test(01-02): add ui package smoke tests

- TestButton_DefaultSolidMD: asserts root class and label
- TestButton_PassesThroughAttrs: asserts hx-* attribute spread
- TestButton_ExplicitTypeSubmit: type override
- TestCard_RendersChildren: templ.WithChildren child injection
- TestBadge_{Info,Success}Variant + zero-value normalization
- TestButtonClass_String / TestBadgeClass_String: class contract
- TestNormalizers_ZeroValueDefaults: every Normalized* returns safe default

backend/internal/web/ui/ui_test.go

@@ -0,0 +1,132 @@
+package ui
+
+import (
+	"bytes"
+	"context"
+	"strings"
+	"testing"
+
+	"github.com/a-h/templ"
+)
+
+// render is a tiny helper that renders a templ.Component to a string for
+// substring assertions. Uses context.Background to match production calls.
+func render(t *testing.T, ctx context.Context, c templ.Component) string {
+	t.Helper()
+	var buf bytes.Buffer
+	if err := c.Render(ctx, &buf); err != nil {
+		t.Fatalf("render: unexpected error: %v", err)
+	}
+	return buf.String()
+}
+
+func TestButton_DefaultSolidMD(t *testing.T) {
+	out := render(t, context.Background(), Button(ButtonProps{Label: "Fetch server time"}))
+
+	wantClass := `class="ui-button ui-button-solid-default-md"`
+	if !strings.Contains(out, wantClass) {
+		t.Errorf("output missing class %q\ngot: %s", wantClass, out)
+	}
+	if !strings.Contains(out, "Fetch server time") {
+		t.Errorf("output missing label literal; got: %s", out)
+	}
+	if !strings.Contains(out, `type="button"`) {
+		t.Errorf("output missing default type=\"button\"; got: %s", out)
+	}
+}
+
+func TestButton_PassesThroughAttrs(t *testing.T) {
+	props := ButtonProps{
+		Label: "x",
+		Attrs: templ.Attributes{
+			"hx-get":    "/demo/time",
+			"hx-target": "#demo-out",
+		},
+	}
+	out := render(t, context.Background(), Button(props))
+
+	if !strings.Contains(out, `hx-get="/demo/time"`) {
+		t.Errorf("output missing hx-get; got: %s", out)
+	}
+	if !strings.Contains(out, `hx-target="#demo-out"`) {
+		t.Errorf("output missing hx-target; got: %s", out)
+	}
+}
+
+func TestButton_ExplicitTypeSubmit(t *testing.T) {
+	out := render(t, context.Background(), Button(ButtonProps{Label: "Go", Type: "submit"}))
+	if !strings.Contains(out, `type="submit"`) {
+		t.Errorf("expected type=\"submit\"; got: %s", out)
+	}
+}
+
+// Card injects children via templ.WithChildren. The test feeds a raw child
+// component through context and asserts the rendered wrapper + child content.
+func TestCard_RendersChildren(t *testing.T) {
+	child := templ.Raw("<p>x</p>")
+	ctx := templ.WithChildren(context.Background(), child)
+	out := render(t, ctx, Card(nil))
+
+	if !strings.Contains(out, `<section class="ui-card"`) {
+		t.Errorf("output missing <section class=\"ui-card\">; got: %s", out)
+	}
+	if !strings.Contains(out, "<p>x</p>") {
+		t.Errorf("output missing child markup; got: %s", out)
+	}
+}
+
+func TestBadge_InfoVariant(t *testing.T) {
+	out := render(t, context.Background(), Badge(BadgeProps{Label: "OK", Variant: BadgeVariantInfo}))
+	wantClass := `class="ui-badge ui-badge-info"`
+	if !strings.Contains(out, wantClass) {
+		t.Errorf("output missing %q; got: %s", wantClass, out)
+	}
+	if !strings.Contains(out, "OK") {
+		t.Errorf("output missing label; got: %s", out)
+	}
+}
+
+func TestBadge_SuccessVariant(t *testing.T) {
+	out := render(t, context.Background(), Badge(BadgeProps{Label: "OK", Variant: BadgeVariantSuccess}))
+	if !strings.Contains(out, "ui-badge-success") {
+		t.Errorf("output missing ui-badge-success; got: %s", out)
+	}
+}
+
+func TestBadge_ZeroValueDefaultsToInfo(t *testing.T) {
+	out := render(t, context.Background(), Badge(BadgeProps{Label: "OK"}))
+	if !strings.Contains(out, "ui-badge-info") {
+		t.Errorf("zero-value Variant should normalize to info; got: %s", out)
+	}
+}
+
+func TestButtonClass_String(t *testing.T) {
+	got := ButtonClass(ButtonVariantDefault, ButtonToneSolid, SizeMD)
+	want := "ui-button ui-button-solid-default-md"
+	if got != want {
+		t.Errorf("ButtonClass = %q; want %q", got, want)
+	}
+}
+
+func TestBadgeClass_String(t *testing.T) {
+	got := BadgeClass(BadgeVariantInfo)
+	want := "ui-badge ui-badge-info"
+	if got != want {
+		t.Errorf("BadgeClass = %q; want %q", got, want)
+	}
+}
+
+func TestNormalizers_ZeroValueDefaults(t *testing.T) {
+	if got := NormalizedSize(""); got != SizeMD {
+		t.Errorf("NormalizedSize(\"\") = %q; want %q", got, SizeMD)
+	}
+	if got := NormalizedButtonVariant(""); got != ButtonVariantDefault {
+		t.Errorf("NormalizedButtonVariant(\"\") = %q; want %q", got, ButtonVariantDefault)
+	}
+	if got := NormalizedButtonTone(""); got != ButtonToneSolid {
+		t.Errorf("NormalizedButtonTone(\"\") = %q; want %q", got, ButtonToneSolid)
+	}
+	if got := NormalizedBadgeVariant(""); got != BadgeVariantInfo {
+		t.Errorf("NormalizedBadgeVariant(\"\") = %q; want %q", got, BadgeVariantInfo)
+	}
+}