67 lines
2.4 KiB
Go
67 lines
2.4 KiB
Go
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package basic
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import (
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"testing"
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"time"
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)
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// 对齐网格是导出行为（等时线按整刻度取值）的契约，取值本身写成字面量以免与实际生成函数互相自证。
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func TestGreatestTimeContourAlignedLevelsGridContracts(t *testing.T) {
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tt := func(hour, minute int) float64 {
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return TD2UT(Date2JDE(time.Date(2024, 1, 1, hour, minute, 0, 0, time.UTC)), true)
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}
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cases := []struct {
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name string
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start, end float64
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step time.Duration
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maxLevels int
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want []string
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}{
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{
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name: "起点在刻度之间时从下一个整刻度开始", start: tt(0, 7), end: tt(2, 7),
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step: 30 * time.Minute, maxLevels: 64,
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want: []string{"2024-01-01T00:30:00Z", "2024-01-01T01:00:00Z", "2024-01-01T01:30:00Z", "2024-01-01T02:00:00Z"},
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},
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{
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name: "起点恰在刻度上时不重复生成该刻度", start: tt(0, 30), end: tt(2, 0),
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step: 30 * time.Minute, maxLevels: 64,
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want: []string{"2024-01-01T00:30:00Z", "2024-01-01T01:00:00Z", "2024-01-01T01:30:00Z", "2024-01-01T02:00:00Z"},
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},
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{
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name: "终点恰在刻度上时包含终点", start: tt(0, 7), end: tt(1, 30),
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step: 30 * time.Minute, maxLevels: 64,
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want: []string{"2024-01-01T00:30:00Z", "2024-01-01T01:00:00Z", "2024-01-01T01:30:00Z"},
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},
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{
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name: "上限截断", start: tt(0, 7), end: tt(5, 7),
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step: 30 * time.Minute, maxLevels: 3,
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want: []string{"2024-01-01T00:30:00Z", "2024-01-01T01:00:00Z", "2024-01-01T01:30:00Z"},
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},
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{
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name: "窗口内没有整刻度时为空", start: tt(0, 1), end: tt(0, 20),
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step: time.Hour, maxLevels: 64,
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want: nil,
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},
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{
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name: "非正步长或倒置窗口为空", start: tt(0, 7), end: tt(2, 7),
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step: 0, maxLevels: 64, want: nil,
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},
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}
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for _, testCase := range cases {
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levels := greatestTimeContourAlignedLevels(testCase.start, testCase.end, testCase.step, testCase.maxLevels)
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if len(levels) != len(testCase.want) {
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t.Fatalf("%s: %d levels, want %d", testCase.name, len(levels), len(testCase.want))
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}
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for index, level := range levels {
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got := level.at.UTC().Format(time.RFC3339)
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if got != testCase.want[index] {
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t.Fatalf("%s: level %d at %s, want %s", testCase.name, index, got, testCase.want[index])
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}
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// 标注时刻与求根时刻必须成对：TT 往返 1 ULP 内一致。
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if roundTrip := greatestTimeContourUTCToTT(level.at); roundTrip != level.tt {
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t.Fatalf("%s: level %d tt %.9f != %.9f", testCase.name, index, level.tt, roundTrip)
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}
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}
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}
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}
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