133 lines
3.5 KiB
Go
133 lines
3.5 KiB
Go
package drawtool
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import (
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"testing"
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"git.kirsle.net/go/render"
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)
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func TestHistory(t *testing.T) {
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// Test assertion helpers.
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shouldBool := func(note string, expect, actual bool) {
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if actual != expect {
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t.Errorf(
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"Unexpected boolean result (%s)\n"+
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"Expected: %+v\n"+
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" Got: %+v",
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note,
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expect,
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actual,
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)
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}
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}
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shouldInt := func(note string, expect, actual int) {
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if actual != expect {
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t.Errorf(
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"Unexpected integer result (%s)\n"+
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"Expected: %+v\n"+
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" Got: %+v",
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note,
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expect,
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actual,
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)
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}
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}
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shouldPoint := func(note string, expect render.Point, actual *Stroke) {
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if actual == nil {
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t.Errorf("Missing history stroke for shouldPoint(%s)", note)
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return
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}
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if actual.PointA != expect {
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t.Errorf(
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"Unexpected point result (%s)\n"+
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"Expected: %+v\n"+
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" Got: %+v",
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note,
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expect,
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actual.PointA,
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)
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}
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}
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var H = NewHistory(10)
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// Add and remove and re-add the first element.
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H.AddStroke(&Stroke{
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PointA: render.NewPoint(999, 999),
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})
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shouldInt("first element", 1, H.Size())
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shouldBool("can undo first element", true, H.Undo())
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shouldBool("latest should be null", true, H.Latest() == nil)
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H = NewHistory(10)
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shouldBool("can't Undo with fresh history", false, H.Undo())
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shouldInt("size should be zero", 0, H.Size())
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H.AddStroke(&Stroke{
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PointA: render.NewPoint(1, 1),
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})
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shouldInt("after first stroke", 1, H.Size())
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shouldPoint("head is the newest point", render.NewPoint(1, 1), H.Latest())
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H.AddStroke(&Stroke{
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PointA: render.NewPoint(2, 2),
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})
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shouldInt("after second stroke", 2, H.Size())
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shouldPoint("head is the newest point", render.NewPoint(2, 2), H.Latest())
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// Undo.
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shouldBool("undo second stroke", true, H.Undo())
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shouldInt("after undo the future stroke is still part of the size", 2, H.Size())
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shouldPoint("after undo, the newest point", render.NewPoint(1, 1), H.Latest())
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// Redo.
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shouldBool("redo second stroke", true, H.Redo())
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shouldInt("after redo second stroke, size is still the same", 2, H.Size())
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shouldPoint("after redo, the newest point", render.NewPoint(2, 2), H.Latest())
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// Another redo must fail.
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shouldBool("redo when there is nothing to redo", false, H.Redo())
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// Add a few more points.
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for i := 3; i <= 6; i++ {
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H.AddStroke(&Stroke{
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PointA: render.NewPoint(i, i),
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})
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}
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shouldInt("after adding more strokes", 6, H.Size())
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shouldPoint("last point added", render.NewPoint(6, 6), H.Latest())
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// Undo a few times.
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shouldBool("undo^1", true, H.Undo())
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shouldBool("undo^2", true, H.Undo())
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shouldBool("undo^3", true, H.Undo())
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shouldInt("after a few undos, the size still contains future history", 6, H.Size())
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// A new stroke invalidates the future history.
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H.AddStroke(&Stroke{
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PointA: render.NewPoint(7, 7),
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})
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shouldInt("after new history, size is recapped to tail", 4, H.Size())
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shouldBool("can't Redo after new point added", false, H.Redo())
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// Overflow past our history size to test rollover.
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for i := 8; i <= 16; i++ {
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H.AddStroke(&Stroke{
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PointA: render.NewPoint(i, i),
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})
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}
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shouldInt("after tons of new history, size is capped out", 10, H.Size())
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shouldPoint("after overflow, latest point", render.NewPoint(16, 16), H.Latest())
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shouldPoint("after overflow, first point", render.NewPoint(7, 7), H.Oldest())
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// Undo back to beginning.
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for i := 0; i < H.Size(); i++ {
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shouldBool("bulk undo to beginning", true, H.Undo())
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}
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shouldBool("after bulk undo, tail", true, H.Latest() == nil)
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shouldBool("can't undo further", false, H.Undo())
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}
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