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The first portion of an ACL, reading left to right as at least Westerners are used to, is a 16-bit value holding the size of the ACL in bytes. This means that an ACL can be up to 64 kilobytes (KB). Apart from the revision, the only other interesting aspect is the ACL Entry (ACE) count. The ACEs are attached to the ACL but are usually thought of as a separate structure.

The ACE is essentially where the rubber meets the road in access control. The ACE defines the subject and what permissions that subject has to the object. The ACE structure is shown in Figure 3-3.

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The difficulty with oracles is accurately predicting the result of the operations they are verifying Accurate oracles require extensive knowledge of the functionality under test and clear documentation of the intent of the functionality At a minimum, they must verify success, but they also must verify a variety of environment and program changes that occur in parallel or as side effects of testing functionality The Challenge of Oracles One of my responsibilities on the Windows 98 team was testing the graphic functions of the Windows operating system, such as the drawing of text and shapes on the screen On Windows, the SetPixel function changes the pixel at given coordinates to a specified color The related GetPixel function retrieves the color of a pixel at a given coordinate I remember an interesting late-night conversation I had related to oracles and the functions that manipulated pixels on the screen.

Quick Styles is a feature common to all core Microsoft Office system applications, offering you different selections you can preview and then apply to your slides with a click of the mouse. The Quick Styles that are available depend on the object you select. When you are working in the Design tab, the Background Styles command provides a collection of background styles you can apply to the current slide or to all slides in your presentation.

Part I:

3 3 2 2 2 2 2 2 2 2 2 2 1 1 1 1 1 1 1 1 1 1 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0 ACE Size Access Mask SID ACE Flags ACE Type

The discussion revolved around whether we could safely use GetPixel as the oracle to test SetPixel In other words, if I set the color of a specific pixel using SetPixel, could I trust GetPixel to retrieve the data, rather than just directly return the value I used in the SetPixel call I started to design and prototype some code to query the display driver data structures and attempt to determine the color of the pixel without calling GetPixel, but someone obviously smarter than me pointed out that was exactly what GetPixel did anyway The answer was yes, I could safely use GetPixel to test SetPixel, but it's still something I hear questioned from time to time, and something that always reminds me of the philosophy of oracles.

Figure 3-3

You can make additional choices for the background of your slides by clicking the Background command in the Background Styles gallery. The Format Background dialog box that appears enables you to choose a picture or texture for the background (see Figure 6-5). You can also make changes to background colors by choosing a new color scheme.

The first part of an ACE is the size attribute. It also is a 16-bit value, but obviously an ACE cannot be that large because that would make it too large to hold in an ACL. However, the ACE is variable-sized because it contains a SID, which is variable-sized. The SID defines which subject the ACE applies to. The ACE also has a set of 8 flags, as well as 8 bits defining the ACE type. The flags define how the ACE was created or processed. Some of the more interesting flags are shown in Table 3-2, which also shows the Security Descriptor Definition Language (SDDL) shortcuts. These will be discussed in more detail in the section Security Descriptor Definition Language later in the chapter.

When running manual tests, it is usually straightforward to determine whether the test passes or fails, or whether certain tests should not be run because of various circumstances in the testing environment Automated tests, however, must try to determine this without human intervention As discussed previously, determining pass and fail can have challenges The gray area between pass and fail often causes confusion, but it is essential to understand results beyond pass and fail to accurately report the complete status of automated tests Several types of potential test results are listed in Table 10-4 Table 10-4: Test Result Types Open table as spreadsheet Result Description Pass Fail Skip The test passed The test failed Skipped tests typically occur when tests are available for optional functionality For example, a.

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