AssertDirectoryContentsSame compares two directories, in expected file content can be used wildcards.

AssertWildcards compares two texts, in expected value can be used wildcards, see WildcardToRegexp function.

EscapeWhitespaces escapes all whitespaces except new line -> for better difference in diff output.

FileExists returns true if file exists.

IsDir returns true if dir exists.

IsFile returns true if fle exists.

WildcardToRegexp converts string with wildcards to regexp, so it can be used in assert.Regexp.