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maybe_test.go
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maybe_test.go
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package fpgo
import (
"errors"
"reflect"
"testing"
"github.com/stretchr/testify/assert"
)
func TestIsPresent(t *testing.T) {
var m MaybeDef[interface{}]
m = Maybe.Just(1)
assert.Equal(t, true, m.IsPresent())
assert.Equal(t, false, m.IsNil())
m = Maybe.Just(nil)
assert.Equal(t, false, m.IsPresent())
assert.Equal(t, true, m.IsNil())
i := 1
var iptr *int
iptr = nil
m = Maybe.Just(iptr)
assert.Equal(t, false, m.IsPresent())
assert.Equal(t, true, m.IsNil())
iptr = &i
m = Maybe.Just(iptr)
assert.Equal(t, true, m.IsPresent())
assert.Equal(t, false, m.IsNil())
}
func TestOr(t *testing.T) {
var m MaybeDef[interface{}]
m = Maybe.Just(1)
assert.Equal(t, 1, m.Or(3))
m = Maybe.Just(nil)
assert.Equal(t, 3, m.Or(3))
}
func TestClone(t *testing.T) {
var m MaybeDef[interface{}]
i := 1
i2 := 2
temp := 3
var iptr *int
var iptr2 *int
iptr2 = &i2
m = Maybe.Just(1)
assert.Equal(t, 1, m.Clone().Unwrap())
assert.Equal(t, 3, temp)
m = Maybe.Just(1)
assert.Equal(t, 1, m.Clone().Unwrap())
assert.Equal(t, 2, *iptr2)
m = Maybe.Just(nil)
assert.Equal(t, nil, m.Clone().Unwrap())
assert.Equal(t, 2, *iptr2)
iptr = nil
m = Maybe.Just(iptr)
assert.Equal(t, nil, m.Clone().UnwrapInterface())
assert.Equal(t, true, m.IsNil())
assert.Equal(t, 2, *iptr2)
iptr = &i
m = Maybe.Just(iptr)
assert.Equal(t, 1, *CloneTo(m, interface{}(iptr2)).ToPtr())
assert.Equal(t, 1, *iptr2)
}
func TestFlatMap(t *testing.T) {
var m MaybeDef[interface{}]
m = Maybe.Just(1).FlatMap(func(in interface{}) MaybeDef[interface{}] {
v, _ := Maybe.Just(in).ToInt()
result := Maybe.Just(v + 1)
return result
})
assert.Equal(t, 2, m.Unwrap())
}
func TestLet(t *testing.T) {
var m MaybeDef[interface{}]
var letVal int
letVal = 1
m = Maybe.Just(1)
m.Let(func() {
letVal = 2
})
assert.Equal(t, 2, letVal)
letVal = 1
m = Maybe.Just(nil)
m.Let(func() {
letVal = 3
})
assert.Equal(t, 1, letVal)
}
func TestType(t *testing.T) {
var m MaybeDef[interface{}]
m = Maybe.Just(1)
assert.Equal(t, reflect.Int, m.Kind())
assert.Equal(t, true, m.IsKind(reflect.Int))
assert.Equal(t, false, m.IsKind(reflect.Ptr))
assert.Equal(t, reflect.TypeOf(1), m.Type())
assert.Equal(t, true, m.IsType(reflect.TypeOf(1)))
assert.Equal(t, false, m.IsType(reflect.TypeOf(nil)))
m = Maybe.Just(nil)
assert.Equal(t, reflect.Invalid, m.Kind())
assert.Equal(t, false, m.IsKind(reflect.Int))
assert.Equal(t, true, m.IsKind(reflect.Invalid))
assert.Equal(t, reflect.TypeOf(nil), m.Type())
assert.Equal(t, true, m.IsType(reflect.TypeOf(nil)))
assert.Equal(t, false, m.IsType(reflect.TypeOf(1)))
}
func TestCast(t *testing.T) {
var m MaybeDef[interface{}]
var f32 float32
var f64 float64
var b bool
var i int
var i32 int32
var i64 int64
var err error
// Int
m = Maybe.Just(1)
assert.Equal(t, "1", m.ToString())
f32, err = m.ToFloat32()
assert.Equal(t, float32(1), f32)
assert.Equal(t, nil, err)
f64, err = m.ToFloat64()
assert.Equal(t, float64(1), f64)
assert.Equal(t, nil, err)
i, err = m.ToInt()
assert.Equal(t, 1, i)
assert.Equal(t, nil, err)
i32, err = m.ToInt32()
assert.Equal(t, int32(1), i32)
assert.Equal(t, nil, err)
i64, err = m.ToInt64()
assert.Equal(t, int64(1), i64)
assert.Equal(t, nil, err)
b, err = m.ToBool()
assert.Equal(t, true, b)
assert.Equal(t, nil, err)
// Int32
m = Maybe.Just(int32(1))
assert.Equal(t, "1", m.ToString())
f32, err = m.ToFloat32()
assert.Equal(t, float32(1), f32)
assert.Equal(t, nil, err)
f64, err = m.ToFloat64()
assert.Equal(t, float64(1), f64)
assert.Equal(t, nil, err)
i, err = m.ToInt()
assert.Equal(t, 1, i)
assert.Equal(t, nil, err)
i32, err = m.ToInt32()
assert.Equal(t, int32(1), i32)
assert.Equal(t, nil, err)
i64, err = m.ToInt64()
assert.Equal(t, int64(1), i64)
assert.Equal(t, nil, err)
b, err = m.ToBool()
assert.Equal(t, true, b)
assert.Equal(t, nil, err)
// Int64
m = Maybe.Just(int64(1))
assert.Equal(t, "1", m.ToString())
f32, err = m.ToFloat32()
assert.Equal(t, float32(1), f32)
assert.Equal(t, nil, err)
f64, err = m.ToFloat64()
assert.Equal(t, float64(1), f64)
assert.Equal(t, nil, err)
i, err = m.ToInt()
assert.Equal(t, 1, i)
assert.Equal(t, nil, err)
i32, err = m.ToInt32()
assert.Equal(t, int32(1), i32)
assert.Equal(t, nil, err)
i64, err = m.ToInt64()
assert.Equal(t, int64(1), i64)
assert.Equal(t, nil, err)
b, err = m.ToBool()
assert.Equal(t, true, b)
assert.Equal(t, nil, err)
// Float32
m = Maybe.Just(float32(1.1))
assert.Equal(t, "1.1", m.ToString())
f32, err = m.ToFloat32()
assert.Equal(t, float32(1.1), f32)
assert.Equal(t, nil, err)
f64, err = m.ToFloat64()
assert.Equal(t, float64(1.100000023841858), f64)
assert.Equal(t, nil, err)
i, err = m.ToInt()
assert.Equal(t, 1, i)
assert.Equal(t, nil, err)
i32, err = m.ToInt32()
assert.Equal(t, int32(1), i32)
assert.Equal(t, nil, err)
i64, err = m.ToInt64()
assert.Equal(t, int64(1), i64)
assert.Equal(t, nil, err)
b, err = m.ToBool()
assert.Equal(t, true, b)
assert.Equal(t, nil, err)
// Float64
m = Maybe.Just(float64(1.2))
assert.Equal(t, "1.2", m.ToString())
f32, err = m.ToFloat32()
assert.Equal(t, float32(1.2), f32)
assert.Equal(t, nil, err)
f64, err = m.ToFloat64()
assert.Equal(t, float64(1.2), f64)
assert.Equal(t, nil, err)
i, err = m.ToInt()
assert.Equal(t, 1, i)
assert.Equal(t, nil, err)
i32, err = m.ToInt32()
assert.Equal(t, int32(1), i32)
assert.Equal(t, nil, err)
i64, err = m.ToInt64()
assert.Equal(t, int64(1), i64)
assert.Equal(t, nil, err)
b, err = m.ToBool()
assert.Equal(t, true, b)
assert.Equal(t, nil, err)
// Bool(true)
m = Maybe.Just(true)
assert.Equal(t, "true", m.ToString())
f32, err = m.ToFloat32()
assert.Equal(t, float32(1), f32)
assert.Equal(t, nil, err)
f64, err = m.ToFloat64()
assert.Equal(t, float64(1), f64)
assert.Equal(t, nil, err)
i, err = m.ToInt()
assert.Equal(t, 1, i)
assert.Equal(t, nil, err)
i32, err = m.ToInt32()
assert.Equal(t, int32(1), i32)
assert.Equal(t, nil, err)
i64, err = m.ToInt64()
assert.Equal(t, int64(1), i64)
assert.Equal(t, nil, err)
b, err = m.ToBool()
assert.Equal(t, true, b)
assert.Equal(t, nil, err)
// Bool(false)
m = Maybe.Just(false)
assert.Equal(t, "false", m.ToString())
f32, err = m.ToFloat32()
assert.Equal(t, float32(0), f32)
assert.Equal(t, nil, err)
f64, err = m.ToFloat64()
assert.Equal(t, float64(0), f64)
assert.Equal(t, nil, err)
i, err = m.ToInt()
assert.Equal(t, 0, i)
assert.Equal(t, nil, err)
i32, err = m.ToInt32()
assert.Equal(t, int32(0), i32)
assert.Equal(t, nil, err)
i64, err = m.ToInt64()
assert.Equal(t, int64(0), i64)
assert.Equal(t, nil, err)
b, err = m.ToBool()
assert.Equal(t, false, b)
assert.Equal(t, nil, err)
// Nil
m = Maybe.Just(nil)
assert.Equal(t, "<nil>", m.ToString())
f32, err = m.ToFloat32()
assert.Equal(t, float32(0), f32)
assert.Equal(t, errors.New("<nil>"), err)
f64, err = m.ToFloat64()
assert.Equal(t, float64(0), f64)
assert.Equal(t, errors.New("<nil>"), err)
i, err = m.ToInt()
assert.Equal(t, 0, i)
assert.Equal(t, errors.New("<nil>"), err)
i32, err = m.ToInt32()
assert.Equal(t, int32(0), i32)
assert.Equal(t, errors.New("<nil>"), err)
i64, err = m.ToInt64()
assert.Equal(t, int64(0), i64)
assert.Equal(t, errors.New("<nil>"), err)
b, err = m.ToBool()
assert.Equal(t, false, b)
assert.Equal(t, errors.New("<nil>"), err)
}