Editing Module:ScribuntoUnit/doc (section)

=== assertStringContains ===

<syntaxhighlight lang="lua">
self:assertStringContains(pattern, s, plain, message)
</syntaxhighlight>

This tests whether <code>pattern</code> is found in the string <code>s</code>. If <code>plain</code> is true, then <code>pattern</code> is interpreted as literal text; otherwise, <code>pattern</code> is interpreted as a [[mw:Extension:Scribunto/Lua reference manual#Ustring patterns|ustring pattern]].

If the string is not found, the error message shows the values of <code>pattern</code> and <code>s</code>; if <code>s</code> is more than 70 characters long then a truncated version is displayed. This method is useful for testing specific behaviours in complex wikitext.

<syntaxhighlight lang="lua">
self:assertStringContains("foo", "foobar") -- passes
self:assertStringContains("foo", "fobar") -- fails
self:assertStringContains(".oo", "foobar") -- passes: matches "foo"
self:assertStringContains(".oo", "foobar", true) -- fails: . is interpreted as a literal character
</syntaxhighlight>