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package lo
import (
"testing"
"github.com/stretchr/testify/assert"
)
func TestIsNil(t *testing.T) {
t.Parallel()
is := assert.New(t)
var x int
is.False(IsNil(x))
var k struct{}
is.False(IsNil(k))
var s *string
is.True(IsNil(s))
var i *int
is.True(IsNil(i))
var b *bool
is.True(IsNil(b))
var ifaceWithNilValue any = (*string)(nil) //nolint:staticcheck
is.True(IsNil(ifaceWithNilValue))
is.False(ifaceWithNilValue == nil) //nolint:staticcheck,testifylint
}
func TestIsNotNil(t *testing.T) {
t.Parallel()
is := assert.New(t)
var x int
is.True(IsNotNil(x))
var k struct{}
is.True(IsNotNil(k))
var s *string
is.False(IsNotNil(s))
var i *int
is.False(IsNotNil(i))
var b *bool
is.False(IsNotNil(b))
var ifaceWithNilValue any = (*string)(nil) //nolint:staticcheck
is.False(IsNotNil(ifaceWithNilValue))
is.True(ifaceWithNilValue != nil) //nolint:staticcheck,testifylint
}
func TestToPtr(t *testing.T) {
t.Parallel()
is := assert.New(t)
result1 := ToPtr([]int{1, 2})
is.Equal([]int{1, 2}, *result1)
}
func TestNil(t *testing.T) {
t.Parallel()
is := assert.New(t)
nilFloat64 := Nil[float64]()
var expNilFloat64 *float64
nilString := Nil[string]()
var expNilString *string
is.Equal(expNilFloat64, nilFloat64)
is.Nil(nilFloat64)
is.NotEqual(nil, nilFloat64) //nolint:testifylint
is.Equal(expNilString, nilString)
is.Nil(nilString)
is.NotEqual(nil, nilString) //nolint:testifylint
is.NotEqual(nilString, nilFloat64)
}
func TestEmptyableToPtr(t *testing.T) {
t.Parallel()
is := assert.New(t)
is.Nil(EmptyableToPtr(0))
is.Nil(EmptyableToPtr(""))
is.Nil(EmptyableToPtr[[]int](nil))
is.Nil(EmptyableToPtr[map[int]int](nil))
is.Nil(EmptyableToPtr[error](nil))
is.Equal(42, *EmptyableToPtr(42))
is.Equal("nonempty", *EmptyableToPtr("nonempty"))
is.Empty(*EmptyableToPtr([]int{}))
is.Equal([]int{1, 2}, *EmptyableToPtr([]int{1, 2}))
is.Empty(*EmptyableToPtr(map[int]int{}))
is.Equal(assert.AnError, *EmptyableToPtr(assert.AnError))
}
func TestFromPtr(t *testing.T) {
t.Parallel()
is := assert.New(t)
str1 := "foo"
ptr := &str1
is.Equal("foo", FromPtr(ptr))
is.Empty(FromPtr[string](nil))
is.Zero(FromPtr[int](nil))
is.Nil(FromPtr[*string](nil))
is.Equal(ptr, FromPtr(&ptr))
}
func TestFromPtrOr(t *testing.T) {
t.Parallel()
is := assert.New(t)
const fallbackStr = "fallback"
str := "foo"
ptrStr := &str
const fallbackInt = -1
i := 9
ptrInt := &i
is.Equal(str, FromPtrOr(ptrStr, fallbackStr))
is.Equal(fallbackStr, FromPtrOr(nil, fallbackStr))
is.Equal(i, FromPtrOr(ptrInt, fallbackInt))
is.Equal(fallbackInt, FromPtrOr(nil, fallbackInt))
}
func TestToSlicePtr(t *testing.T) {
t.Parallel()
is := assert.New(t)
str1 := "foo"
str2 := "bar"
result1 := ToSlicePtr([]string{str1, str2})
is.Equal([]*string{&str1, &str2}, result1)
}
func TestFromSlicePtr(t *testing.T) {
t.Parallel()
is := assert.New(t)
str1 := "foo"
str2 := "bar"
result1 := FromSlicePtr([]*string{&str1, &str2, nil})
is.Equal([]string{str1, str2, ""}, result1)
}
func TestFromSlicePtrOr(t *testing.T) {
t.Parallel()
is := assert.New(t)
str1 := "foo"
str2 := "bar"
result1 := FromSlicePtrOr([]*string{&str1, &str2, nil}, "fallback")
is.Equal([]string{str1, str2, "fallback"}, result1)
}
func TestToAnySlice(t *testing.T) {
t.Parallel()
is := assert.New(t)
in1 := []int{0, 1, 2, 3}
in2 := []int{}
out1 := ToAnySlice(in1)
out2 := ToAnySlice(in2)
is.Equal([]any{0, 1, 2, 3}, out1)
is.Empty(out2)
}
func TestFromAnySlice(t *testing.T) {
t.Parallel()
is := assert.New(t)
is.NotPanics(func() {
out1, ok1 := FromAnySlice[string]([]any{"foobar", 42})
out2, ok2 := FromAnySlice[string]([]any{"foobar", "42"})
is.Empty(out1)
is.False(ok1)
is.Equal([]string{"foobar", "42"}, out2)
is.True(ok2)
})
}
func TestEmpty(t *testing.T) {
t.Parallel()
is := assert.New(t)
type test struct{}
is.Empty(Empty[string]())
is.Empty(Empty[int64]())
is.Empty(Empty[test]())
is.Empty(Empty[chan string]())
is.Nil(Empty[[]int]())
is.Nil(Empty[map[string]int]())
}
func TestIsEmpty(t *testing.T) {
t.Parallel()
is := assert.New(t)
type test struct {
foobar string
}
is.True(IsEmpty(""))
is.False(IsEmpty("foo"))
is.True(IsEmpty[int64](0))
is.False(IsEmpty[int64](42))
is.True(IsEmpty(test{foobar: ""}))
is.False(IsEmpty(test{foobar: "foo"}))
}
func TestIsNotEmpty(t *testing.T) {
t.Parallel()
is := assert.New(t)
type test struct {
foobar string
}
is.False(IsNotEmpty(""))
is.True(IsNotEmpty("foo"))
is.False(IsNotEmpty[int64](0))
is.True(IsNotEmpty[int64](42))
is.False(IsNotEmpty(test{foobar: ""}))
is.True(IsNotEmpty(test{foobar: "foo"}))
}
func TestCoalesce(t *testing.T) {
t.Parallel()
is := assert.New(t)
newStr := func(v string) *string { return &v }
var nilStr *string
str1 := newStr("str1")
str2 := newStr("str2")
type structType struct {
field1 int
field2 float64
}
var zeroStruct structType
struct1 := structType{1, 1.0}
struct2 := structType{2, 2.0}
result1, ok1 := Coalesce[int]()
result2, ok2 := Coalesce(3)
result3, ok3 := Coalesce(nil, nilStr)
result4, ok4 := Coalesce(nilStr, str1)
result5, ok5 := Coalesce(nilStr, str1, str2)
result6, ok6 := Coalesce(str1, str2, nilStr)
result7, ok7 := Coalesce(0, 1, 2, 3)
result8, ok8 := Coalesce(zeroStruct)
result9, ok9 := Coalesce(zeroStruct, struct1)
result10, ok10 := Coalesce(zeroStruct, struct1, struct2)
is.Zero(result1)
is.False(ok1)
is.Equal(3, result2)
is.True(ok2)
is.Nil(result3)
is.False(ok3)
is.Equal(str1, result4)
is.True(ok4)
is.Equal(str1, result5)
is.True(ok5)
is.Equal(str1, result6)
is.True(ok6)
is.Equal(1, result7)
is.True(ok7)
is.Zero(result8)
is.False(ok8)
is.Equal(struct1, result9)
is.True(ok9)
is.Equal(struct1, result10)
is.True(ok10)
}
func TestCoalesceOrEmpty(t *testing.T) {
t.Parallel()
is := assert.New(t)
newStr := func(v string) *string { return &v }
var nilStr *string
str1 := newStr("str1")
str2 := newStr("str2")
type structType struct {
field1 int
field2 float64
}
var zeroStruct structType
struct1 := structType{1, 1.0}
struct2 := structType{2, 2.0}
result1 := CoalesceOrEmpty[int]()
result2 := CoalesceOrEmpty(3)
result3 := CoalesceOrEmpty(nil, nilStr)
result4 := CoalesceOrEmpty(nilStr, str1)
result5 := CoalesceOrEmpty(nilStr, str1, str2)
result6 := CoalesceOrEmpty(str1, str2, nilStr)
result7 := CoalesceOrEmpty(0, 1, 2, 3)
result8 := CoalesceOrEmpty(zeroStruct)
result9 := CoalesceOrEmpty(zeroStruct, struct1)
result10 := CoalesceOrEmpty(zeroStruct, struct1, struct2)
is.Zero(result1)
is.Equal(3, result2)
is.Nil(result3)
is.Equal(str1, result4)
is.Equal(str1, result5)
is.Equal(str1, result6)
is.Equal(1, result7)
is.Zero(result8)
is.Equal(struct1, result9)
is.Equal(struct1, result10)
}
func TestCoalesceSlice(t *testing.T) {
t.Parallel()
is := assert.New(t)
var sliceNil []int
slice0 := []int{}
slice1 := []int{1}
slice2 := []int{1, 2}
result1, ok1 := CoalesceSlice[int]()
result2, ok2 := CoalesceSlice[int](nil)
result3, ok3 := CoalesceSlice(sliceNil)
result4, ok4 := CoalesceSlice(slice0)
result5, ok5 := CoalesceSlice(nil, sliceNil, slice0)
result6, ok6 := CoalesceSlice(slice2)
result7, ok7 := CoalesceSlice(slice1)
result8, ok8 := CoalesceSlice(slice1, slice2)
result9, ok9 := CoalesceSlice(slice2, slice1)
result10, ok10 := CoalesceSlice(sliceNil, slice0, slice1, slice2)
is.NotNil(result1)
is.Empty(result1)
is.False(ok1)
is.NotNil(result2)
is.Empty(result2)
is.False(ok2)
is.NotNil(result3)
is.Empty(result3)
is.False(ok3)
is.NotNil(result4)
is.Empty(result4)
is.False(ok4)
is.NotNil(result5)
is.Empty(result5)
is.False(ok5)
is.NotNil(result6)
is.Equal(slice2, result6)
is.True(ok6)
is.NotNil(result7)
is.Equal(slice1, result7)
is.True(ok7)
is.NotNil(result8)
is.Equal(slice1, result8)
is.True(ok8)
is.NotNil(result9)
is.Equal(slice2, result9)
is.True(ok9)
is.NotNil(result10)
is.Equal(slice1, result10)
is.True(ok10)
}
func TestCoalesceSliceOrEmpty(t *testing.T) {
t.Parallel()
is := assert.New(t)
var sliceNil []int
slice0 := []int{}
slice1 := []int{1}
slice2 := []int{1, 2}
result1 := CoalesceSliceOrEmpty[int]()
result2 := CoalesceSliceOrEmpty[int](nil)
result3 := CoalesceSliceOrEmpty(sliceNil)
result4 := CoalesceSliceOrEmpty(slice0)
result5 := CoalesceSliceOrEmpty(nil, sliceNil, slice0)
result6 := CoalesceSliceOrEmpty(slice2)
result7 := CoalesceSliceOrEmpty(slice1)
result8 := CoalesceSliceOrEmpty(slice1, slice2)
result9 := CoalesceSliceOrEmpty(slice2, slice1)
result10 := CoalesceSliceOrEmpty(sliceNil, slice0, slice1, slice2)
is.NotNil(result1)
is.Empty(result1)
is.NotNil(result2)
is.Empty(result2)
is.NotNil(result3)
is.Empty(result3)
is.NotNil(result4)
is.Empty(result4)
is.NotNil(result5)
is.Empty(result5)
is.NotNil(result6)
is.Equal(slice2, result6)
is.NotNil(result7)
is.Equal(slice1, result7)
is.NotNil(result8)
is.Equal(slice1, result8)
is.NotNil(result9)
is.Equal(slice2, result9)
is.NotNil(result10)
is.Equal(slice1, result10)
}
func TestCoalesceMap(t *testing.T) {
t.Parallel()
is := assert.New(t)
var mapNil map[int]int
map0 := map[int]int{}
map1 := map[int]int{1: 1}
map2 := map[int]int{1: 1, 2: 2}
result1, ok1 := CoalesceMap[int, int]()
result2, ok2 := CoalesceMap[int, int](nil)
result3, ok3 := CoalesceMap(mapNil)
result4, ok4 := CoalesceMap(map0)
result5, ok5 := CoalesceMap(nil, mapNil, map0)
result6, ok6 := CoalesceMap(map2)
result7, ok7 := CoalesceMap(map1)
result8, ok8 := CoalesceMap(map1, map2)
result9, ok9 := CoalesceMap(map2, map1)
result10, ok10 := CoalesceMap(mapNil, map0, map1, map2)
is.NotNil(result1)
is.Empty(result1)
is.False(ok1)
is.NotNil(result2)
is.Empty(result2)
is.False(ok2)
is.NotNil(result3)
is.Empty(result3)
is.False(ok3)
is.NotNil(result4)
is.Empty(result4)
is.False(ok4)
is.NotNil(result5)
is.Empty(result5)
is.False(ok5)
is.NotNil(result6)
is.Equal(map2, result6)
is.True(ok6)
is.NotNil(result7)
is.Equal(map1, result7)
is.True(ok7)
is.NotNil(result8)
is.Equal(map1, result8)
is.True(ok8)
is.NotNil(result9)
is.Equal(map2, result9)
is.True(ok9)
is.NotNil(result10)
is.Equal(map1, result10)
is.True(ok10)
}
func TestCoalesceMapOrEmpty(t *testing.T) {
t.Parallel()
is := assert.New(t)
var mapNil map[int]int
map0 := map[int]int{}
map1 := map[int]int{1: 1}
map2 := map[int]int{1: 1, 2: 2}
result1 := CoalesceMapOrEmpty[int, int]()
result2 := CoalesceMapOrEmpty[int, int](nil)
result3 := CoalesceMapOrEmpty(mapNil)
result4 := CoalesceMapOrEmpty(map0)
result5 := CoalesceMapOrEmpty(nil, mapNil, map0)
result6 := CoalesceMapOrEmpty(map2)
result7 := CoalesceMapOrEmpty(map1)
result8 := CoalesceMapOrEmpty(map1, map2)
result9 := CoalesceMapOrEmpty(map2, map1)
result10 := CoalesceMapOrEmpty(mapNil, map0, map1, map2)
is.NotNil(result1)
is.Empty(result1)
is.NotNil(result2)
is.Empty(result2)
is.NotNil(result3)
is.Empty(result3)
is.NotNil(result4)
is.Empty(result4)
is.NotNil(result5)
is.Empty(result5)
is.NotNil(result6)
is.Equal(map2, result6)
is.NotNil(result7)
is.Equal(map1, result7)
is.NotNil(result8)
is.Equal(map1, result8)
is.NotNil(result9)
is.Equal(map2, result9)
is.NotNil(result10)
is.Equal(map1, result10)
}