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<?php
declare
(strict_types=
1
);
namespace
Fp4
\
PHP
\
Test
;
use
Fp4
\
PHP
\
Bindable
;
use
Fp4
\
PHP
\
Option
as
O
;
use
Fp4
\
PHP
\
PHPUnit
as
Assert
;
use
Fp4
\
PHP
\
PsalmIntegration
as
Type
;
use
PHPUnit
\
Framework
\
Attributes
\
Test
;
use
PHPUnit
\
Framework
\
TestCase
;
use
RuntimeException
;
use
stdClass
;
use
function
Fp4
\
PHP
\
Combinator
\
pipe
;
/**
* @api
* @see Bindable
*/
final
class
OptionTest
extends
TestCase
{
// region: constructor
#[Test]
public
static
function
some
():
void
{
pipe
(
O
\some
(
42
),
Type
\isSameAs
(
'
O\Option<int>
'
),
O
\getOrNull
(...),
Assert
\equals
(
42
),
);
}
#[Test]
public
static
function
none
():
void
{
pipe
(
O
\none,
Type
\isSameAs
(
'
O\Option<never>
'
),
O
\getOrNull
(...),
Assert
\equals
(
null
),
);
}
#[Test]
public
static
function
fromNullable
():
void
{
pipe
(
O
\fromNullable
(
42
),
Type
\isSameAs
(
'
O\Option<int>
'
),
Assert
\equals
(
O
\some
(
42
)),
);
pipe
(
O
\fromNullable
(
null
),
Type
\isSameAs
(
'
O\Option<never>
'
),
Assert
\equals
(
O
\none),
);
}
#[Test]
public
static
function
tryCatch
():
void
{
pipe
(
O
\tryCatch
(
fn
() =>
throw
new
RuntimeException
()),
Type
\isSameAs
(
'
O\Option<never>
'
),
O
\getOrNull
(...),
Assert
\equals
(
null
),
);
pipe
(
O
\tryCatch
(
fn
() =>
42
),
Type
\isSameAs
(
'
O\Option<int>
'
),
O
\getOrNull
(...),
Assert
\equals
(
42
),
);
}
#[Test]
public
static
function
first
():
void
{
pipe
(
O
\first
(
fn
() =>
O
\none,
),
Type
\isSameAs
(
'
O\Option<never>
'
),
Assert
\equals
(
O
\none),
);
pipe
(
O
\first
(
fn
() =>
O
\none,
fn
() =>
O
\some
(
42
),
fn
() =>
O
\some
(
'
str
'
),
),
Type
\isSameAs
(
'
O\Option<int|string>
'
),
Assert
\equals
(
O
\some
(
42
)),
);
pipe
(
O
\first
(
fn
() =>
O
\none,
fn
() =>
O
\none,
fn
() =>
O
\some
(
42
),
),
Type
\isSameAs
(
'
O\Option<int>
'
),
Assert
\equals
(
O
\some
(
42
)),
);
}
// endregion: constructor
// region: destructors
#[Test]
public
static
function
getOrNull
():
void
{
pipe
(
O
\some
(
42
),
O
\getOrNull
(...),
Type
\isSameAs
(
'
int|null
'
),
Assert
\equals
(
42
),
);
pipe
(
O
\none,
O
\getOrNull
(...),
Type
\isSameAs
(
'
null
'
),
Assert
\equals
(
null
),
);
}
#[Test]
public
static
function
getOrElse
():
void
{
pipe
(
O
\some
(
42
),
O
\getOrElse
(
0
),
Type
\isSameAs
(
'
int
'
),
Assert
\equals
(
42
),
);
pipe
(
O
\none,
O
\getOrElse
(
42
),
Type
\isSameAs
(
'
42
'
),
Assert
\equals
(
42
),
);
}
#[Test]
public
static
function
getOrCall
():
void
{
pipe
(
O
\some
(
42
),
O
\getOrCall
(
fn
() =>
0
),
Type
\isSameAs
(
'
int
'
),
Assert
\equals
(
42
),
);
pipe
(
O
\none,
O
\getOrCall
(
fn
() =>
42
),
Type
\isSameAs
(
'
42
'
),
Assert
\equals
(
42
),
);
}
// endregion: destructors
// region: refinements
#[Test]
public
static
function
isSome
():
void
{
pipe
(
O
\none,
O
\isSome
(...),
Type
\isSameAs
(
'
bool
'
),
Assert
\equals
(
false
),
);
pipe
(
O
\some
(
42
),
O
\isSome
(...),
Type
\isSameAs
(
'
bool
'
),
Assert
\equals
(
true
),
);
}
#[Test]
public
static
function
isNone
():
void
{
pipe
(
O
\some
(
42
),
O
\isNone
(...),
Type
\isSameAs
(
'
bool
'
),
Assert
\equals
(
false
),
);
pipe
(
O
\none,
O
\isNone
(...),
Type
\isSameAs
(
'
bool
'
),
Assert
\equals
(
true
),
);
}
// endregion: refinements
// region: ops
#[Test]
public
static
function
map
():
void
{
pipe
(
O
\some
(
0
),
O
\map
(
fn
(
$
i
) =>
$
i
+
42
),
Type
\isSameAs
(
'
O\Option<int>
'
),
Assert
\equals
(
O
\some
(
42
)),
);
pipe
(
O
\none,
O
\map
(
fn
(
$
i
) =>
$
i
),
Type
\isSameAs
(
'
O\Option<never>
'
),
Assert
\equals
(
O
\none),
);
}
#[Test]
public
static
function
tap
():
void
{
$
expected
=
new
stdClass
();
$
expected
->
value
=
42
;
$
actual
=
new
stdClass
();
pipe
(
$
expected
,
Assert
\equals
(
$
expected
));
pipe
(
O
\some
(
$
actual
),
O
\tap
(
fn
(
stdClass
$
obj
):
int
=>
$
obj
->
value
=
42
),
Type
\isSameAs
(
'
O\Option<stdClass>
'
),
Assert
\instance
(
O
\Some::class),
);
pipe
(
$
expected
,
Assert
\equals
(
$
actual
));
pipe
(
O
\none,
O
\tap
(
fn
(
$
obj
) =>
print_r
(
$
obj
)),
Type
\isSameAs
(
'
O\Option<never>
'
),
Assert
\instance
(
O
\None::class),
);
}
#[Test]
public
static
function
flatMap
():
void
{
pipe
(
O
\some
(
0
),
O
\flatMap
(
fn
(
$
i
) =>
0
===
$
i
?
O
\some
(
$
i
+
42
) :
O
\none),
Type
\isSameAs
(
'
O\Option<int>
'
),
Assert
\equals
(
O
\some
(
42
)),
);
pipe
(
O
\some
(
0
),
O
\flatMap
(
fn
(
$
i
) =>
0
!==
$
i
?
O
\some
(
$
i
+
42
) :
O
\none),
Type
\isSameAs
(
'
O\Option<int>
'
),
Assert
\equals
(
O
\none),
);
}
#[Test]
public
static
function
flatMapNullable
():
void
{
pipe
(
O
\none,
O
\flatMapNullable
(
fn
(
$
i
) =>
$
i
),
Type
\isSameAs
(
'
O\Option<never>
'
),
Assert
\equals
(
O
\none),
);
pipe
(
O
\some
(
0
),
O
\flatMapNullable
(
fn
(
$
i
) =>
1
!==
$
i
?
$
i
+
42
:
null
),
Type
\isSameAs
(
'
O\Option<int>
'
),
Assert
\equals
(
O
\some
(
42
)),
);
pipe
(
O
\some
(
0
),
O
\flatMapNullable
(
fn
(
$
i
) =>
0
!==
$
i
?
$
i
+
42
:
null
),
Type
\isSameAs
(
'
O\Option<int>
'
),
Assert
\equals
(
O
\none),
);
}
#[Test]
public
static
function
flatten
():
void
{
pipe
(
O
\none,
O
\flatten
(...),
Assert
\equals
(
O
\none),
);
pipe
(
O
\some
(
O
\none),
O
\flatten
(...),
Assert
\equals
(
O
\none),
);
pipe
(
O
\some
(
O
\some
(
42
)),
O
\flatten
(...),
Type
\isSameAs
(
'
O\Option<int>
'
),
Assert
\equals
(
O
\some
(
42
)),
);
}
#[Test]
public
static
function
ap
():
void
{
pipe
(
O
\none,
O
\ap
(
O
\some
(
42
)),
Assert
\equals
(
O
\none),
);
pipe
(
O
\some
(
fn
(
int
$
a
) =>
$
a
+
1
),
O
\ap
(
O
\none),
Assert
\equals
(
O
\none),
);
pipe
(
O
\none,
O
\ap
(
O
\none),
Assert
\equals
(
O
\none),
);
pipe
(
O
\some
(
fn
(
int
$
a
) =>
$
a
+
1
),
O
\ap
(
O
\some
(
41
)),
Assert
\equals
(
O
\some
(
42
)),
);
}
#[Test]
public
static
function
orElse
():
void
{
pipe
(
O
\some
(
42
),
O
\orElse
(
fn
() =>
O
\some
(
0
)),
Type
\isSameAs
(
'
O\Option<int>
'
),
Assert
\equals
(
O
\some
(
42
)),
);
pipe
(
O
\none,
O
\orElse
(
fn
() =>
O
\some
(
42
)),
Type
\isSameAs
(
'
O\Option<int>
'
),
Assert
\equals
(
O
\some
(
42
)),
);
pipe
(
O
\none,
O
\orElse
(
fn
() =>
O
\none),
Type
\isSameAs
(
'
O\Option<never>
'
),
Assert
\equals
(
O
\none),
);
}
#[Test]
public
static
function
filter
(
int
|
string
$
stringOrInt
=
42
):
void
{
pipe
(
O
\some
(
$
stringOrInt
),
O
\filter
(
is_int
(...)),
Type
\isSameAs
(
'
O\Option<int>
'
),
Assert
\equals
(
O
\some
(
42
)),
);
pipe
(
O
\some
(
42
),
O
\filter
(
fn
(
$
i
) =>
$
i
>=
0
&&
$
i
<=
100
),
Type
\isSameAs
(
'
O\Option<int<0, 100>>
'
),
Assert
\equals
(
O
\some
(
42
)),
);
pipe
(
O
\none,
O
\filter
(
fn
(
$
i
) =>
$
i
>=
42
),
Type
\isSameAs
(
'
O\Option<never>
'
),
Assert
\equals
(
O
\none),
);
pipe
(
O
\some
(
42
),
O
\filter
(
fn
(
$
i
) =>
$
i
>
42
),
Type
\isSameAs
(
'
O\Option<int<43, max>>
'
),
Assert
\equals
(
O
\none),
);
}
#[Test]
public
static
function
filterOf
():
void
{
pipe
(
O
\some
(
42
),
O
\filterOf
(stdClass::class),
Type
\isSameAs
(
'
O\Option<stdClass>
'
),
Assert
\equals
(
O
\none),
);
pipe
(
O
\some
(
new
stdClass
()),
O
\filterOf
(stdClass::class),
Type
\isSameAs
(
'
O\Option<stdClass>
'
),
Assert
\equals
(
O
\some
(
new
stdClass
())),
);
}
// endregion: ops
// region: bindable
#[Test]
public
static
function
bind
():
void
{
pipe
(
O
\bindable
(),
O
\bind
(
a:
fn
() =>
O
\some
(
31
),
b:
fn
() =>
O
\none,
),
Type
\isSameAs
(
'
O\Option<Bindable<object{a: int, b: never}>>
'
),
Assert
\equals
(
O
\none),
);
pipe
(
O
\bindable
(),
O
\bind
(
a:
fn
() =>
O
\some
(
31
),
b:
fn
() =>
O
\none,
),
O
\bind
(c:
fn
() =>
O
\some
(
32
)),
Type
\isSameAs
(
'
O\Option<Bindable<object{a: int, b: never, c: int}>>
'
),
Assert
\equals
(
O
\none),
);
pipe
(
O
\bindable
(),
O
\bind
(
a:
fn
() =>
O
\some
(
31
),
b:
fn
() =>
O
\some
(
11
),
),
Type
\isSameAs
(
'
O\Option<Bindable<object{a: int, b: int}>>
'
),
O
\map
(
fn
(
$
i
) =>
$
i
->
a
+
$
i
->
b
),
Type
\isSameAs
(
'
O\Option<int>
'
),
Assert
\equals
(
O
\some
(
42
)),
);
pipe
(
O
\bindable
(),
O
\bind
(
a:
fn
() =>
O
\some
(
30
),
b:
fn
() =>
O
\some
(
10
),
c:
fn
(
$
i
) =>
O
\some
(
$
i
->
a
+
$
i
->
b
+
2
),
),
Type
\isSameAs
(
'
O\Option<Bindable<object{a: int, b: int, c: int}>>
'
),
O
\map
(
fn
(
$
i
) =>
$
i
->
c
),
Type
\isSameAs
(
'
O\Option<int>
'
),
Assert
\equals
(
O
\some
(
42
)),
);
}
#[Test]
public
static
function
let
():
void
{
pipe
(
O
\bindable
(),
O
\bind
(
a:
fn
() =>
O
\some
(
31
),
b:
fn
() =>
O
\none,
),
O
\let
(c:
fn
() =>
42
),
Type
\isAssignableTo
(
'
O\Option<Bindable<object{a: int, b: never, c: int}>>
'
),
Assert
\equals
(
O
\none),
);
pipe
(
O
\bindable
(),
O
\let
(
a:
fn
() =>
31
,
b:
fn
() =>
11
,
),
Type
\isAssignableTo
(
'
O\Option<Bindable<object{a: int, b: int}>>
'
),
O
\map
(
fn
(
$
i
) =>
$
i
->
a
+
$
i
->
b
),
Type
\isAssignableTo
(
'
O\Option<int>
'
),
Assert
\equals
(
O
\some
(
42
)),
);
pipe
(
O
\bindable
(),
O
\let
(
a:
fn
() =>
30
,
b:
fn
() =>
10
,
c:
fn
(
$
i
) =>
$
i
->
a
+
$
i
->
b
+
2
,
),
Type
\isAssignableTo
(
'
O\Option<Bindable<object{a: int, b: int, c: int}>>
'
),
O
\map
(
fn
(
$
i
) =>
$
i
->
c
),
Type
\isAssignableTo
(
'
O\Option<int>
'
),
Assert
\equals
(
O
\some
(
42
)),
);
}
// endregion: bindable
}
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