web/sparkline: inline-SVG sparkline renderer (empty / single / multi)

2026-05-07 18:50:23 +01:00
parent bb2a88be24
commit db88c5a7d1
5 changed files with 145 additions and 0 deletions
@@ -0,0 +1,41 @@
+package sparkline
+
+import (
+	"os"
+	"path/filepath"
+	"strings"
+	"testing"
+)
+
+func loadGolden(t *testing.T, name string) string {
+	t.Helper()
+	b, err := os.ReadFile(filepath.Join("testdata", name))
+	if err != nil {
+		t.Fatalf("read golden %s: %v", name, err)
+	}
+	return strings.TrimRight(string(b), "\n")
+}
+
+func TestSparkline_Empty(t *testing.T) {
+	got := strings.TrimRight(string(RenderSparkline(nil, 80, 20)), "\n")
+	want := loadGolden(t, "empty.svg")
+	if got != want {
+		t.Errorf("empty sparkline mismatch:\nwant:\n%s\ngot:\n%s", want, got)
+	}
+}
+
+func TestSparkline_SinglePoint(t *testing.T) {
+	got := strings.TrimRight(string(RenderSparkline([]float64{100}, 80, 20)), "\n")
+	want := loadGolden(t, "single_point.svg")
+	if got != want {
+		t.Errorf("single_point sparkline mismatch:\nwant:\n%s\ngot:\n%s", want, got)
+	}
+}
+
+func TestSparkline_ThreePoints(t *testing.T) {
+	got := strings.TrimRight(string(RenderSparkline([]float64{10, 30, 20}, 80, 20)), "\n")
+	want := loadGolden(t, "three_points.svg")
+	if got != want {
+		t.Errorf("three_points sparkline mismatch:\nwant:\n%s\ngot:\n%s", want, got)
+	}
+}