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Example of TypeCheckedTripleEquals mixed in a test class #62

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Example of TypeCheckedTripleEquals mixed in a test class
ronanM Dec 7, 2016
ae7a079
Update usingMatchers.scala.html
ronanM Dec 7, 2016
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17 changes: 17 additions & 0 deletions app/views/userGuide/usingMatchers.scala.html
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Expand Up @@ -204,6 +204,23 @@ <h2> Checking equality with matchers </h2>
the equality constraints provided by <code>TypeCheckedTripleEquals</code>, however, the statement fails to compile. For more information
and examples, see the main documentation for <a href="@latestScaladoc/#org.scalactic.TypeCheckedTripleEquals">trait <code>TypeCheckedTripleEquals</code></a>.</p>

<p>An example of TypeCheckedTripleEquals mixed in a test class:</p>

<pre class="stHighlighted">
<span class="stReserved">import</span> org.scalatest._
<span class="stReserved">import</span> org.scalactic.TypeCheckedTripleEquals

<span class="stReserved">class</span> MyTest <span class="stReserved">extends</span> FunSuite <span class="stReserved">with</span> Matchers <span class="stReserved">with</span> TypeCheckedTripleEquals {

test("Type checked ===") {
val i : Int = 42
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Small detail, but the code convention used in the rest of the file for val declarations would be to remove the space before the : / after the variable name, so val i: Int = 42 maybe?

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done.

val s : String = "42"

i should === (s) // Do not compile because i is an Int and s is a String, great !
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Might be a little confusing, since this isn't really a valid test case, and the code would never compile...does it make more sense to have an example with i !=== (s)?

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The idea is to show the behaviour of TypeCheckedTripleEquals at compile-time.

}
}
</pre>

<a name="checkingSizeAndLength"> </a>
<h2> Checking size and length </h2>

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