk/gomponents/components"
+	"github.com/maragudk/gomponents/internal/assert"
 )
 
 func TestInputHidden(t *testing.T) {

gomponents_test.go

@@ -9,7 +9,7 @@ import (
 	"testing"
 
 	g "github.com/maragudk/gomponents"
-	"github.com/maragudk/gomponents/assert"
+	"github.com/maragudk/gomponents/internal/assert"
 )
 
 func TestNodeFunc(t *testing.T) {

html/attributes_test.go

@@ -5,8 +5,8 @@ import (
 	"testing"
 
 	g "github.com/maragudk/gomponents"
-	"github.com/maragudk/gomponents/assert"
 	. "github.com/maragudk/gomponents/html"
+	"github.com/maragudk/gomponents/internal/assert"
 )
 
 func TestBooleanAttributes(t *testing.T) {

html/elements_test.go

@@ -6,8 +6,8 @@ import (
 	"testing"
 
 	g "github.com/maragudk/gomponents"
-	"github.com/maragudk/gomponents/assert"
 	. "github.com/maragudk/gomponents/html"
+	"github.com/maragudk/gomponents/internal/assert"
 )
 
 type erroringWriter struct{}

internal/assert/assert.go

@@ -10,17 +10,20 @@ import (
 
 // 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.Errorf("expected `%v` but got `%v`", expected, actual)
-		t.FailNow()
+		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.FailNow()
+		t.Fatal("error is nil")
 	}
 }

svg/attributes_test.go

@@ -5,7 +5,7 @@ import (
 	"testing"
 
 	g "github.com/maragudk/gomponents"
-	"github.com/maragudk/gomponents/assert"
+	"github.com/maragudk/gomponents/internal/assert"
 	. "github.com/maragudk/gomponents/svg"
 )
 

svg/elements_test.go

@@ -5,7 +5,7 @@ import (
 	"testing"
 
 	g "github.com/maragudk/gomponents"
-	"github.com/maragudk/gomponents/assert"
+	"github.com/maragudk/gomponents/internal/assert"
 	. "github.com/maragudk/gomponents/svg"
 )