Charts I: components 101-120
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package mujica
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import (
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"math"
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"strings"
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"testing"
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"time"
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"github.com/egoist/mygo/ui"
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)
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type chartHarness struct {
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res ChartResult
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changes int
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disabled bool
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build func(c *ui.Context) ChartResult
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}
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func (h *chartHarness) view(c *ui.Context) {
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Use(c, Settings{Mode: Light})
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ui.Column(c).Padding(16).Width(480).Disabled(h.disabled).Children(func() {
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h.res = h.build(c)
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if h.res.Changed() {
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h.changes++
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}
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})
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}
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// chartReadout returns the readout line, the text after the plot.
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func chartReadout(tt *ui.Tester) string {
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texts := tt.Texts()
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return texts[len(texts)-1]
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}
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func lineSeries() []ChartSeries {
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return []ChartSeries{
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{Name: "Pews", Values: []float64{3, 5, math.NaN(), 4, 8}},
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{Name: "Candles", Values: []float64{5, 2, 6, 7, 1}},
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}
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}
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func TestLineChartKeyboardReadout(t *testing.T) {
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h := &chartHarness{build: func(c *ui.Context) ChartResult {
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return LineChart(c, lineSeries(), LineChartOptions{Frame: ChartFrame{Label: "Chapel"}})
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}}
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tt := ui.NewTester(h.view, 520, 420)
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if !strings.Contains(chartReadout(tt), "arrow keys") {
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t.Fatalf("hint %q", chartReadout(tt))
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}
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tabTo(t, tt, "Chapel")
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tt.Key(0, ui.KeyRight)
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tt.Key(0, ui.KeyRight)
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if got := chartReadout(tt); got != "1 · Pews 5 · Candles 2" || h.res.Point != 1 || h.changes != 2 {
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t.Fatalf("readout %q point %d", got, h.res.Point)
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}
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tt.Key(0, ui.KeyRight)
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if got := chartReadout(tt); got != "2 · Pews no value · Candles 6" {
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t.Fatalf("gap readout %q", got)
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}
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if a := tt.Announcements(); len(a) == 0 || a[len(a)-1] != "2 · Pews no value · Candles 6" {
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t.Fatalf("announcements %q", a)
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}
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tt.Key(0, ui.KeyEnd)
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tt.Key(0, ui.KeyRight)
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if h.res.Point != 4 {
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t.Fatalf("End then Right: %d", h.res.Point)
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}
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tt.Key(0, ui.KeyEscape)
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if h.res.Point != -1 {
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t.Fatalf("Escape kept point %d", h.res.Point)
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}
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}
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func TestLineChartHoverAndToggle(t *testing.T) {
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var toggled string
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h := &chartHarness{build: func(c *ui.Context) ChartResult {
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r := LineChart(c, lineSeries(), LineChartOptions{Frame: ChartFrame{Label: "Chapel"}, X: []float64{0, 10, 20, 30, 40}})
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if s, ok := r.Toggled(); ok {
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toggled = s
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}
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return r
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}}
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tt := ui.NewTester(h.view, 520, 420)
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b := h.res.Element.Bounds()
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// The plot spans 52..W-12; x 30 is three quarters across.
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px := b.X + 52 + (b.W-64)*0.75
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tt.Move(px, b.Y+b.H/2)
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if got := chartReadout(tt); got != "30 · Pews 4 · Candles 7" {
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t.Fatalf("hover readout %q", got)
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}
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if err := tt.Click("Candles"); err != nil {
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t.Fatal(err)
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}
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tt.Move(px, b.Y+b.H/2)
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if got := chartReadout(tt); got != "30 · Pews 4" || toggled != "Candles" {
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t.Fatalf("hidden series still read: %q toggled %q", got, toggled)
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}
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}
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func TestLineChartTimeAxisAndStates(t *testing.T) {
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t0 := time.Date(2026, 10, 5, 9, 0, 0, 0, time.UTC)
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times := []time.Time{t0, t0.Add(time.Hour), t0.Add(2 * time.Hour), t0.Add(3 * time.Hour), t0.Add(4 * time.Hour)}
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status := DataReady
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var series []ChartSeries
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var heights []float32
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h := &chartHarness{build: func(c *ui.Context) ChartResult {
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r := LineChart(c, series, LineChartOptions{Frame: ChartFrame{Label: "Chapel", Status: status}, Times: times[:len(series[0].Values)]})
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return r
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}}
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series = lineSeries()
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tt := ui.NewTester(h.view, 520, 420)
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tabTo(t, tt, "Chapel")
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tt.Key(0, ui.KeyRight)
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tt.Key(0, ui.KeyRight)
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if got := chartReadout(tt); !strings.HasPrefix(got, "2026-10-05 10:00:00 · ") {
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t.Fatalf("time readout %q", got)
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}
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heights = append(heights, h.res.Element.Bounds().H)
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for _, st := range []DataStatus{DataLoading, DataFailed} {
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status = st
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tt.Frame()
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heights = append(heights, h.res.Element.Bounds().H)
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}
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if !tt.HasText("Retry") || heights[0] != heights[1] || heights[1] != heights[2] {
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t.Fatalf("states changed size: %v", heights)
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}
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status, series = DataReady, []ChartSeries{{Name: "A", Values: []float64{math.NaN()}}}
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tt.Frame()
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if !tt.HasText("No data") {
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t.Fatalf("all-missing chart: %q", tt.Texts())
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}
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}
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func TestLineChartDisabledIgnoresKeys(t *testing.T) {
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h := &chartHarness{disabled: true, build: func(c *ui.Context) ChartResult {
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return LineChart(c, lineSeries(), LineChartOptions{Frame: ChartFrame{Label: "Chapel"}})
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}}
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tt := ui.NewTester(h.view, 520, 420)
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for range 4 {
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tt.Key(0, ui.KeyTab)
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tt.Key(0, ui.KeyRight)
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}
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if h.res.Point != -1 {
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t.Fatalf("disabled chart moved to %d", h.res.Point)
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}
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}
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func TestLineChartBadOptions(t *testing.T) {
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for name, build := range map[string]func(c *ui.Context){
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"lengths": func(c *ui.Context) {
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LineChart(c, []ChartSeries{{Name: "a", Values: []float64{1}}, {Name: "b"}}, LineChartOptions{Frame: ChartFrame{Label: "x"}})
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},
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"order": func(c *ui.Context) {
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LineChart(c, lineSeries(), LineChartOptions{Frame: ChartFrame{Label: "x"}, X: []float64{0, 2, 1, 3, 4}})
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},
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"no label": func(c *ui.Context) { LineChart(c, lineSeries(), LineChartOptions{}) },
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"duplicate": func(c *ui.Context) {
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LineChart(c, []ChartSeries{{Name: "a"}, {Name: "a"}}, LineChartOptions{Frame: ChartFrame{Label: "x"}})
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},
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} {
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func() {
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defer func() {
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if recover() == nil {
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t.Errorf("%s: no panic", name)
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}
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}()
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ui.NewTester(func(c *ui.Context) { Use(c, Settings{}); build(c) }, 300, 300)
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}()
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}
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}
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func TestLineChartLarge(t *testing.T) {
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vals := make([]float64, 100_000)
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for i := range vals {
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vals[i] = math.Sin(float64(i) / 500)
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}
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h := &chartHarness{build: func(c *ui.Context) ChartResult {
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return LineChart(c, []ChartSeries{{Name: "Wave", Values: vals}}, LineChartOptions{Frame: ChartFrame{Label: "Tide"}})
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}}
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tt := ui.NewTester(h.view, 520, 420)
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tabTo(t, tt, "Tide")
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tt.Key(0, ui.KeyEnd)
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if h.res.Point != 99_999 || !strings.HasPrefix(chartReadout(tt), "99999 · Wave ") {
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t.Fatalf("End: %d %q", h.res.Point, chartReadout(tt))
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}
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}
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func TestLineChartSnapshot(t *testing.T) {
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snapshot(t, "line_chart", 520, 340, func(c *ui.Context) {
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ui.Column(c).Padding(16).Children(func() {
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LineChart(c, lineSeries(), LineChartOptions{Frame: ChartFrame{Label: "Chapel", Height: 240}})
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})
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})
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}
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