Review Request: XTest is an optional dependency, so skip a test that requires it if it is not found

[Ralf Jung]

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Review request for Plasma.


Description
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Running cmake without having libxtest fails as some tests that are always compiled use it unconditionally. This fixes these tests to be only compiled if libxtest is found, as it is marked as optional dependency.


Diffs
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  kcontrol/keyboard/tests/CMakeLists.txt 419d150 

Diff: http://git.reviewboard.kde.org/r/102771/diff/diff


Testing
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kde-workspace compiles now.


Thanks,

Ralf Jung

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