tests: document behavior of indent() with empty first line
indent() is documented to indent all non-empty lines, but it still
indents the first line even if it's empty. Let's have tests for that.
Differential Revision: https://phab.mercurial-scm.org/D7431
BasedOnStyle: LLVM
IndentWidth: 8
UseTab: ForIndentation
BreakBeforeBraces: Linux
AllowShortIfStatementsOnASingleLine: false
IndentCaseLabels: false
AllowShortBlocksOnASingleLine: false
AllowShortFunctionsOnASingleLine: false
IncludeCategories:
- Regex: '^<'
Priority: 1
- Regex: '^"'
Priority: 2