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predicate_test.go
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predicate_test.go
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package streams
import (
"github.com/stretchr/testify/require"
"strings"
"testing"
)
func TestNewPredicate(t *testing.T) {
called := false
fp := NewPredicate[string](func(v string) bool {
called = true
return false
})
r := fp.Test("a")
require.False(t, r)
require.True(t, called)
fp = NewPredicate[string](nil)
r = fp.Test("a")
require.True(t, r)
}
func TestPredicate_Negate(t *testing.T) {
called := false
fp := NewPredicate[string](func(v string) bool {
called = true
return false
})
nfp := fp.Negate()
r := nfp.Test("a")
require.True(t, r)
require.True(t, called)
}
func TestPredicate_And(t *testing.T) {
firstCalled := false
secondCalled := false
tp2 := NewPredicate[string](func(v string) bool {
secondCalled = true
return true
})
tp := NewPredicate[string](func(v string) bool {
firstCalled = true
return true
}).And(tp2)
r := tp.Test("a")
require.True(t, r)
require.True(t, firstCalled)
require.True(t, secondCalled)
firstCalled = false
secondCalled = false
tp = NewPredicate[string](func(v string) bool {
firstCalled = true
return false
}).And(tp2)
r = tp.Test("a")
require.False(t, r)
require.True(t, firstCalled)
require.False(t, secondCalled)
}
func TestPredicate_Or(t *testing.T) {
firstCalled := false
secondCalled := false
tp2 := NewPredicate[string](func(v string) bool {
secondCalled = true
return true
})
tp := NewPredicate[string](func(v string) bool {
firstCalled = true
return false
}).Or(tp2)
r := tp.Test("a")
require.True(t, r)
require.True(t, firstCalled)
require.True(t, secondCalled)
firstCalled = false
secondCalled = false
tp = NewPredicate[string](func(v string) bool {
firstCalled = true
return true
}).Or(tp2)
r = tp.Test("a")
require.True(t, r)
require.True(t, firstCalled)
require.False(t, secondCalled)
}
func TestPredicate_AndOr(t *testing.T) {
callCount := 0
fp := NewPredicate[string](func(v string) bool {
callCount++
return false
})
tp := NewPredicate[string](func(v string) bool {
callCount++
return true
})
p := fp.And(fp).Or(tp)
r := p.Test("a")
require.True(t, r)
require.Equal(t, 2, callCount)
p = p.Negate()
r = p.Test("a")
require.False(t, r)
require.Equal(t, 4, callCount)
}
func TestPredicate_OrAnd(t *testing.T) {
callCount := 0
fp := NewPredicate[string](func(v string) bool {
callCount++
return false
})
tp := NewPredicate[string](func(v string) bool {
callCount++
return true
})
p := fp.Or(tp).And(tp)
r := p.Test("a")
require.True(t, r)
require.Equal(t, 3, callCount)
p = p.Negate()
r = p.Test("a")
require.False(t, r)
require.Equal(t, 6, callCount)
}
func TestPredicateFunc(t *testing.T) {
p := PredicateFunc[string](func(v string) bool {
return strings.ToUpper(v) == v
})
require.True(t, p.Test("A"))
require.False(t, p.Test("a"))
}
func TestPredicateFunc_Negate(t *testing.T) {
called := false
fp := PredicateFunc[string](func(v string) bool {
called = true
return false
})
nfp := fp.Negate()
r := nfp.Test("a")
require.True(t, r)
require.True(t, called)
}
func TestPredicateFunc_And(t *testing.T) {
firstCalled := false
secondCalled := false
tp2 := PredicateFunc[string](func(v string) bool {
secondCalled = true
return true
})
tp := PredicateFunc[string](func(v string) bool {
firstCalled = true
return true
}).And(tp2)
r := tp.Test("a")
require.True(t, r)
require.True(t, firstCalled)
require.True(t, secondCalled)
firstCalled = false
secondCalled = false
tp = PredicateFunc[string](func(v string) bool {
firstCalled = true
return false
}).And(tp2)
r = tp.Test("a")
require.False(t, r)
require.True(t, firstCalled)
require.False(t, secondCalled)
}
func TestPredicateFunc_Or(t *testing.T) {
firstCalled := false
secondCalled := false
tp2 := PredicateFunc[string](func(v string) bool {
secondCalled = true
return true
})
tp := PredicateFunc[string](func(v string) bool {
firstCalled = true
return false
}).Or(tp2)
r := tp.Test("a")
require.True(t, r)
require.True(t, firstCalled)
require.True(t, secondCalled)
firstCalled = false
secondCalled = false
tp = PredicateFunc[string](func(v string) bool {
firstCalled = true
return true
}).Or(tp2)
r = tp.Test("a")
require.True(t, r)
require.True(t, firstCalled)
require.False(t, secondCalled)
}
func TestPredicateFunc_AndOr(t *testing.T) {
callCount := 0
fp := PredicateFunc[string](func(v string) bool {
callCount++
return false
})
tp := PredicateFunc[string](func(v string) bool {
callCount++
return true
})
p := fp.And(fp).Or(tp)
r := p.Test("a")
require.True(t, r)
require.Equal(t, 2, callCount)
p = p.Negate()
r = p.Test("a")
require.False(t, r)
require.Equal(t, 4, callCount)
}
func TestPredicateFunc_OrAnd(t *testing.T) {
callCount := 0
fp := PredicateFunc[string](func(v string) bool {
callCount++
return false
})
tp := PredicateFunc[string](func(v string) bool {
callCount++
return true
})
p := fp.Or(tp).And(tp)
r := p.Test("a")
require.True(t, r)
require.Equal(t, 3, callCount)
p = p.Negate()
r = p.Test("a")
require.False(t, r)
require.Equal(t, 6, callCount)
}