83 lines
1.3 KiB
Go
83 lines
1.3 KiB
Go
package internal
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import "testing"
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func TestDeque(t *testing.T) {
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t.Run("pop", func(t *testing.T) {
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var dq Deque[int]
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dq.Push(1)
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dq.Push(2)
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if dq.Pop() != 2 {
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t.Error("Didn't pop 2 first")
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}
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if dq.Pop() != 1 {
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t.Error("Didn't pop 1 second")
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}
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if dq.Pop() != 0 {
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t.Error("Didn't pop zero")
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}
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})
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t.Run("shift", func(t *testing.T) {
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var td Deque[int]
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td.Push(1)
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td.Push(2)
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if td.Shift() != 1 {
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t.Error("Didn't shift 1 first")
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}
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if td.Shift() != 2 {
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t.Error("Didn't shift b second")
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}
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if td.Shift() != 0 {
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t.Error("Didn't shift zero")
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}
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})
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t.Run("push", func(t *testing.T) {
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var td Deque[int]
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td.Push(1)
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td.Push(2)
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td.Shift()
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for i := 1; i <= 12; i++ {
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td.Push(i)
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}
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if td.Shift() != 2 {
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t.Error("Didn't shift 2 first")
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}
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for i := 1; i <= 12; i++ {
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if v := td.Shift(); v != i {
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t.Fatalf("Shifted %d at pos %d", v, i)
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}
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}
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})
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t.Run("grow", func(t *testing.T) {
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var td Deque[int]
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td.Push(1)
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td.Push(2)
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td.Push(3)
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td.Shift()
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td.Grow(7)
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if len(td.elems) < 9 {
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t.Fatal("Expected at least 9 elements, got", len(td.elems))
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}
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if cap(td.elems)&(cap(td.elems)-1) != 0 {
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t.Fatalf("Capacity %d is not a power of two", cap(td.elems))
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}
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if td.Shift() != 2 || td.Shift() != 3 {
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t.Fatal("Elements don't match after grow")
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}
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})
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}
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