1 files changed, 62 insertions, 0 deletions
diff --git a/components/components_test.go b/components/components_test.go
new file mode 100644
index 0000000..6420cab
--- /dev/null
+++ b/components/components_test.go
@@ -0,0 +1,62 @@
+package components_test
+
+import (
+	"os"
+	"testing"
+
+	g "github.com/maragudk/gomponents"
+	. "github.com/maragudk/gomponents/components"
+	. "github.com/maragudk/gomponents/html"
+	"github.com/maragudk/gomponents/internal/assert"
+)
+
+func TestHTML5(t *testing.T) {
+	t.Run("returns an html5 document template", func(t *testing.T) {
+		e := HTML5(HTML5Props{
+			Title:       "Hat",
+			Description: "Love hats.",
+			Language:    "en",
+			Head:        []g.Node{Link(Rel("stylesheet"), Href("/hat.css"))},
+			Body:        []g.Node{Div()},
+		})
+
+		assert.Equal(t, `<!doctype html><html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1"><title>Hat</title><meta name="description" content="Love hats."><link rel="stylesheet" href="/hat.css"></head><body><div></div></body></html>`, e)
+	})
+
+	t.Run("returns no language, description, and extra head/body elements if empty", func(t *testing.T) {
+		e := HTML5(HTML5Props{
+			Title: "Hat",
+		})
+
+		assert.Equal(t, `<!doctype html><html><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1"><title>Hat</title></head><body></body></html>`, e)
+	})
+}
+
+func TestClasses(t *testing.T) {
+	t.Run("given a map, returns sorted keys from the map with value true", func(t *testing.T) {
+		assert.Equal(t, ` class="boheme-hat hat partyhat"`, Classes{
+			"boheme-hat": true,
+			"hat":        true,
+			"partyhat":   true,
+			"turtlehat":  false,
+		})
+	})
+
+	t.Run("renders as attribute in an element", func(t *testing.T) {
+		e := g.El("div", Classes{"hat": true})
+		assert.Equal(t, `<div class="hat"></div>`, e)
+	})
+
+	t.Run("also works with fmt", func(t *testing.T) {
+		a := Classes{"hat": true}
+		if a.String() != ` class="hat"` {
+			t.FailNow()
+		}
+	})
+}
+
+func ExampleClasses() {
+	e := g.El("div", Classes{"party-hat": true, "boring-hat": false})
+	_ = e.Render(os.Stdout)
+	// Output: <div class="party-hat"></div>
+}