A library of assertion functions.
If the assertion is false an AssertionError
will be thrown which will
result in pretty-printed diff of the failing assertion.
Any constructor
An array-like object (Array
, Uint8Array
, NodeList
, etc.) that is not a string
Make an assertion, error will be thrown if expr
does not have truthy value.
Make an assertion that actual
and expected
are almost equal numbers
through a given tolerance. It can be used to take into account IEEE-754
double-precision floating-point representation limitations. If the values
are not almost equal then throw.
Make an assertion that actual
includes the expected
values. If not then
an error will be thrown.
Make an assertion that actual
and expected
are equal, deeply. If not
deeply equal, then throw.
Make an assertion that actual is not null or undefined. If not then throw.
Make an assertion, error will be thrown if expr
have truthy value.
Make an assertion that actual
is greater than expected
.
If not then throw.
Make an assertion that actual
is greater than or equal to expected
.
If not then throw.
Make an assertion that obj
is an instance of type
.
If not then throw.
Error thrown when an assertion fails.
Make an assertion that error
is an Error
.
If not then an error will be thrown.
An error class and a string that should be included in the
error message can also be asserted.
Make an assertion that actual
is less than expected
.
If not then throw.
Make an assertion that actual
is less than or equal to expected
.
If not then throw.
Make an assertion that actual
match RegExp expected
. If not
then throw.
Make an assertion that actual
and expected
are not equal, deeply.
If not then throw.
Make an assertion that obj
is not an instance of type
.
If so, then throw.
Make an assertion that actual
not match RegExp expected
. If match
then throw.
Make an assertion that actual
and expected
are not strictly equal, using
Object.is
for equality comparison. If the values are strictly
equal then throw.
Make an assertion that expected
object is a subset of actual
object,
deeply. If not, then throw a diff of the objects, with mismatching
properties highlighted.
Executes a function which returns a promise, expecting it to reject.
Make an assertion that actual
and expected
are strictly equal, using
Object.is
for equality comparison. If not, then throw.
Make an assertion that actual includes expected. If not then throw.
Executes a function, expecting it to throw. If it does not, then it throws.
Deep equality comparison used in assertions.
Forcefully throws a failed assertion.
Assertion condition for assertFalse
.
Gets constructor type
Use this to stub out methods that will throw when invoked.
Use this to assert unreachable code.
Make an assertion that actual
and expected
are almost equal numbers
through a given tolerance. It can be used to take into account IEEE-754
double-precision floating-point representation limitations. If the values
are not almost equal then throw.
An array-like object (Array
, Uint8Array
, NodeList
, etc.) that is not a string
Make an assertion that actual
includes the expected
values. If not then
an error will be thrown.
Make an assertion, error will be thrown if expr
does not have truthy value.
Error thrown when an assertion fails.
Deep equality comparison used in assertions.
Make an assertion that actual
and expected
are equal, deeply. If not
deeply equal, then throw.
Make an assertion that actual is not null or undefined. If not then throw.
Forcefully throws a failed assertion.
Make an assertion, error will be thrown if expr
have truthy value.
Assertion condition for assertFalse
.
Make an assertion that actual
is greater than expected
.
If not then throw.
Make an assertion that actual
is greater than or equal to expected
.
If not then throw.
Any constructor
Make an assertion that obj
is an instance of type
.
If not then throw.
Gets constructor type
Make an assertion that error
is an Error
.
If not then an error will be thrown.
An error class and a string that should be included in the
error message can also be asserted.
Make an assertion that actual
is less than expected
.
If not then throw.
Make an assertion that actual
is less than or equal to expected
.
If not then throw.
Make an assertion that actual
match RegExp expected
. If not
then throw.
Make an assertion that actual
and expected
are not equal, deeply.
If not then throw.
Make an assertion that obj
is not an instance of type
.
If so, then throw.
Make an assertion that actual
not match RegExp expected
. If match
then throw.
Make an assertion that actual
and expected
are not strictly equal, using
Object.is
for equality comparison. If the values are strictly
equal then throw.
Make an assertion that expected
object is a subset of actual
object,
deeply. If not, then throw a diff of the objects, with mismatching
properties highlighted.
Executes a function which returns a promise, expecting it to reject.
Make an assertion that actual
and expected
are strictly equal, using
Object.is
for equality comparison. If not, then throw.
Make an assertion that actual includes expected. If not then throw.
Executes a function, expecting it to throw. If it does not, then it throws.
Use this to stub out methods that will throw when invoked.
Use this to assert unreachable code.
Make an assertion that x
is of type never
.
If not then throw.