Enterprise Library Test Guide - Willy .Net

Testing the Enterprise Library Core 75
Code test case
Verify that the configuration
properties of the exception
handling policies are
exposed as public and that
they are strongly typed.
Verify that the configuration
properties for the custom
exception handlers are
exposed as public and that
they are implemented as a
collection.
Verify that the application
block validates the input at
all the entry points, such
as the ExceptionPolicy
façade.
Verify that the Exception-
PolicyFactory class only
creates a single instance
of the exception handling
provider for all requests.
Implemented?
Yes
Yes
Yes
Yes
Feature that is implemented
For example, in the ExceptionHandlingSettings class,
the ExceptionPolicies property can only contain an
ExceptionPolicyData collection. The following code
demonstrates this.
[ConfigurationProperty(policiesProperty)]
public NamedElementCollection ExceptionPolicies
{
get { return (NamedElementCollection
)this[policiesProperty];
}
}
The CustomHandlerData class has a reference to the
CustomProviderDataHelper class. This class adds the
properties that are defined in the configuration source
to an instance of the NameValueCollection class. This
is shown in the following code example.
private NameValueCollection attributes;
private void AddAttributesFromConfigurationProperties()
{
foreach (ConfigurationProperty property in
propertiesCollection)
{
…
attributes.Add(property.Name, (string)helped
CustomProviderData.BaseGetPropertyValue(prop
erty));
}
}
The ExceptionPolicy façade validates the input parameters
that are passed to the HandleException method.
This is shown in the following code example.
public static bool HandleException(Exception
exceptionToHandle, string policyName)
{
if (exceptionToHandle == null) throw new
ArgumentNullException("exceptionToHandle");
if(string.IsNullOrEmpty(policyName))
throw new ArgumentException(…);
}
The ExceptionPolicyFactory class derives from the
LocatorNameTypeFactoryBase class. This class only
creates a single instance for all requests.
continued