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package dashboard
import (
"strings"
"testing"
)
func TestRenderSparklineEmptyOrInvalidWidth(t *testing.T) {
if got := renderSparkline(nil, 5); got != "" {
t.Fatalf("expected empty sparkline for nil data, got %q", got)
}
if got := renderSparkline([]float64{1, 2, 3}, 0); got != "" {
t.Fatalf("expected empty sparkline for width 0, got %q", got)
}
}
func TestRenderSparklineSingleValue(t *testing.T) {
got := renderSparkline([]float64{10}, 8)
if got != " \n █" {
t.Fatalf("expected two-line constant sparkline, got %q", got)
}
}
func TestRenderSparklineAllEqualValues(t *testing.T) {
got := renderSparkline([]float64{5, 5, 5, 5}, 4)
if got != " \n████" {
t.Fatalf("expected two-line flat sparkline, got %q", got)
}
}
func TestRenderSparklineRightAlignsShortHistory(t *testing.T) {
got := renderSparkline([]float64{1, 2, 3}, 6)
lines := strings.Split(got, "\n")
if len(lines) != 2 {
t.Fatalf("expected 2 lines, got %q", got)
}
if !strings.HasPrefix(lines[1], " ") {
t.Fatalf("expected left padding for short history, got %q", lines[1])
}
}
func TestRenderSparklineRespectsWidthTruncation(t *testing.T) {
got := renderSparkline([]float64{1, 2, 3, 4, 5, 6, 7, 8}, 4)
lines := strings.Split(got, "\n")
if len(lines) != 2 {
t.Fatalf("expected 2 lines, got %q", got)
}
if len([]rune(lines[0])) != 4 || len([]rune(lines[1])) != 4 {
t.Fatalf("expected 4 runes per line, got %q", got)
}
}
func TestSampleForWidthUsesRecentTail(t *testing.T) {
got := sampleForWidth([]float64{1, 2, 3, 4, 5, 6}, 3)
want := []float64{4, 5, 6}
if len(got) != len(want) {
t.Fatalf("expected tail length %d, got %d", len(want), len(got))
}
for i := range want {
if got[i] != want[i] {
t.Fatalf("expected tail %v, got %v", want, got)
}
}
}
func TestRenderSparklineSpansLowToHigh(t *testing.T) {
got := renderSparkline([]float64{0, 10}, 2)
lines := strings.Split(got, "\n")
if len(lines) != 2 {
t.Fatalf("expected 2 lines, got %q", got)
}
if !strings.Contains(got, "█") {
t.Fatalf("expected high bar, got %q", got)
}
}
func TestRenderLabeledSparklineAlignsSecondRow(t *testing.T) {
got := renderLabeledSparkline("Latency:", []float64{0, 10}, 2)
lines := strings.Split(got, "\n")
if len(lines) != 2 {
t.Fatalf("expected 2 lines, got %q", got)
}
if !strings.HasPrefix(lines[0], "Latency: ") {
t.Fatalf("expected label prefix on first row, got %q", lines[0])
}
if !strings.HasPrefix(lines[1], " ") {
t.Fatalf("expected padding on second row to align sparkline, got %q", lines[1])
}
}
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