Template:Testcase/doc

Usage
Use to compare a template with its sandbox. Pass the raw code in nowikis as the first unnamed parameter; the existing template as the second, and the sandbox as the third. The optional named parameter id is used as a heading (to describe the test being performed); if id is omitted, parameter 1 is used. The optional named parameter layout determines whether the live and sandbox outputs are displayed side by side or on top of each other. The default value is vertical (on top of each other). A value of horizontal will produce side by side output.

If the pair of test codes in parameters 2 and 3 both produce the same output, then the test case is displayed in a collapsed table with a green heading. If the test codes produce different output (this includes white space differences), then the test is displayed in an uncollapsed table with a yellow heading.

Note that some more complex templates may cause testcases to be highlighted even when their output is the same. The cause of this is under investigation...

Example
If the sandbox code in parameter 3 gives the same output as the non-sandbox code in parameter 2:

If sandbox gives different output: