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most-specific-period/msp/changeover_test.go
Tai Groot 8b431b5d2f chore: bump Go 1.18→1.26, fix typos, clean up tests 
- Update go.mod to Go 1.26
- Fix help text typos ('menut' → 'menu', 'most-significant' → 'most-specific')
- Fix error comment typo ('ll' → 'all')
- Remove unnecessary fmt.Sprintf in test names
- Remove unused fmt imports from test files
- Add compile-time interface check for TimeWindow
2026-02-22 21:01:23 +00:00

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package msp
import (
"testing"
"time"
)
func slicesEqual[K comparable](x []K, y []K) bool {
if len(x) != len(y) {
return false
}
for i, w := range x {
if w != y[i] {
return false
}
}
return true
}
func TestGetChangeOvers(t *testing.T) {
// use a static timestamp to make sure tests don't fail on slower systems or during a process pause
now := time.Now()
testCases := []struct {
ts time.Time
testID string
result []time.Time
periods []Period
}{
{
testID: "No choices",
ts: now,
result: []time.Time{},
periods: []Period{},
},
{
testID: "Two Choices, shorter is second",
ts: now,
result: []time.Time{now.Add(-5 * time.Minute), now.Add(-2 * time.Minute), now.Add(time.Minute)},
periods: []Period{
TimeWindow{
StartTime: now.Add(-5 * time.Minute),
EndTime: now.Add(time.Minute),
Identifier: "A",
},
TimeWindow{
StartTime: now.Add(-2 * time.Minute),
EndTime: now.Add(time.Minute),
Identifier: "B",
},
},
},
{
testID: "Two Choices, one is a year, other a minute",
ts: now,
result: []time.Time{now.Add(-1 * time.Hour * 24 * 365), now.Add(-5 * time.Minute), now.Add(time.Minute)},
periods: []Period{
TimeWindow{
StartTime: now.Add(-1 * time.Hour * 24 * 365),
EndTime: now.Add(time.Minute),
Identifier: "A",
},
TimeWindow{
StartTime: now.Add(-5 * time.Minute),
EndTime: now.Add(time.Minute),
Identifier: "B",
},
},
},
{
testID: "Two Choices, shorter is first",
ts: now,
result: []time.Time{now.Add(-5 * time.Minute), now.Add(-2 * time.Minute), now.Add(time.Minute)},
periods: []Period{
TimeWindow{
StartTime: now.Add(-2 * time.Minute),
EndTime: now.Add(time.Minute),
Identifier: "A",
},
TimeWindow{
StartTime: now.Add(-5 * time.Minute),
EndTime: now.Add(time.Minute),
Identifier: "B",
},
},
},
{
testID: "Two Choices, one in the past",
ts: now,
result: []time.Time{now.Add(-2 * time.Minute), now.Add(-time.Minute), now.Add(time.Minute)},
periods: []Period{
TimeWindow{
StartTime: now.Add(-time.Minute),
EndTime: now.Add(time.Minute),
Identifier: "A",
},
TimeWindow{
StartTime: now.Add(-2 * time.Minute),
EndTime: now.Add(-time.Minute),
Identifier: "B",
},
},
},
{
testID: "Two Choices, one invalid",
ts: now,
result: []time.Time{now.Add(-2 * time.Minute), now.Add(time.Minute)},
periods: []Period{
TimeWindow{
StartTime: now.Add(time.Minute),
EndTime: now.Add(-time.Minute),
Identifier: "A",
},
TimeWindow{
StartTime: now.Add(-2 * time.Minute),
EndTime: now.Add(time.Minute),
Identifier: "B",
},
},
},
{
testID: "Two Choices, Identical periods",
ts: now,
result: []time.Time{now.Add(-time.Minute), now.Add(time.Minute)},
periods: []Period{
TimeWindow{
StartTime: now.Add(-time.Minute),
EndTime: now.Add(time.Minute),
Identifier: "A",
},
TimeWindow{
StartTime: now.Add(-time.Minute),
EndTime: now.Add(time.Minute),
Identifier: "B",
},
},
},
{
testID: "One choice",
ts: now,
result: []time.Time{now.Add(-time.Minute), now.Add(time.Minute)},
periods: []Period{TimeWindow{
StartTime: now.Add(-time.Minute),
EndTime: now.Add(time.Minute),
Identifier: "A",
}},
},
}
for _, tc := range testCases {
t.Run(tc.testID, func(t *testing.T) {
changeovers := GetChangeOvers(tc.periods...)
if !slicesEqual(changeovers, tc.result) {
t.Errorf("Expected %v but got %v", tc.result, changeovers)
}
})
}
}
func TestFlattenPeriods(t *testing.T) {
// use a static timestamp to make sure tests don't fail on slower systems or during a process pause
now := time.Now()
testCases := []struct {
ts time.Time
testID string
result []string
err error
periods []Period
}{
{
testID: "No choices",
ts: now,
result: []string{},
err: ErrNoValidPeriods,
periods: []Period{},
},
{
testID: "Two Choices, shorter is second",
ts: now,
result: []string{"A", "B"},
err: nil,
periods: []Period{
TimeWindow{
StartTime: now.Add(-5 * time.Minute),
EndTime: now.Add(time.Minute),
Identifier: "A",
},
TimeWindow{
StartTime: now.Add(-2 * time.Minute),
EndTime: now.Add(time.Minute),
Identifier: "B",
},
},
},
{
testID: "Two Choices, one is a year, other a minute",
ts: now,
result: []string{"A", "B"},
err: nil,
periods: []Period{
TimeWindow{
StartTime: now.Add(-1 * time.Hour * 24 * 365),
EndTime: now.Add(time.Minute),
Identifier: "A",
},
TimeWindow{
StartTime: now.Add(-5 * time.Minute),
EndTime: now.Add(time.Minute),
Identifier: "B",
},
},
},
{
testID: "Two Choices, shorter is first",
ts: now,
result: []string{"B", "A"},
err: nil,
periods: []Period{
TimeWindow{
StartTime: now.Add(-2 * time.Minute),
EndTime: now.Add(time.Minute),
Identifier: "A",
},
TimeWindow{
StartTime: now.Add(-5 * time.Minute),
EndTime: now.Add(time.Minute),
Identifier: "B",
},
},
},
{
testID: "Two Choices, one in the past",
ts: now,
result: []string{"B", "A"},
err: nil,
periods: []Period{
TimeWindow{
StartTime: now.Add(-time.Minute),
EndTime: now.Add(time.Minute),
Identifier: "A",
},
TimeWindow{
StartTime: now.Add(-2 * time.Minute),
EndTime: now.Add(-time.Minute),
Identifier: "B",
},
},
},
{
testID: "Two Choices, one invalid",
ts: now,
result: []string{"B"},
err: nil,
periods: []Period{
TimeWindow{
StartTime: now.Add(time.Minute),
EndTime: now.Add(-time.Minute),
Identifier: "A",
},
TimeWindow{
StartTime: now.Add(-2 * time.Minute),
EndTime: now.Add(time.Minute),
Identifier: "B",
},
},
},
{
testID: "Two Choices, Identical periods",
ts: now,
result: []string{"B"},
err: nil,
periods: []Period{
TimeWindow{
StartTime: now.Add(-time.Minute),
EndTime: now.Add(time.Minute),
Identifier: "A",
},
TimeWindow{
StartTime: now.Add(-time.Minute),
EndTime: now.Add(time.Minute),
Identifier: "B",
},
},
},
{
testID: "Triple Nested Periods",
ts: now,
result: []string{"A", "B", "C", "B", "A"},
err: nil,
periods: []Period{
TimeWindow{
StartTime: now.Add(-15 * time.Minute),
EndTime: now.Add(15 * time.Minute),
Identifier: "A",
},
TimeWindow{
StartTime: now.Add(-5 * time.Minute),
EndTime: now.Add(5 * time.Minute),
Identifier: "C",
},
TimeWindow{
StartTime: now.Add(-10 * time.Minute),
EndTime: now.Add(10 * time.Minute),
Identifier: "B",
},
},
},
{
testID: "One choice",
ts: now,
result: []string{"A"},
err: nil,
periods: []Period{TimeWindow{
StartTime: now.Add(-time.Minute),
EndTime: now.Add(time.Minute),
Identifier: "A",
}},
},
}
for _, tc := range testCases {
t.Run(tc.testID, func(t *testing.T) {
changeovers := FlattenPeriods(tc.periods...)
if !slicesEqual(changeovers, tc.result) {
t.Errorf("Expected %v but got %v", tc.result, changeovers)
}
})
}
}
func TestGetNextChangeOver(t *testing.T) {
// use a static timestamp to make sure tests don't fail on slower systems or during a process pause
now := time.Now()
testCases := []struct {
ts time.Time
testID string
result time.Time
err error
periods []Period
}{
{
testID: "No choices",
ts: now,
result: time.Time{},
err: ErrNoNextChangeover,
periods: []Period{},
},
{
testID: "Two Choices, shorter is second",
ts: now,
result: now.Add(time.Minute),
err: nil,
periods: []Period{
TimeWindow{
StartTime: now.Add(-5 * time.Minute),
EndTime: now.Add(time.Minute),
Identifier: "A",
},
TimeWindow{
StartTime: now.Add(-2 * time.Minute),
EndTime: now.Add(time.Minute),
Identifier: "B",
},
},
},
{
testID: "Two Choices, one is a year, other a minute",
ts: now,
result: now.Add(time.Minute),
err: nil,
periods: []Period{
TimeWindow{
StartTime: now.Add(-1 * time.Hour * 24 * 365),
EndTime: now.Add(time.Minute),
Identifier: "A",
},
TimeWindow{
StartTime: now.Add(-5 * time.Minute),
EndTime: now.Add(time.Minute),
Identifier: "B",
},
},
},
{
testID: "Two Choices, shorter is first",
ts: now,
result: now.Add(time.Minute),
err: nil,
periods: []Period{
TimeWindow{
StartTime: now.Add(-2 * time.Minute),
EndTime: now.Add(time.Minute),
Identifier: "A",
},
TimeWindow{
StartTime: now.Add(-5 * time.Minute),
EndTime: now.Add(time.Minute),
Identifier: "B",
},
},
},
{
testID: "Two Choices, one in the past",
ts: now,
result: now.Add(time.Minute),
err: nil,
periods: []Period{
TimeWindow{
StartTime: now.Add(-time.Minute),
EndTime: now.Add(time.Minute),
Identifier: "A",
},
TimeWindow{
StartTime: now.Add(-2 * time.Minute),
EndTime: now.Add(-time.Minute),
Identifier: "B",
},
},
},
{
testID: "Two Choices, one invalid",
ts: now,
result: now.Add(time.Minute),
err: nil,
periods: []Period{
TimeWindow{
StartTime: now.Add(time.Minute),
EndTime: now.Add(-time.Minute),
Identifier: "A",
},
TimeWindow{
StartTime: now.Add(-2 * time.Minute),
EndTime: now.Add(time.Minute),
Identifier: "B",
},
},
},
{
testID: "Two Choices, Identical periods",
ts: now,
result: now.Add(time.Minute),
err: nil,
periods: []Period{
TimeWindow{
StartTime: now.Add(-time.Minute),
EndTime: now.Add(time.Minute),
Identifier: "A",
},
TimeWindow{
StartTime: now.Add(-time.Minute),
EndTime: now.Add(time.Minute),
Identifier: "B",
},
},
},
{
testID: "One choice",
ts: now,
result: now.Add(time.Minute),
err: nil,
periods: []Period{TimeWindow{
StartTime: now.Add(-time.Minute),
EndTime: now.Add(time.Minute),
Identifier: "A",
}},
},
}
for _, tc := range testCases {
t.Run(tc.testID, func(t *testing.T) {
ts, err := GetNextChangeOver(now, tc.periods...)
if tc.err != err {
t.Errorf("Error %v does not match expected %v", tc.err, err)
}
if ts != tc.result {
t.Errorf("Got %v but expected %v", ts, tc.result)
}
})
}
}
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