Treat text blocks as files in `@CsvSource`

[sbrannen]

Overview

PR #2721 introduced experimental support for text blocks in @CsvSource; however, there is room for improvement.

A CSV line within a text block cannot currently contain a new line (\n), even if it is within a quoted string; whereas, this is supported when using @CsvSource(value = ...).

Comments do not make sense in a single string in @CsvSource(value = ...), but they do make sense within @CsvSource(textBlock = ...).

Related Issues

• Allow rows in @CsvSource to start with a number sign (#) #2528
• Introduce support for text blocks in @CsvSource #2721
• Make quote character in @CsvSource and @CsvFileSource configurable #2735

Deliverables

• Support \n within quoted strings in text blocks.
• Support comment lines beginning with # in text blocks.
• Implement robust solution for sanitizing a text block, since String#stripIndent() is only available on JDK 15+.
• Document in the User Guide.
• Document in the Release Notes.

[sbrannen]

Current work on this issue can be viewed in the following feature branch:

main...sbrannen:issues/2734-treat-text-blocks-as-files-in-CsvSource