FixtureTestSuite
Related Doc:
package scalatest
The type of the fixture parameter that can be passed into tests in this suite.
The type of the fixture parameter that can be passed into tests in this suite.
A test function taking no arguments and returning an Outcome.
A test function taking no arguments and returning an Outcome.
For more detail and examples, see the relevant section in the
documentation for trait fixture.FlatSpec.
A test function taking a fixture parameter and returning an Outcome.
A test function taking a fixture parameter and returning an Outcome.
For more detail and examples, see the
documentation for trait fixture.FlatSpec.
Run the passed test function with a fixture created by this method.
Run the passed test function with a fixture created by this method.
This method should create the fixture object needed by the tests of the current suite, invoke the test function (passing in the fixture object), and if needed, perform any clean up needed after the test completes. For more detail and examples, see the main documentation for this trait.
the OneArgTest to invoke, passing in a fixture
an instance of Outcome
Companion object for OneArgTest that provides factory method to create new OneArgTest
instance by passing in a OneArgTest and a FixtureParam => Outcome function.
Companion object for OneArgTest that provides factory method to create new OneArgTest
instance by passing in a OneArgTest and a FixtureParam => Outcome function.
Assert that a boolean condition, described in String
message, is true.
Assert that a boolean condition, described in String
message, is true.
If the condition is true, this method returns normally.
Else, it throws TestFailedException with a helpful error message
appended with the String obtained by invoking toString on the
specified clue as the exception's detail message.
This method is implemented in terms of a Scala macro that will generate a more helpful error message for expressions of this form:
At this time, any other form of expression will just get a TestFailedException with message saying the given
expression was false. In the future, we will enhance this macro to give helpful error messages in more situations.
In ScalaTest 2.0, however, this behavior was sufficient to allow the === that returns Boolean
to be the default in tests. This makes === consistent between tests and production
code.
the boolean condition to assert
An objects whose toString method returns a message to include in a failure report.
NullArgumentException if message is null.
TestFailedException if the condition is false.
Assert that a boolean condition is true.
Assert that a boolean condition is true.
If the condition is true, this method returns normally.
Else, it throws TestFailedException.
This method is implemented in terms of a Scala macro that will generate a more helpful error message for expressions of this form:
At this time, any other form of expression will get a TestFailedException with message saying the given
expression was false. In the future, we will enhance this macro to give helpful error messages in more situations.
In ScalaTest 2.0, however, this behavior was sufficient to allow the === that returns Boolean
to be the default in tests. This makes === consistent between tests and production
code.
the boolean condition to assert
TestFailedException if the condition is false.
Asserts that a given string snippet of code passes both the Scala parser and type checker.
Asserts that a given string snippet of code passes both the Scala parser and type checker.
You can use this to make sure a snippet of code compiles:
assertCompiles("val a: Int = 1")
Although assertCompiles is implemented with a macro that determines at compile time whether
the snippet of code represented by the passed string compiles, errors (i.e.,
snippets of code that do not compile) are reported as test failures at runtime.
the snippet of code that should compile
Asserts that a given string snippet of code does not pass either the Scala parser or type checker.
Asserts that a given string snippet of code does not pass either the Scala parser or type checker.
Often when creating libraries you may wish to ensure that certain arrangements of code that
represent potential “user errors” do not compile, so that your library is more error resistant.
ScalaTest's Assertions trait includes the following syntax for that purpose:
assertDoesNotCompile("val a: String = \"a string")
Although assertDoesNotCompile is implemented with a macro that determines at compile time whether
the snippet of code represented by the passed string doesn't compile, errors (i.e.,
snippets of code that do compile) are reported as test failures at runtime.
Note that the difference between assertTypeError and assertDoesNotCompile is
that assertDoesNotCompile will succeed if the given code does not compile for any reason,
whereas assertTypeError will only succeed if the given code does not compile because of
a type error. If the given code does not compile because of a syntax error, for example, assertDoesNotCompile
will return normally but assertTypeError will throw a TestFailedException.
the snippet of code that should not type check
Assert that the value passed as expected equals the value passed as actual.
Assert that the value passed as expected equals the value passed as actual.
If the actual value equals the expected value
(as determined by ==), assertResult returns
normally. Else, assertResult throws a
TestFailedException whose detail message includes the expected and actual values.
the expected value
the actual value, which should equal the passed expected value
TestFailedException if the passed actual value does not equal the passed expected value.
Assert that the value passed as expected equals the value passed as actual.
Assert that the value passed as expected equals the value passed as actual.
If the actual equals the expected
(as determined by ==), assertResult returns
normally. Else, if actual is not equal to expected, assertResult throws a
TestFailedException whose detail message includes the expected and actual values, as well as the String
obtained by invoking toString on the passed clue.
the expected value
An object whose toString method returns a message to include in a failure report.
the actual value, which should equal the passed expected value
TestFailedException if the passed actual value does not equal the passed expected value.
Ensure that an expected exception is thrown by the passed function value.
Ensure that an expected exception is thrown by the passed function value. The thrown exception must be an instance of the
type specified by the type parameter of this method. This method invokes the passed
function. If the function throws an exception that's an instance of the specified type,
this method returns Succeeded. Else, whether the passed function returns normally
or completes abruptly with a different exception, this method throws TestFailedException.
Note that the type specified as this method's type parameter may represent any subtype of
AnyRef, not just Throwable or one of its subclasses. In
Scala, exceptions can be caught based on traits they implement, so it may at times make sense
to specify a trait that the intercepted exception's class must mix in. If a class instance is
passed for a type that could not possibly be used to catch an exception (such as String,
for example), this method will complete abruptly with a TestFailedException.
Also note that the difference between this method and intercept is that this method
does not return the expected exception, so it does not let you perform further assertions on
that exception. Instead, this method returns Succeeded, which means it can
serve as the last statement in an async- or safe-style suite. It also indicates to the reader
of the code that nothing further is expected about the thrown exception other than its type.
The recommended usage is to use assertThrows by default, intercept only when you
need to inspect the caught exception further.
the function value that should throw the expected exception
an implicit ClassTag representing the type of the specified
type parameter.
the Succeeded singleton, if an exception of the expected type is thrown
TestFailedException if the passed function does not complete abruptly with an exception
that's an instance of the specified type.
Asserts that a given string snippet of code does not pass the Scala type checker, failing if the given snippet does not pass the Scala parser.
Asserts that a given string snippet of code does not pass the Scala type checker, failing if the given snippet does not pass the Scala parser.
Often when creating libraries you may wish to ensure that certain arrangements of code that
represent potential “user errors” do not compile, so that your library is more error resistant.
ScalaTest's Assertions trait includes the following syntax for that purpose:
assertTypeError("val a: String = 1")
Although assertTypeError is implemented with a macro that determines at compile time whether
the snippet of code represented by the passed string type checks, errors (i.e.,
snippets of code that do type check) are reported as test failures at runtime.
Note that the difference between assertTypeError and assertDoesNotCompile is
that assertDoesNotCompile will succeed if the given code does not compile for any reason,
whereas assertTypeError will only succeed if the given code does not compile because of
a type error. If the given code does not compile because of a syntax error, for example, assertDoesNotCompile
will return normally but assertTypeError will throw a TestFailedException.
the snippet of code that should not type check
Assume that a boolean condition, described in String
message, is true.
Assume that a boolean condition, described in String
message, is true.
If the condition is true, this method returns normally.
Else, it throws TestCanceledException with a helpful error message
appended with String obtained by invoking toString on the
specified clue as the exception's detail message.
This method is implemented in terms of a Scala macro that will generate a more helpful error message for expressions of this form:
At this time, any other form of expression will just get a TestCanceledException with message saying the given
expression was false. In the future, we will enhance this macro to give helpful error messages in more situations.
In ScalaTest 2.0, however, this behavior was sufficient to allow the === that returns Boolean
to be the default in tests. This makes === consistent between tests and production
code.
the boolean condition to assume
An objects whose toString method returns a message to include in a failure report.
NullArgumentException if message is null.
TestCanceledException if the condition is false.
Assume that a boolean condition is true.
Assume that a boolean condition is true.
If the condition is true, this method returns normally.
Else, it throws TestCanceledException.
This method is implemented in terms of a Scala macro that will generate a more helpful error message for expressions of this form:
At this time, any other form of expression will just get a TestCanceledException with message saying the given
expression was false. In the future, we will enhance this macro to give helpful error messages in more situations.
In ScalaTest 2.0, however, this behavior was sufficient to allow the === that returns Boolean
to be the default in tests. This makes === consistent between tests and production
code.
the boolean condition to assume
TestCanceledException if the condition is false.
Throws TestCanceledException, with the passed
Throwable cause, to indicate a test failed.
Throws TestCanceledException, with the passed
Throwable cause, to indicate a test failed.
The getMessage method of the thrown TestCanceledException
will return cause.toString.
a Throwable that indicates the cause of the cancellation.
NullArgumentException if cause is null
Throws TestCanceledException, with the passed
String message as the exception's detail
message and Throwable cause, to indicate a test failed.
Throws TestCanceledException, with the passed
String message as the exception's detail
message and Throwable cause, to indicate a test failed.
A message describing the failure.
A Throwable that indicates the cause of the failure.
NullArgumentException if message or cause is null
Throws TestCanceledException, with the passed
String message as the exception's detail
message, to indicate a test was canceled.
Throws TestCanceledException, with the passed
String message as the exception's detail
message, to indicate a test was canceled.
A message describing the cancellation.
NullArgumentException if message is null
Throws TestCanceledException to indicate a test was canceled.
Throws TestCanceledException to indicate a test was canceled.
The total number of tests that are expected to run when this Suite's run method is invoked.
The total number of tests that are expected to run when this Suite's run method is invoked.
This trait's implementation of this method returns the sum of:
testNames List, minus the number of tests marked as ignored and
any tests that are exluded by the passed FilterexpectedTestCount on every nested Suite contained in
nestedSuitesa Filter with which to filter tests to count based on their tags
Throws TestFailedException, with the passed
Throwable cause, to indicate a test failed.
Throws TestFailedException, with the passed
Throwable cause, to indicate a test failed.
The getMessage method of the thrown TestFailedException
will return cause.toString.
a Throwable that indicates the cause of the failure.
NullArgumentException if cause is null
Throws TestFailedException, with the passed
String message as the exception's detail
message and Throwable cause, to indicate a test failed.
Throws TestFailedException, with the passed
String message as the exception's detail
message and Throwable cause, to indicate a test failed.
A message describing the failure.
A Throwable that indicates the cause of the failure.
NullArgumentException if message or cause is null
Throws TestFailedException, with the passed
String message as the exception's detail
message, to indicate a test failed.
Throws TestFailedException, with the passed
String message as the exception's detail
message, to indicate a test failed.
A message describing the failure.
NullArgumentException if message is null
Throws TestFailedException to indicate a test failed.
Throws TestFailedException to indicate a test failed.
Intercept and return an exception that's expected to be thrown by the passed function value.
Intercept and return an exception that's expected to
be thrown by the passed function value. The thrown exception must be an instance of the
type specified by the type parameter of this method. This method invokes the passed
function. If the function throws an exception that's an instance of the specified type,
this method returns that exception. Else, whether the passed function returns normally
or completes abruptly with a different exception, this method throws TestFailedException.
Note that the type specified as this method's type parameter may represent any subtype of
AnyRef, not just Throwable or one of its subclasses. In
Scala, exceptions can be caught based on traits they implement, so it may at times make sense
to specify a trait that the intercepted exception's class must mix in. If a class instance is
passed for a type that could not possibly be used to catch an exception (such as String,
for example), this method will complete abruptly with a TestFailedException.
Also note that the difference between this method and assertThrows is that this method
returns the expected exception, so it lets you perform further assertions on
that exception. By contrast, the assertThrows method returns Succeeded, which means it can
serve as the last statement in an async- or safe-style suite. assertThrows also indicates to the reader
of the code that nothing further is expected about the thrown exception other than its type.
The recommended usage is to use assertThrows by default, intercept only when you
need to inspect the caught exception further.
the function value that should throw the expected exception
an implicit ClassTag representing the type of the specified
type parameter.
the intercepted exception, if it is of the expected type
TestFailedException if the passed function does not complete abruptly with an exception
that's an instance of the specified type.
An immutable IndexedSeq of this Suite object's nested Suites.
An immutable IndexedSeq of this Suite object's nested Suites. If this Suite contains no nested Suites,
this method returns an empty IndexedSeq. This trait's implementation of this method returns an empty List.
Throws TestPendingException to indicate a test is pending.
Throws TestPendingException to indicate a test is pending.
A pending test is one that has been given a name but is not yet implemented. The purpose of pending tests is to facilitate a style of testing in which documentation of behavior is sketched out before tests are written to verify that behavior (and often, the before the behavior of the system being tested is itself implemented). Such sketches form a kind of specification of what tests and functionality to implement later.
To support this style of testing, a test can be given a name that specifies one
bit of behavior required by the system being tested. The test can also include some code that
sends more information about the behavior to the reporter when the tests run. At the end of the test,
it can call method pending, which will cause it to complete abruptly with TestPendingException.
Because tests in ScalaTest can be designated as pending with TestPendingException, both the test name and any information
sent to the reporter when running the test can appear in the report of a test run. (In other words,
the code of a pending test is executed just like any other test.) However, because the test completes abruptly
with TestPendingException, the test will be reported as pending, to indicate
the actual test, and possibly the functionality it is intended to test, has not yet been implemented.
Note: This method always completes abruptly with a TestPendingException. Thus it always has a side
effect. Methods with side effects are usually invoked with parentheses, as in pending(). This
method is defined as a parameterless method, in flagrant contradiction to recommended Scala style, because it
forms a kind of DSL for pending tests. It enables tests in suites such as FunSuite or FunSpec
to be denoted by placing "(pending)" after the test name, as in:
test("that style rules are not laws") (pending)
Readers of the code see "pending" in parentheses, which looks like a little note attached to the test name to indicate
it is pending. Whereas "(pending()) looks more like a method call, "(pending)" lets readers
stay at a higher level, forgetting how it is implemented and just focusing on the intent of the programmer who wrote the code.
Execute the passed block of code, and if it completes abruptly, throw TestPendingException, else
throw TestFailedException.
Execute the passed block of code, and if it completes abruptly, throw TestPendingException, else
throw TestFailedException.
This method can be used to temporarily change a failing test into a pending test in such a way that it will
automatically turn back into a failing test once the problem originally causing the test to fail has been fixed.
At that point, you need only remove the pendingUntilFixed call. In other words, a
pendingUntilFixed surrounding a block of code that isn't broken is treated as a test failure.
The motivation for this behavior is to encourage people to remove pendingUntilFixed calls when
there are no longer needed.
This method facilitates a style of testing in which tests are written before the code they test. Sometimes you may
encounter a test failure that requires more functionality than you want to tackle without writing more tests. In this
case you can mark the bit of test code causing the failure with pendingUntilFixed. You can then write more
tests and functionality that eventually will get your production code to a point where the original test won't fail anymore.
At this point the code block marked with pendingUntilFixed will no longer throw an exception (because the
problem has been fixed). This will in turn cause pendingUntilFixed to throw TestFailedException
with a detail message explaining you need to go back and remove the pendingUntilFixed call as the problem orginally
causing your test code to fail has been fixed.
a block of code, which if it completes abruptly, should trigger a TestPendingException
TestPendingException if the passed block of code completes abruptly with an Exception or AssertionError
The fully qualified class name of the rerunner to rerun this suite.
The fully qualified class name of the rerunner to rerun this suite. This implementation will look at this.getClass and see if it is either an accessible Suite, or it has a WrapWith annotation. If so, it returns the fully qualified class name wrapped in a Some, or else it returns None.
Runs this suite of tests.
Runs this suite of tests.
If testName is None, this trait's implementation of this method
calls these two methods on this object in this order:
runNestedSuitesrunTestsIf testName is defined, then this trait's implementation of this method
calls runTests, but does not call runNestedSuites. This behavior
is part of the contract of this method. Subclasses that override run must take
care not to call runNestedSuites if testName is defined. (The
OneInstancePerTest trait depends on this behavior, for example.)
Subclasses and subtraits that override this run method can implement them without
invoking either the runTests or runNestedSuites methods, which
are invoked by this trait's implementation of this method. It is recommended, but not required,
that subclasses and subtraits that override run in a way that does not
invoke runNestedSuites also override runNestedSuites and make it
final. Similarly it is recommended, but not required,
that subclasses and subtraits that override run in a way that does not
invoke runTests also override runTests (and runTest,
which this trait's implementation of runTests calls) and make it
final. The implementation of these final methods can either invoke the superclass implementation
of the method, or throw an UnsupportedOperationException if appropriate. The
reason for this recommendation is that ScalaTest includes several traits that override
these methods to allow behavior to be mixed into a Suite. For example, trait
BeforeAndAfterEach overrides runTestss. In a Suite
subclass that no longer invokes runTests from run, the
BeforeAndAfterEach trait is not applicable. Mixing it in would have no effect.
By making runTests final in such a Suite subtrait, you make
the attempt to mix BeforeAndAfterEach into a subclass of your subtrait
a compiler error. (It would fail to compile with a complaint that BeforeAndAfterEach
is trying to override runTests, which is a final method in your trait.)
an optional name of one test to run. If None, all relevant tests should be run.
I.e., None acts like a wildcard that means run all relevant tests in this Suite.
the Args for this run
a Status object that indicates when all tests and nested suites started by this method have completed, and whether or not a failure occurred.
IllegalArgumentException if testName is defined, but no test with the specified test name
exists in this Suite
NullArgumentException if any passed parameter is null.
Run zero to many of this Suite's nested Suites.
Run zero to many of this Suite's nested Suites.
If the passed distributor is None, this trait's
implementation of this method invokes run on each
nested Suite in the List obtained by invoking nestedSuites.
If a nested Suite's run
method completes abruptly with an exception, this trait's implementation of this
method reports that the Suite aborted and attempts to run the
next nested Suite.
If the passed distributor is defined, this trait's implementation
puts each nested Suite
into the Distributor contained in the Some, in the order in which the
Suites appear in the List returned by nestedSuites, passing
in a new Tracker obtained by invoking nextTracker on the Tracker
passed to this method.
Implementations of this method are responsible for ensuring SuiteStarting events
are fired to the Reporter before executing any nested Suite, and either SuiteCompleted
or SuiteAborted after executing any nested Suite.
the Args for this run
a Status object that indicates when all nested suites started by this method have completed, and whether or not a failure occurred.
NullArgumentException if any passed parameter is null.
Run an async test.
Run an async test.
This method is redefine in this trait solely to narrow its contract. Subclasses must implement
this method to call the withFixture(NoArgTest) method, which is defined in this trait.
This trait's implementation of this method simply returns SucceededStatus
and has no other effect.
the name of one async test to execute.
the Args for this run
a Status object that indicates when the test started by this method
has completed, and whether or not it failed.
Run zero to many of this Suite's tests.
Run zero to many of this Suite's tests.
This method takes a testName parameter that optionally specifies a test to invoke.
If testName is defined, this trait's implementation of this method
invokes runTest on this object, passing in:
testName - the String value of the testName Option passed
to this methodreporter - the Reporter passed to this method, or one that wraps and delegates to itstopper - the Stopper passed to this method, or one that wraps and delegates to itconfigMap - the configMap Map passed to this method, or one that wraps and delegates to itThis method takes a Filter, which encapsulates an optional Set of tag names that should be included
(tagsToInclude) and a Set that should be excluded (tagsToExclude), when deciding which
of this Suite's tests to run.
If tagsToInclude is None, all tests will be run
except those those belonging to tags listed in the tagsToExclude Set. If tagsToInclude is defined, only tests
belonging to tags mentioned in the tagsToInclude Set, and not mentioned in the tagsToExcludeSet
will be run. However, if testName is defined, tagsToInclude and tagsToExclude are essentially ignored.
Only if testName is None will tagsToInclude and tagsToExclude be consulted to
determine which of the tests named in the testNames Set should be run. This trait's implementation
behaves this way, and it is part of the general contract of this method, so all overridden forms of this method should behave
this way as well. For more information on test tags, see the main documentation for this trait and for class Filter.
Note that this means that even if a test is marked as ignored, for example a test method in a Suite annotated with
org.scalatest.Ignore, if that test name is passed as testName to runTest, it will be invoked
despite the Ignore annotation.
If testName is None, this trait's implementation of this method
invokes testNames on this Suite to get a Set of names of tests to potentially run.
(A testNames value of None essentially acts as a wildcard that means all tests in
this Suite that are selected by tagsToInclude and tagsToExclude should be run.)
For each test in the testName Set, in the order
they appear in the iterator obtained by invoking the elements method on the Set, this trait's implementation
of this method checks whether the test should be run based on the Filter.
If so, this implementation invokes runTest, passing in:
testName - the String name of the test to run (which will be one of the names in the testNames Set)reporter - the Reporter passed to this method, or one that wraps and delegates to itstopper - the Stopper passed to this method, or one that wraps and delegates to itconfigMap - the configMap passed to this method, or one that wraps and delegates to itIf a test is marked with the org.scalatest.Ignore tag, implementations
of this method are responsible for ensuring a TestIgnored event is fired for that test
and that runTest is not called for that test.
an optional name of one test to run. If None, all relevant tests should be run.
I.e., None acts like a wildcard that means run all relevant tests in this Suite.
the Args for this run
a Status object that indicates when all tests started by this method have completed, and whether or not a failure occurred.
IllegalArgumentException if testName is defined, but no test with the specified test name
exists in this Suite
NullArgumentException if any of the passed parameters is null.
The Succeeded singleton.
The Succeeded singleton.
You can use succeed to solve a type error when an async test
does not end in either Future[Assertion] or Assertion.
Because Assertion is a type alias for Succeeded.type,
putting succeed at the end of a test body (or at the end of a
function being used to map the final future of a test body) will solve
the type error.
A string ID for this Suite that is intended to be unique among all suites reported during a run.
A string ID for this Suite that is intended to be unique among all suites reported during a run.
This trait's
implementation of this method returns the fully qualified name of this object's class.
Each suite reported during a run will commonly be an instance of a different Suite class,
and in such cases, this default implementation of this method will suffice. However, in special cases
you may need to override this method to ensure it is unique for each reported suite. For example, if you write
a Suite subclass that reads in a file whose name is passed to its constructor and dynamically
creates a suite of tests based on the information in that file, you will likely need to override this method
in your Suite subclass, perhaps by appending the pathname of the file to the fully qualified class name.
That way if you run a suite of tests based on a directory full of these files, you'll have unique suite IDs for
each reported suite.
The suite ID is intended to be unique, because ScalaTest does not enforce that it is unique. If it is not unique, then you may not be able to uniquely identify a particular test of a particular suite. This ability is used, for example, to dynamically tag tests as having failed in the previous run when rerunning only failed tests.
this Suite object's ID.
A user-friendly suite name for this Suite.
A user-friendly suite name for this Suite.
This trait's
implementation of this method returns the simple name of this object's class. This
trait's implementation of runNestedSuites calls this method to obtain a
name for Reports to pass to the suiteStarting, suiteCompleted,
and suiteAborted methods of the Reporter.
this Suite object's suite name.
A Map whose keys are String names of tests that are tagged and
whose associated values are the Set of tag names for the test.
A Map whose keys are String names of tests that are tagged and
whose associated values are the Set of tag names for the test. If a test has no associated tags, its name
does not appear as a key in the returned Map. If this Suite contains no tests with tags, this
method returns an empty Map.
This trait's implementation of this method uses Java reflection to discover any Java annotations attached to its test methods. The
fully qualified name of each unique annotation that extends TagAnnotation is considered a tag. This trait's
implementation of this method, therefore, places one key/value pair into to the
Map for each test for which a tag annotation is discovered through reflection.
In addition to test methods annotations, this trait's implementation will also auto-tag test methods with class level annotations. For example, if you annotate @Ignore at the class level, all test methods in the class will be auto-annotated with @Ignore.
Subclasses may override this method to define and/or discover tags in a custom manner, but overriding method implementations
should never return an empty Set as a value. If a test has no tags, its name should not appear as a key in the
returned Map.
Provides a TestData instance for the passed test name, given the passed config map.
Provides a TestData instance for the passed test name, given the passed config map.
This method is used to obtain a TestData instance to pass to withFixture(NoArgTest)
and withFixture(OneArgTest) and the beforeEach and afterEach methods
of trait BeforeAndAfterEach.
the name of the test for which to return a TestData instance
the config map to include in the returned TestData
a TestData instance for the specified test, which includes the specified config map
A Set of test names.
A Set of test names. If this Suite contains no tests, this method returns an empty Set.
This trait's implementation of this method returns an empty Set.
Executes the block of code passed as the second parameter, and, if it
completes abruptly with a ModifiableMessage exception,
prepends the "clue" string passed as the first parameter to the beginning of the detail message
of that thrown exception, then rethrows it.
Executes the block of code passed as the second parameter, and, if it
completes abruptly with a ModifiableMessage exception,
prepends the "clue" string passed as the first parameter to the beginning of the detail message
of that thrown exception, then rethrows it. If clue does not end in a white space
character, one space will be added
between it and the existing detail message (unless the detail message is
not defined).
This method allows you to add more information about what went wrong that will be reported when a test fails. Here's an example:
withClue("(Employee's name was: " + employee.name + ")") {
intercept[IllegalArgumentException] {
employee.getTask(-1)
}
}
If an invocation of intercept completed abruptly with an exception, the resulting message would be something like:
(Employee's name was Bob Jones) Expected IllegalArgumentException to be thrown, but no exception was thrown
NullArgumentException if the passed clue is null
Run the passed test function in the context of a fixture established by this method.
Run the passed test function in the context of a fixture established by this method.
This method should set up the fixture needed by the tests of the
current suite, invoke the test function, and if needed, perform any clean
up needed after the test completes. Because the NoArgTest function
passed to this method takes no parameters, preparing the fixture will require
side effects, such as reassigning instance vars in this Suite or initializing
a globally accessible external database. If you want to avoid reassigning instance vars
you can use FixtureSuite.
This trait's implementation of runTest invokes this method for each test, passing
in a NoArgTest whose apply method will execute the code of the test.
This trait's implementation of this method simply invokes the passed NoArgTest function.
the no-arg test function to run with a fixture
(Since version 3.1.0) The conversionCheckedConstraint method has been deprecated and will be removed in a future version of ScalaTest. It is no longer needed now that the deprecation period of ConversionCheckedTripleEquals has expired. It will not be replaced.
(Since version 3.1.0) The convertEquivalenceToAToBConversionConstraint method has been deprecated and will be removed in a future version of ScalaTest. It is no longer needed now that the deprecation period of ConversionCheckedTripleEquals has expired. It will not be replaced.
(Since version 3.1.0) The convertEquivalenceToBToAConversionConstraint method has been deprecated and will be removed in a future version of ScalaTest. It is no longer needed now that the deprecation period of ConversionCheckedTripleEquals has expired. It will not be replaced.
(Since version 3.1.0) The lowPriorityConversionCheckedConstraint method has been deprecated and will be removed in a future version of ScalaTest. It is no longer needed now that the deprecation period of ConversionCheckedTripleEquals has expired. It will not be replaced.
The styleName lifecycle method has been deprecated and will be removed in a future version of ScalaTest.
The styleName lifecycle method has been deprecated and will be removed in a future version of ScalaTest.
This method was used to support the chosen styles feature, which was deactivated in 3.1.0. The internal modularization of ScalaTest in 3.2.0
will replace chosen styles as the tool to encourage consistency across a project. We do not plan a replacement for styleName.
(Since version 3.1.0) The styleName lifecycle method has been deprecated and will be removed in a future version of ScalaTest with no replacement.
The base trait for ScalaTest's synchronous testing styles that accept a fixture object passed into tests. This trait defines a
withFixturelifecycle method that takes as its parameter a test function that accepts a fixture object and returns anOutcome.The abstract
withFixturemethod add by this trait has the following signature:The
applymethod of test function interface,OneArgTest, also returnsOutcome:Because the result of a test is an
Outcome, when the test function returns, the test body must have determined an outcome already. It will already be one ofSucceeded,Failed,Canceled, or Pending. This is also true whenwithFixture(OneArgTest)returns: because the result type ofwithFixture(OneArgTest)isOutcome, the test has by definition already finished execution.The recommended way to ensure cleanup is performed after a test body finishes execution is to use a
try-finallyclause. Usingtry-finallywill ensure that cleanup will occur whether the test function completes abruptly by throwing a suite-aborting exception, or returns normally yielding anOutcome. Note that the only situation in which a test function will complete abruptly with an exception is if the test body throws a suite-aborting exception. Any other exception will be caught and reported as either aFailed,Canceled, orPending.To enable the stacking of traits that define
withFixture(NoArgTest), it is a good idea to letwithFixture(NoArgTest)invoke the test function instead of invoking the test function directly. To do so, you'll need to convert theOneArgTestto aNoArgTest. You can do that by passing the fixture object to thetoNoArgTestmethod ofOneArgTest. In other words, instead of writing “test(theFixture)”, you'd delegate responsibility for invoking the test function to thewithFixture(NoArgTest)method of the same instance by writing:The
withFixturemethod is designed to be stacked, and to enable this, you should always call thesuperimplementation ofwithFixture, and let it invoke the test function rather than invoking the test function directly. In other words, instead of writing “test(...)”, you should write “super.withFixture(test)”. Thus, the recommended structure of awithFixtureimplementation that performs cleanup looks like this:// Your implementation type FixtureParam = String override def withFixture(test: OneArgTest) = { // Perform setup here val theFixture = "hello" try { withFixture(test.toNoArgTest(theFixture)) // Invoke the test function } finally { // Perform cleanup here } }If you have no cleanup to perform, you can write
withFixturelike this instead:// Your implementation type FixtureParam = String override def withFixture(test: NoArgTest) = { // Perform setup here val theFixture = "hello" withFixture(test.toNoArgTest(theFixture)) // Invoke the test function }If you want to perform an action only for certain outcomes, you can use a pattern match. For example, if you want to perform an action if a test fails, you'd match on
Failed, like this:// Your implementation type FixtureParam = String override def withFixture(test: NoArgTest) = { // Perform setup here val theFixture = "hello" val outcome = withFixture(test.toNoArgTest(theFixture)) // Invoke the test function outcome match { case failed: Failed => // perform action that you want to occur // only if a test fails here failed case other => other } }If you want to change the outcome in some way in
withFixture, you can also use a pattern match. For example, if a particular exception intermittently causes a test to fail, and can transform those failures into cancelations, like this:// Your implementation type FixtureParam = String override def withFixture(test: NoArgTest) = { val theFixture = "hello" withFixture(test.toNoArgTest(theFixture)) match { case Failed(ex: ParticularException) => Canceled("Muting flicker", ex) case other => other } }