trait FixtureContext extends scalatest.compatible.Assertion
Marker trait for fixture-context objects, that enables them
to be used in testing styles that require type Assertion
A fixture-context object is a way to share fixtures between different tests that is most useful when different tests need different combinations of fixture objects. The fixture-context object technique is only appropriate if you don't need to clean up the fixtures after using them.
To use this technique, you define instance variables intialized with fixture
objects in traits and/or classes, then in each test instantiate an object that
contains just the fixture objects needed by the test. Traits allow you to mix
together just the fixture objects needed by each test, whereas classes
allow you to pass data in via a constructor to configure the fixture objects.
Here's an example FlatSpec
in which fixture objects are partitioned
into two traits and each test just mixes together the traits it needs:
package org.scalatest.examples.flatspec.fixturecontext import collection.mutable.ListBuffer import org.scalatest.FlatSpec import org.scalatest.FixtureContext class ExampleSpec extends FlatSpec { trait Builder extends FixtureContext { val builder = new StringBuilder("ScalaTest is ") } trait Buffer extends FixtureContext { val buffer = ListBuffer("ScalaTest", "is") } // This test needs the StringBuilder fixture "Testing" should "be productive" in new Builder { builder.append("productive!") assert(builder.toString === "ScalaTest is productive!") } // This test needs the ListBuffer[String] fixture "Test code" should "be readable" in new Buffer { buffer += ("readable!") assert(buffer === List("ScalaTest", "is", "readable!")) } // This test needs both the StringBuilder and ListBuffer it should "be clear and concise" in new Builder with Buffer { builder.append("clear!") buffer += ("concise!") assert(builder.toString === "ScalaTest is clear!") assert(buffer === List("ScalaTest", "is", "concise!")) } }
Extending FixtureContext
, which extends trait org.scalatest.compatible.Assertion
makes
it more convenient to use fixture-context objects in styles, such as async styles, that require test bodies
to have type Assertion
.
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- FixtureContext.scala
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