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It is catalogued under topics including Lua-based templates, Talk message boxes and Template namespace templates.
Vinony links it to 47 Wikipedia language editions.
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This template generates a test case for two or more templates. Each template is called with the same parameters, and the test case can be displayed in various different formats.
Excerpted from Wikipedia’s “Template:Test case” article, available under the CC BY-SA 4.0 licence.