FreeSpec

Assert that an Option[String] is None. If the condition is None, this method returns normally. Else, it throws TestFailedException with the String value of the Some included in the TestFailedException's detail message.

This form of assert is usually called in conjunction with an implicit conversion to Equalizer, using a === comparison, as in:

assert(a === b)

For more information on how this mechanism works, see the documentation for Equalizer.

Assert that an Option[String] is None. If the condition is None, this method returns normally. Else, it throws TestFailedException with the String value of the Some, as well as the String obtained by invoking toString on the specified message, included in the TestFailedException's detail message.

This form of assert is usually called in conjunction with an implicit conversion to Equalizer, using a === comparison, as in:

assert(a === b, "extra info reported if assertion fails")

For more information on how this mechanism works, see the documentation for Equalizer.

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 the String obtained by invoking toString on the specified message as the exception's detail message.

Assert that a boolean condition is true. If the condition is true, this method returns normally. Else, it throws TestFailedException.

Supports shared test registration in path.FreeSpecs.

This field enables syntax such as the following:

behave like nonFullStack(stackWithOneItem)
^

For more information and examples of the use of <cod>behave, see the Shared tests section in the main documentation for sister trait org.scalatest.FreeSpec.

Implicit conversion from Any to Equalizer, used to enable assertions with === comparisons.

For more information on this mechanism, see the documentation for Equalizer.

Because trait Suite mixes in Assertions, this implicit conversion will always be available by default in ScalaTest Suites. This is the only implicit conversion that is in scope by default in every ScalaTest Suite. Other implicit conversions offered by ScalaTest, such as those that support the matchers DSL or invokePrivate, must be explicitly invited into your test code, either by mixing in a trait or importing the members of its companion object. The reason ScalaTest requires you to invite in implicit conversions (with the exception of the implicit conversion for === operator) is because if one of ScalaTest's implicit conversions clashes with an implicit conversion used in the code you are trying to test, your program won't compile. Thus there is a chance that if you are ever trying to use a library or test some code that also offers an implicit conversion involving a === operator, you could run into the problem of a compiler error due to an ambiguous implicit conversion. If that happens, you can turn off the implicit conversion offered by this convertToEqualizer method simply by overriding the method in your Suite subclass, but not marking it as implicit:

// In your Suite subclass
override def convertToEqualizer(left: Any) = new Equalizer(left)

Implicitly converts Strings to FreeSpecStringWrapper, which enables methods in, is, taggedAs and ignore, as well as the dash operator (-), to be invoked on Strings.

Executes one or more tests in this Suite, printing results to the standard output.

This method invokes run on itself, passing in values that can be configured via the parameters to this method, all of which have default values. This behavior is convenient when working with ScalaTest in the Scala interpreter. Here's a summary of this method's parameters and how you can use them:

The testName parameter

If you leave testName at its default value (of null), this method will pass None to the testName parameter of run, and as a result all the tests in this suite will be executed. If you specify a testName, this method will pass Some(testName) to run, and only that test will be run. Thus to run all tests in a suite from the Scala interpreter, you can write:

scala> (new ExampleSuite).execute()

To run just the test named "my favorite test" in a suite from the Scala interpreter, you would write:

scala> (new ExampleSuite).execute("my favorite test")

Or:

scala> (new ExampleSuite).execute(testName = "my favorite test")

The configMap parameter

If you provide a value for the configMap parameter, this method will pass it to run. If not, the default value of an empty Map will be passed. For more information on how to use a config map to configure your test suites, see the config map section in the main documentation for this trait. Here's an example in which you configure a run with the name of an input file:

scala> (new ExampleSuite).execute(configMap = Map("inputFileName" -> "in.txt")

The color parameter

If you leave the color parameter unspecified, this method will configure the reporter it passes to run to print to the standard output in color (via ansi escape characters). If you don't want color output, specify false for color, like this:

scala> (new ExampleSuite).execute(color = false)

The durations parameter

If you leave the durations parameter unspecified, this method will configure the reporter it passes to run to not print durations for tests and suites to the standard output. If you want durations printed, specify true for durations, like this:

scala> (new ExampleSuite).execute(durations = true)

The shortstacks and fullstacks parameters

If you leave both the shortstacks and fullstacks parameters unspecified, this method will configure the reporter it passes to run to not print stack traces for failed tests if it has a stack depth that identifies the offending line of test code. If you prefer a short stack trace (10 to 15 stack frames) to be printed with any test failure, specify true for shortstacks:

scala> (new ExampleSuite).execute(shortstacks = true)

For full stack traces, set fullstacks to true:

scala> (new ExampleSuite).execute(fullstacks = true)

If you specify true for both shortstacks and fullstacks, you'll get full stack traces.

The stats parameter

If you leave the stats parameter unspecified, this method will not fire RunStarting and either RunCompleted or RunAborted events to the reporter it passes to run. If you specify true for stats, this method will fire the run events to the reporter, and the reporter will print the expected test count before the run, and various statistics after, including the number of suites completed and number of tests that succeeded, failed, were ignored or marked pending. Here's how you get the stats:

scala> (new ExampleSuite).execute(stats = true)

To summarize, this method will pass to run:

• testName - None if this method's testName parameter is left at its default value of null, else Some(testName).
• reporter - a reporter that prints to the standard output
• stopper - a Stopper whose apply method always returns false
• filter - a Filter constructed with None for tagsToInclude and Set() for tagsToExclude
• configMap - the configMap passed to this method
• distributor - None
• tracker - a new Tracker

Note: In ScalaTest, the terms "execute" and "run" basically mean the same thing and can be used interchangably. The reason this method isn't named run is that it takes advantage of default arguments, and you can't mix overloaded methods and default arguments in Scala. (If named run, this method would have the same name but different arguments than the main run method that takes seven arguments. Thus it would overload and couldn't be used with default argument values.)

Design note: This method has two "features" that may seem unidiomatic. First, the default value of testName is null. Normally in Scala the type of testName would be Option[String] and the default value would be None, as it is in this trait's run method. The null value is used here for two reasons. First, in ScalaTest 1.5, execute was changed from four overloaded methods to one method with default values, taking advantage of the default and named parameters feature introduced in Scala 2.8. To not break existing source code, testName needed to have type String, as it did in two of the overloaded execute methods prior to 1.5. The other reason is that execute has always been designed to be called primarily from an interpeter environment, such as the Scala REPL (Read-Evaluate-Print-Loop). In an interpreter environment, minimizing keystrokes is king. A String type with a null default value lets users type suite.execute("my test name") rather than suite.execute(Some("my test name")), saving several keystrokes.

The second non-idiomatic feature is that shortstacks and fullstacks are all lower case rather than camel case. This is done to be consistent with the Shell, which also uses those forms. The reason lower case is used in the Shell is to save keystrokes in an interpreter environment. Most Unix commands, for example, are all lower case, making them easier and quicker to type. In the ScalaTest Shell, methods like shortstacks, fullstacks, and nostats, etc., are designed to be all lower case so they feel more like shell commands than methods.

Expect that the value passed as expected equals the value passed as actual. If the actual value equals the expected value (as determined by ==), expectResult returns normally. Else, expect throws a TestFailedException whose detail message includes the expected and actual values.

Expect that the value passed as expected equals the value passed as actual. If the actual equals the expected (as determined by ==), expectResult returns normally. Else, if actual is not equal to expected, expectResult 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 total number of tests that are expected to run when this path.FreeSpec's run method is invoked.

This trait's implementation of this method will first ensure that the results of all tests, each run its its own instance executing only the path to the test, are registered. For details on this process see the How it executes section in the main documentation for this trait.

This trait's implementation of this method returns the size of the testNames List, minus the number of tests marked as ignored as well as any tests excluded by the passed Filter.

This trait's implementation of this method is marked as final. For insight onto why, see the Shared fixtures section in the main documentation for this trait.

Throws TestFailedException, with the passed Throwable cause, to indicate a test failed. The getMessage method of the thrown TestFailedException will return cause.toString().

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, to indicate a test failed.

Throws TestFailedException to indicate a test failed.

Returns an Informer that during test execution will forward strings (and other objects) passed to its apply method to the current reporter. If invoked in a constructor (including within a test, since those are invoked during construction in a path.FreeSpec, it will register the passed string for forwarding later when run is invoked. If invoked at any other time, it will throw an exception. This method can be called safely by any thread.

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.

Returns an empty list.

This lifecycle method is unused by this trait. If invoked, it will return an empty list, because nested suites are not allowed in a path.FreeSpec. Because a path.FreeSpec executes tests eagerly at construction time, registering the results of those test runs and reporting them later, the order of nested suites versus test runs would be different in a org.scalatest.path.FreeSpec than in an org.scalatest.FreeSpec. In an org.scalatest.FreeSpec, nested suites are executed then tests are executed. In an org.scalatest.path.FreeSpec it would be the opposite. To make the code easy to reason about, therefore, this is just not allowed. If you want to add nested suites to a path.FreeSpec, you can instead wrap them all in a Suites or Specs object and put them in whatever order you wish.

This trait's implementation of this method is marked as final. For insight onto why, see the Shared fixtures section in the main documentation for this trait.

Construct a new instance of this Suite.

This trait's implementation of runTests invokes this method to create a new instance of this Suite for each test. This trait's implementation of this method uses reflection to call this.getClass.newInstance. This approach will succeed only if this Suite's class has a public, no-arg constructor. In most cases this is likely to be true, because to be instantiated by ScalaTest's Runner a Suite needs a public, no-arg constructor. However, this will not be true of any Suite defined as an inner class of another class or trait, because every constructor of an inner class type takes a reference to the enclosing instance. In such cases, and in cases where a Suite class is explicitly defined without a public, no-arg constructor, you will need to override this method to construct a new instance of the Suite in some other way.

Here's an example of how you could override newInstance to construct a new instance of an inner class:

import org.scalatest.Suite

class Outer {
  class InnerSuite extends Suite with OneInstancePerTest {
    def testOne() {}
    def testTwo() {}
    override def newInstance = new InnerSuite
  }
}

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.

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.

Runs this path.FreeSpec, reporting test results that were registered when the tests were run, each during the construction of its own instance.

This trait's implementation of this method will first ensure that the results of all tests, each run its its own instance executing only the path to the test, are registered. For details on this process see the How it executes section in the main documentation for this trait.

If testName is None, this trait's implementation of this method will report the registered results for all tests except any excluded by the passed Filter. If testName is defined, it will report the results of only that named test. Because a path.FreeSpec is not allowed to contain nested suites, this trait's implementation of this method does not call runNestedSuites.

This trait's implementation of this method is marked as final. For insight onto why, see the Shared fixtures section in the main documentation for this trait.

This lifecycle method is unused by this trait, and is implemented to do nothing. If invoked, it will just return immediately.

Nested suites are not allowed in a path.FreeSpec. Because a path.FreeSpec executes tests eagerly at construction time, registering the results of those test runs and reporting them later, the order of nested suites versus test runs would be different in a org.scalatest.path.FreeSpec than in an org.scalatest.FreeSpec. In an org.scalatest.FreeSpec, nested suites are executed then tests are executed. In an org.scalatest.path.FreeSpec it would be the opposite. To make the code easy to reason about, therefore, this is just not allowed. If you want to add nested suites to a path.FreeSpec, you can instead wrap them all in a Suites or Specs object and put them in whatever order you wish.

This trait's implementation of this method is marked as final. For insight onto why, see the Shared fixtures section in the main documentation for this trait.

Runs a test.

This trait's implementation of this method will first ensure that the results of all tests, each run its its own instance executing only the path to the test, are registered. For details on this process see the How it executes section in the main documentation for this trait.

This trait's implementation reports the test results registered with the name specified by testName. Each test's name is a concatenation of the text of all describers surrounding a test, from outside in, and the test's spec text, with one space placed between each item. (See the documentation for testNames for an example.)

This trait's implementation of this method is marked as final. For insight onto why, see the Shared fixtures section in the main documentation for this trait.

This lifecycle method is unused by this trait, and will complete abruptly with UnsupportedOperationException if invoked.

This trait's implementation of this method is marked as final. For insight onto why, see the Shared fixtures section in the main documentation for this trait.

Suite style name.

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.

A Map whose keys are String tag names to which tests in this path.FreeSpec belong, and values the Set of test names that belong to each tag. If this path.FreeSpec contains no tags, this method returns an empty Map.

This trait's implementation of this method will first ensure that the results of all tests, each run its its own instance executing only the path to the test, are registered. For details on this process see the How it executes section in the main documentation for this trait.

This trait's implementation returns tags that were passed as strings contained in Tag objects passed to methods test and ignore.

This trait's implementation of this method is marked as final. For insight onto why, see the Shared fixtures section in the main documentation for this trait.

An immutable Set of test names. If this FreeSpec contains no tests, this method returns an empty Set.

This trait's implementation of this method will first ensure that the results of all tests, each run its its own instance executing only the path to the test, are registered. For details on this process see the How it executes section in the main documentation for this trait.

This trait's implementation of this method will return a set that contains the names of all registered tests. The set's iterator will return those names in the order in which the tests were registered. Each test's name is composed of the concatenation of the text of each surrounding describer, in order from outside in, and the text of the example itself, with all components separated by a space. For example, consider this FreeSpec:

import org.scalatest.path

class StackSpec extends path.FreeSpec {
  "A Stack" - {
    "when not empty" - {
      "must allow me to pop" in {}
    }
    "when not full" - {
      "must allow me to push" in {}
    }
  }
}

Invoking testNames on this FreeSpec will yield a set that contains the following two test name strings:

"A Stack when not empty must allow me to pop"
"A Stack when not full must allow me to push"

This trait's implementation of this method is marked as final. For insight onto why, see the Shared fixtures section in the main documentation for this trait.

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

This lifecycle method is unused by this trait, and will complete abruptly with UnsupportedOperationException if invoked.

This trait's implementation of this method is marked as final. For insight onto why, see the Shared fixtures section in the main documentation for this trait.

This expect method has been deprecated; Please use expectResult instead.

To get rid of the deprecation warning, simply replace expect with expectResult. The name expect will be used for a different purposes in a future version of ScalaTest.

This expect method has been deprecated; Please use expectResult instead.

To get rid of the deprecation warning, simply replace expect with expectResult. The name expect will be used for a different purposes in a future version of ScalaTest.