org.scalatest.matchers.ShouldMatchers
This method enables the following syntax:
This method enables the following syntax:
Array(1, 2) should (contain (2) and contain (1))
This method is used to compare the receiver object (this
)
with the argument object (arg0
) for equivalence
This method is used to compare the receiver object (this
)
with the argument object (arg0
) for equivalence.
The default implementations of this method is an equivalence relation:
x
of type Any
,
x.equals(x)
should return true
.x
and y
of type
Any
, x.equals(y)
should return true
if and only
if y.equals(x)
returns true
.x
, y
, and z
of type AnyRef
if x.equals(y)
returns true
and
y.equals(z)
returns
true
, then x.equals(z)
should return true
.
If you override this method, you should verify that
your implementation remains an equivalence relation.
Additionally, when overriding this method it is often necessary to
override hashCode
to ensure that objects that are
"equal" (o1.equals(o2)
returns true
)
hash to the same Int
(o1.hashCode.equals(o2.hashCode)
).
the object to compare against this object for equality.
true
if the receiver object is equivalent to the argument; false
otherwise.
Returns a hash code value for the object
Returns a hash code value for the object.
The default hashing algorithm is platform dependent.
Note that it is allowed for two objects to have identical hash
codes (o1.hashCode.equals(o2.hashCode)
) yet not be
equal (o1.equals(o2)
returns false
). A
degenerate implementation could always return 0
.
However, it is required that if two objects are equal
(o1.equals(o2)
returns true
) that they
have identical hash codes
(o1.hashCode.equals(o2.hashCode)
). Therefore, when
overriding this method, be sure to verify that the behavior is
consistent with the equals
method.
This method enables the following syntax:
This method enables the following syntax:
map should (contain key ("fifty five") or contain key ("twenty two"))
The map's value type parameter cannot be inferred because only a key type is provided in
an expression like (contain key ("fifty five"))
. The matcher returned
by this method matches scala.collection.Map
s with the inferred key type and value type Any
. Given
Map
is covariant in its value type, and Matcher
is contravariant in
its type parameter, a Matcher[Map[Int, Any]]
, for example, is a subtype of Matcher[Map[Int, String]]
.
This will enable the matcher returned by this method to be used against any Map
that has
the inferred key type.
Returns a string representation of the object
Returns a string representation of the object.
The default representation is platform dependent.
This method enables the following syntax:
This method enables the following syntax:
Map("one" -> 1, "two" -> 2) should (not contain value (5) and not contain value (3))
The map's key type parameter cannot be inferred because only a value type is provided in
an expression like (contain value (5))
. The matcher returned
by this method matches scala.collection.Map
s with the inferred value type and the existential key
type [K] forSome { type K }
. Even though Matcher
is contravariant in its type parameter, because
Map
is nonvariant in its key type,
a Matcher[Map[Any, Int]]
, for example, is not a subtype of Matcher[Map[String, Int]]
,
so the key type parameter of the Map
returned by this method cannot be Any
. By making it
an existential type, the Scala compiler will not infer it to anything more specific.
This will enable the matcher returned by this method to be used against any Map
that has
the inferred value type.
This class is part of the ScalaTest matchers DSL. Please see the documentation for
ShouldMatchers
orMustMatchers
for an overview of the matchers DSL.