Missing '=' when using complex expressions in Test with file

[Nicklas Nordborg]

The "Test with file" function has a function (Auto generate) that automatically creates mappings for column based on the likeness with headers. When the "Mapping style" option is set to "Expression" the created mapping is missing an equal sign as the first character. Without the equal sign the mapping is not parsed.

The workaround is to use "Simple" mapping style or to manually insert an equal sign.

[Nicklas Nordborg]

In 7659:

Fixes #2162: Missing '=' when using complex expressions in Test with file