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Tests for L{twisted.python.versions}.
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Versions can be compared for equality and order.
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Version packages are compared case insensitively.
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Prereleases are always less than versions without prereleases.
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The value specified as the prerelease is used in version comparisons.
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L{_inf} is equal to L{_inf}.
This is a regression test.
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The package names of the Version objects need to be the same,
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Comparing a L{Version} to some other object type results in
C{NotImplemented}.
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Calling C{repr} on a version returns a human-readable string
representation of the version.
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Calling C{repr} on a version with a prerelease returns a human-readable
string representation of the version including the prerelease.
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Calling C{str} on a version returns a human-readable string
representation of the version.
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Calling C{str} on a version with a prerelease includes the prerelease.
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L{getVersionString} returns a string with the package name and the
short version number.
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L{getVersionString} includes the prerelease, if any.
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The L{base} method returns a very simple representation of the version.
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The base version includes 'preX' for versions with prereleases.
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