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result_test.go
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result_test.go
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package mo
import (
"testing"
"github.com/stretchr/testify/assert"
)
func TestResultOk(t *testing.T) {
is := assert.New(t)
is.Equal(Result[int]{value: 42, isErr: false, err: nil}, Ok(42))
}
func TestResultErr(t *testing.T) {
is := assert.New(t)
is.Equal(Result[int]{value: 0, isErr: true, err: assert.AnError}, Err[int](assert.AnError))
}
func TestResultIsOk(t *testing.T) {
is := assert.New(t)
is.True(Ok(42).IsOk())
is.False(Err[int](assert.AnError).IsOk())
}
func TestResultIsError(t *testing.T) {
is := assert.New(t)
is.False(Ok(42).IsError())
is.True(Err[int](assert.AnError).IsError())
}
func TestResultError(t *testing.T) {
is := assert.New(t)
is.Nil(Ok(42).Error())
is.NotNil(Err[int](assert.AnError).Error())
is.Equal(assert.AnError, Err[int](assert.AnError).Error())
}
func TestResultGet(t *testing.T) {
is := assert.New(t)
v1, err1 := Ok(42).Get()
v2, err2 := Err[int](assert.AnError).Get()
is.Equal(42, v1)
is.Nil(err1)
is.Error(assert.AnError, err1)
is.Equal(0, v2)
is.NotNil(err2)
is.Error(assert.AnError, err2)
}
func TestResultMustGet(t *testing.T) {
is := assert.New(t)
is.NotPanics(func() {
Ok(42).MustGet()
})
is.Panics(func() {
Err[int](assert.AnError).MustGet()
})
is.Equal(42, Ok(42).MustGet())
}
func TestResultOrElse(t *testing.T) {
is := assert.New(t)
is.Equal(42, Ok(42).OrElse(21))
is.Equal(21, Err[int](assert.AnError).OrElse(21))
}
func TestResultOrEmpty(t *testing.T) {
is := assert.New(t)
is.Equal(42, Ok(42).OrEmpty())
is.Equal(0, Err[int](assert.AnError).OrEmpty())
}
func TestResultToEither(t *testing.T) {
is := assert.New(t)
right, ok1 := Ok(42).ToEither().Right()
left, ok2 := Err[int](assert.AnError).ToEither().Left()
is.Equal(42, right)
is.True(ok1)
is.Equal(assert.AnError, left)
is.True(ok2)
}
func TestResultForEach(t *testing.T) {
is := assert.New(t)
Err[int](assert.AnError).ForEach(func(i int) {
is.Fail("should not enter here")
})
Ok(42).ForEach(func(i int) {
is.Equal(42, i)
})
}
func TestResultMatch(t *testing.T) {
is := assert.New(t)
opt1 := Ok(21).Match(
func(i int) (int, error) {
is.Equal(21, i)
return i * 2, nil
},
func(err error) (int, error) {
is.Fail("should not enter here")
return 0, err
},
)
opt2 := Err[int](assert.AnError).Match(
func(i int) (int, error) {
is.Fail("should not enter here")
return i * 2, nil
},
func(err error) (int, error) {
is.Equal(assert.AnError, err)
return 0, err
},
)
is.Equal(Result[int]{value: 42, isErr: false, err: nil}, opt1)
is.Equal(Result[int]{value: 0, isErr: true, err: assert.AnError}, opt2)
}
func TestResultMap(t *testing.T) {
is := assert.New(t)
opt1 := Ok(21).Map(func(i int) (int, error) {
return i * 2, nil
})
opt2 := Err[int](assert.AnError).Map(func(i int) (int, error) {
is.Fail("should not be called")
return 42, nil
})
is.Equal(Result[int]{value: 42, isErr: false, err: nil}, opt1)
is.Equal(Result[int]{value: 0, isErr: true, err: assert.AnError}, opt2)
}
func TestResultMapErr(t *testing.T) {
is := assert.New(t)
opt1 := Ok(21).MapErr(func(err error) (int, error) {
is.Fail("should not be called")
return 42, nil
})
opt2 := Err[int](assert.AnError).MapErr(func(err error) (int, error) {
return 42, nil
})
is.Equal(Result[int]{value: 21, isErr: false, err: nil}, opt1)
is.Equal(Result[int]{value: 42, isErr: false, err: nil}, opt2)
}
func TestResultFlatMap(t *testing.T) {
is := assert.New(t)
opt1 := Ok(21).FlatMap(func(i int) Result[int] {
return Ok(42)
})
opt2 := Err[int](assert.AnError).FlatMap(func(i int) Result[int] {
is.Fail("should not be called")
return Ok(42)
})
is.Equal(Result[int]{value: 42, isErr: false, err: nil}, opt1)
is.Equal(Result[int]{value: 0, isErr: true, err: assert.AnError}, opt2)
}