org.scalatest.exceptions.TestFailedException.scala Maven / Gradle / Ivy
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/*
* Copyright 2001-2013 Artima, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.scalatest.exceptions
/**
* Exception that indicates a test failed.
*
*
* One purpose of this exception is to encapsulate information about
* the stack depth at which the line of test code that failed resides, so that information can be presented to
* the user that makes it quick to find the failing line of test code. (In other words, the user need not scan through the
* stack trace to find the correct filename and line number of the failing test.)
*
*
*
* Another purpose of this exception is to encapsulate a payload, an object to be included in a TestFailed event
* as its payload, so it can be consumed by a custom reporter that understands the payload. For example, tests could take a screen
* shot image of a GUI when a test fails, and include that as a payload. A custom reporter could listen for such payloads and
* display the screen shots to the user.
*
*
* @param messageFun a function that produces an optional detail message for this TestFailedException.
* @param cause an optional cause, the Throwable that caused this TestFailedException to be thrown.
* @param failedCodeStackDepthFun a function that produces the depth in the stack trace of this exception at which the line of test code that failed resides.
* @param payload an optional payload, which ScalaTest will include in a resulting TestFailed event
*
* @throws NullPointerException if either messageFun, cause or failedCodeStackDepthFun is null, or Some(null).
*
* @author Bill Venners
*/
class TestFailedException(
messageFun: StackDepthException => Option[String],
cause: Option[Throwable],
failedCodeStackDepthFun: StackDepthException => Int,
val payload: Option[Any]
) extends StackDepthException(messageFun, cause, failedCodeStackDepthFun) with ModifiableMessage[TestFailedException] with PayloadField with ModifiablePayload[TestFailedException] {
/**
* Constructs a TestFailedException with pre-determined message and failedCodeStackDepth. (This was
* the primary constructor form from ScalaTest 1.5 to 1.8.)
*
* @param messageFun a function that produces an optional detail message for this TestFailedException.
* @param cause an optional cause, the Throwable that caused this TestFailedException to be thrown.
* @param failedCodeStackDepthFun a function that produces the depth in the stack trace of this exception at which the line of test code that failed resides.
*
* @throws NullPointerException if either message of cause is null, or Some(null).
*/
def this(messageFun: StackDepthException => Option[String], cause: Option[Throwable], failedCodeStackDepthFun: StackDepthException => Int) =
this(messageFun, cause, failedCodeStackDepthFun, None)
/**
* Constructs a TestFailedException with pre-determined message and failedCodeStackDepth. (This was
* the primary constructor form prior to ScalaTest 1.5.)
*
* @param message an optional detail message for this TestFailedException.
* @param cause an optional cause, the Throwable that caused this TestFailedException to be thrown.
* @param failedCodeStackDepth the depth in the stack trace of this exception at which the line of test code that failed resides.
*
* @throws NullPointerException if either message of cause is null, or Some(null).
*/
def this(message: Option[String], cause: Option[Throwable], failedCodeStackDepth: Int) =
this(
StackDepthException.toExceptionFunction(message),
cause,
e => failedCodeStackDepth,
None
)
/**
* Create a TestFailedException with specified stack depth and no detail message or cause.
*
* @param failedCodeStackDepth the depth in the stack trace of this exception at which the line of test code that failed resides.
*
*/
def this(failedCodeStackDepth: Int) = this(None, None, failedCodeStackDepth)
/**
* Create a TestFailedException with a specified stack depth and detail message.
*
* @param message A detail message for this TestFailedException.
* @param failedCodeStackDepth the depth in the stack trace of this exception at which the line of test code that failed resides.
*
* @throws NullPointerException if message is null.
*/
def this(message: String, failedCodeStackDepth: Int) =
this(
{
if (message == null) throw new NullPointerException("message was null")
Some(message)
},
None,
failedCodeStackDepth
)
/**
* Create a TestFailedException with the specified stack depth and cause. The
* message field of this exception object will be initialized to
* if (cause.getMessage == null) "" else cause.getMessage.
*
* @param cause the cause, the Throwable that caused this TestFailedException to be thrown.
* @param failedCodeStackDepth the depth in the stack trace of this exception at which the line of test code that failed resides.
*
* @throws NullPointerException if cause is null.
*/
def this(cause: Throwable, failedCodeStackDepth: Int) =
this(
{
if (cause == null) throw new NullPointerException("cause was null")
if (cause.getMessage == null) None else Some(cause.getMessage)
},
Some(cause),
failedCodeStackDepth
)
/**
* Create a TestFailedException with the specified stack depth, detail
* message, and cause.
*
* Note that the detail message associated with cause is
* not automatically incorporated in this throwable's detail
* message.
*
* @param message A detail message for this TestFailedException.
* @param cause the cause, the Throwable that caused this TestFailedException to be thrown.
* @param failedCodeStackDepth the depth in the stack trace of this exception at which the line of test code that failed resides.
*
* @throws NullPointerException if either message or cause is null.
*/
def this(message: String, cause: Throwable, failedCodeStackDepth: Int) =
this(
{
if (message == null) throw new NullPointerException("message was null")
Some(message)
},
{
if (cause == null) throw new NullPointerException("cause was null")
Some(cause)
},
failedCodeStackDepth
)
/**
* Returns an exception of class TestFailedException with failedExceptionStackDepth set to 0 and
* all frames above this stack depth severed off. This can be useful when working with tools (such as IDEs) that do not
* directly support ScalaTest. (Tools that directly support ScalaTest can use the stack depth information delivered
* in the StackDepth exceptions.)
*/
def severedAtStackDepth: TestFailedException = {
val truncated = getStackTrace.drop(failedCodeStackDepth)
val e = new TestFailedException(message, cause, 0)
e.setStackTrace(truncated)
e
}
/**
* Returns an instance of this exception's class, identical to this exception,
* except with the detail message option string replaced with the result of passing
* the current detail message to the passed function, fun.
*
* @param fun A function that, given the current optional detail message, will produce
* the modified optional detail message for the result instance of TestFailedException.
*/
def modifyMessage(fun: Option[String] => Option[String]): TestFailedException = {
val mod = new TestFailedException(fun(message), cause, failedCodeStackDepth) // TODO: Seems like here I could just compose the message functions and not evaluate them, in case it is never used
mod.setStackTrace(getStackTrace)
mod
}
/**
* Returns an instance of this exception's class, identical to this exception,
* except with the payload option replaced with the result of passing
* the current payload option to the passed function, fun.
*
* @param fun A function that, given the current optional payload, will produce
* the modified optional payload for the result instance of TestFailedException.
*/
def modifyPayload(fun: Option[Any] => Option[Any]): TestFailedException = {
val currentPayload = payload
val mod = new TestFailedException(messageFun, cause, failedCodeStackDepthFun, fun(currentPayload)) // TODO: Should I be lazy about replacing the payload?
mod.setStackTrace(getStackTrace)
mod
}
/**
* Indicates whether this object can be equal to the passed object.
*/
override def canEqual(other: Any): Boolean = other.isInstanceOf[TestFailedException]
/**
* Indicates whether this object is equal to the passed object. If the passed object is
* a TestFailedException, equality requires equal message,
* cause, and failedCodeStackDepth fields, as well as equal
* return values of getStackTrace.
*/
override def equals(other: Any): Boolean =
other match {
case that: TestFailedException => super.equals(that) && payload == that.payload
case _ => false
}
/**
* Returns a hash code value for this object.
*/
override def hashCode: Int =
41 * (
super.hashCode
) + payload.hashCode
}