In this example, software under test 1 10 represents an application program under development. However, the invention is not limited to use in conjunction with a development environment and may be used in conjunction with testing at any stage in the software lifecycle. Software under test may include multiple functions, methods, procedures or other components that must be tested under a variety of operating conditions for a full test.
Accordingly, a large number of test cases may be applied to software under test as part of a test. In this example, a test is run on software under test by a test harness executing on test server Test server represents hardware that may be used to perform tests on software under test The specific hardware used in conducting tests is not a limitation on the invention and any suitable hardware may be used.
For example, the entire test environment illustrated in FIG. Alternatively the test environment may be created on multiple servers distributed throughout an enterprise.
In this embodiment, test server is configured with a test harness that applies multiple test cases to software under test Test harnesses are known in the art and any suitable test harness, whether now know or hereafter developed, may be used. Likewise, test cases applied against software under test are known in the art and any suitable method of generating test cases may be used.
The test environment of FIG. Log server is here illustrated as a computer processor having computer-readable media associated with it. The computer readable media may store a database of fault information. The fault information may include information about failures detected by the test harness on test server during prior execution of tests on software under test Such a database may have any suitable form or organization. For example, log server may store a record of each failure generated during a test executed by test server Each record may store information useful in analyzing failure information.
For example, such a record may indicate the test case executing when a failure was detected or otherwise provide fault signature information. However, any suitable fault signature may be stored in the record created by log server Examples of other data that may be used as a fault signature includes the address of the instruction in software under test being executed when an error was detected, an exception code returned by an exception handler in software under test , a data value provided to a function or other parameter that describes the operating state of the software under test before or after the failure.
The environment of FIG. In this embodiment, failure data resulting from the execution of a test an test server is passed through test result analyzer before the test result it is stored in log server Test result analyzer acts as a filter of the raw test results generated by test server by only passing on test results for recording by log server when the test result represents a failure not already stored in the failure database associated with log server The filtering provided by test result analyzer reduces the amount of information stored by log server and simplifies analysis that may eventually be performed by a human test engineer.
Test result analyzer may filter test results in any of a number of ways. In the illustrated embodiment, test result analyzer is a rule based program.
Rules within test result analyzer define which test results are passed to log server In one embodiment, test result analyzer includes rules that are pre-programmed into the test result analyzer. In other embodiments, rules used by test result analyzer are alternatively or additionally supplied by a user.
The flexibility of adding user defined rules allows test result analyzer to filter test results according to any desired algorithm. In one embodiment, results generated by executing a test on test server are filtered out, and therefore not stored by log server , when the test result matches a fault condition previously logged by log server In this example, the rules specify what it means for a failure detected by test server to match a fault condition for which a record has been previously stored by log server Such global issues may, but need not, impact many test cases.
For example, if the software under test is not properly loaded in the test environment, multiple test cases executed from test server are likely to fail for reasons unrelated to a bug in software under test By filtering out such test results that do not identify a problem in software under test , the analysis of failure information stored in log server is simplified.
By filtering out test results that are not useful in identifying bugs in software under test or are redundant of information already stored, the total amount of information that needs to be analyzed as the result of executing a test is greatly reduced. Such a capability may be particularly desirable, for example, in a team development project in which software is being concurrently developed and tested by multiple groups. A full software application developed by multiple groups may be tested during its development even though some portions of that application contains known bugs that have not been repaired.
As each group working on the application develops new software components for the overall application, those components may be tested. Failures generated during the test attributable to software components being developed by other groups may be ignored if those components were previously tested.
In this way, new software being developed by one group may be more simply tested while known bugs attributable to software developed by another group are being resolved.
Computer work station provides a user interface through which the test system may be controlled or results may be provided to a human user. Test server , workstation and log server are components as known in a conventional test environment. Test result analyzer may be readily incorporated into such a known test environment by presenting to the test harness executing on test server an interface that has the same format as an interface to a traditional log server Similarly, test result analyzer may interface with the log server by accessing log server through an interface adapted to receive test results and provide data from the database kept by log server In this embodiment, log server will contain records of failures, but the information will be filtered to reduce the total amount of information in the database.
Turning now to FIG. Test result analyzer may be implemented in any suitable manner. In this example, test result analyzer is implemented as multiple computer executable components that are stored on a computer-readable medium forming an executable program. If coded in the C programming language or other similar language, the components of test result analyzer may be implemented as a library of configurable classes. Each such class may have one or more interfaces that allows access to a major function of the test result analyzer In such an embodiment, test result analyzer is called through result generator interface In the example of FIG.
Accordingly, the test result analyzer is called by the test harness placing a call to test result generator interface In the described embodiment, result generator interface is in a format used by the test harness within test server to call a logging function as provided by log server In this way, test result analyzer may be used without modification of the test harness.
As each new test result is passed through result generator interface , result generator interface in turn provides the test result to auto analysis engine Auto analysis engine is likewise a software component that may be implemented as a class library or in any other suitable way. Auto analysis engine drives the processing of each test result as it is received through result generator interface The processing by auto analysis engine determines whether the specific test result should be reported as a failure such that it may be further analyzed or alternatively should be filtered out.
The results of the analysis by auto analysis engine are provided to result updater interface When auto analysis engine determines that further analysis of a test result is appropriate, result updater interface data may store the result in a failure log, such as a failure log kept by log server FIG.
Result updater interface may operate by placing a call to an interface provided by log server as known in the art. By providing result generator interface and result updater interface , test result analyzer may be configured to receive results from and store results in any test environment.
Its operation can therefore be made independent of any specific test harness and logging mechanism. Result updater interface may direct output for uses other than simply logging failures.
In this example, result updater interface also produces reports Such reports may contain any desired information and may be displayed for a human user on work station FIG. For example, reports may contain information identifying the number or nature of faults for which failure information was logged or was not logged. Alternatively, such reports may describe global issues identified by auto analysis engine Result updater interface may produce other outputs as desired.
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Some of the reasons we think it will have value to the wider community: Fast Dev-Test loop: Events can be sampled to support local execution of queries, short circuiting the wait and delay of submitting your job to the cluster for it to fail seven minutes later due to a misplaced semicolon.
One-box deployment for local testing and discovery: Learn before you commit to a prototype. ToolPicked eventually calls into the CreateComponents method which, as the name implies, is responsible for creating the components of ToolboxItem.
Now that I have added the controls and components to the designer, let's take a closer look at how to implement a toolbox. First, your toolbox needs to implement IToolboxService—this service is added to the service container and can be accessed by anyone who needs to use it. The main functions of IToolboxService are shown in Figure 9. To allow the items from the toolbox to be added onto the designer using the mouse or keyboard, the toolbox in the sample hooks onto the KeyDown and MouseDown events.
For the Enter key or a mouse double-click, IToolboxUser. ToolPicked is called. SerializeToolboxItem will be called on mouse up and the item will be added to the designer. When a new control or component is added to the designer, you can provide a custom name for the control by implementing INameCreationService. This makes it easier to manage these DesignSurfaces. Calling DesignSurfaceManager. You can override this function to create a custom DesignSurface and add the services.
The sample app creates a custom HostSurface by overriding this function in the HostSurfaceManager class:. You can then hook into the ActiveDesignSurfaceChanged event and update the output window in the HostSurfaceManager class, as shown here:.
So far I've created DesignSurfaces, hosted designers, added controls, implemented a toolbox, and added and accessed services like OutputWindow.
The next step is to persist the designer. The designer loader is, as you'd expect, responsible for loading the designer from some persistent state. Simple and flexible, designer loaders have very few requirements. In fact, you can create an instance of the Windows Forms designer with a one-line designer loader that simply creates an instance of System.
In addition to loading a form design, a designer loader is also responsible for saving the design. Because saving is an optional behavior, a designer loader listens to change events from the designer host and automatically saves state according to these events.
The sample app illustrates implementations of both loader types. Earlier I demonstrated loading the DesignSurface with a root component by passing in the type of the component. However, if you are using a loader, it should be used to load the design surface. The BeginLoad code snippet you'll need when using loaders should look something like this:.
The DesignerLoader is responsible for loading the root component in the DesignSurface and creating any components.
When creating a new form or any other root component, the loader simply loads it. In comparison, when loading from a code file or some other store, the loader is responsible for parsing the file or store and recreating the root component along with any other necessary components. NET Framework defines an abstract base class called DesignerLoader that is used to load and save designers from persistent storage. The base class is abstract so that any type of persistence model can be used.
This, however, adds to the complexity of implementing the class. BasicDesignerLoader provides a complete and common implementation of a designer loader minus any information related to the persistence format. Like DesignerLoader, it is abstract, not dictating anything about the persistence format.
BasicDesignerLoader does, however, handle the standard work of knowing when to save, knowing how to reload, and tracking change notifications from designers. Its features include support for multiple load dependencies, tracking of the modified bit to indicate a need to save changes, and deferred idle time reload support. The services shown in Figure 10 are added to the designer host's service container by BasicDesignerLoader. As with other services, you can change replaceable services by editing their value in the protected LoaderHost property.
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