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package collections
import (
"testing"
qt "github.com/frankban/quicktest"
)
func TestNewStack(t *testing.T) {
t.Parallel()
c := qt.New(t)
s := NewStack[int]()
c.Assert(s, qt.IsNotNil)
}
func TestStackBasic(t *testing.T) {
t.Parallel()
c := qt.New(t)
s := NewStack[int]()
c.Assert(s.Len(), qt.Equals, 0)
s.Push(1)
s.Push(2)
s.Push(3)
c.Assert(s.Len(), qt.Equals, 3)
top, ok := s.Peek()
c.Assert(ok, qt.Equals, true)
c.Assert(top, qt.Equals, 3)
popped, ok := s.Pop()
c.Assert(ok, qt.Equals, true)
c.Assert(popped, qt.Equals, 3)
c.Assert(s.Len(), qt.Equals, 2)
_, _ = s.Pop()
_, _ = s.Pop()
_, ok = s.Pop()
c.Assert(ok, qt.Equals, false)
}
func TestStackDrain(t *testing.T) {
t.Parallel()
c := qt.New(t)
s := NewStack[string]()
s.Push("a")
s.Push("b")
got := s.Drain()
c.Assert(got, qt.DeepEquals, []string{"a", "b"})
c.Assert(s.Len(), qt.Equals, 0)
}
func TestStackDrainMatching(t *testing.T) {
t.Parallel()
c := qt.New(t)
s := NewStack[int]()
s.Push(1)
s.Push(2)
s.Push(3)
s.Push(4)
got := s.DrainMatching(func(v int) bool { return v%2 == 0 })
c.Assert(got, qt.DeepEquals, []int{4, 2})
c.Assert(s.Drain(), qt.DeepEquals, []int{1, 3})
}
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