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test: Add unit test for function fold_prefix_suffix

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Original file line number	Diff line number	Diff line change
`@@ -1722,3 +1722,32 @@ fn format_inline_marks(`
`1722`	`1722`	`}`
`1723`	`1723`	`Ok(())`
`1724`	`1724`	`}`
	`1725`	`+`
	`1726`	`+#[cfg(test)]`
	`1727`	`+mod tests {`
	`1728`	`+ use super::*;`
	`1729`	`+ use crate::{Level, Snippet};`
	`1730`	`+`
	`1731`	`+ #[test]`
	`1732`	`+ fn test_fold_prefix_suffix() {`
	`1733`	`+ // No folding`
	`1734`	`+ let snippets = Snippet::source("No folding");`
	`1735`	`+ let unfold_snippets = fold_prefix_suffix(snippets);`
	`1736`	`+`
	`1737`	`+ assert_eq!(unfold_snippets.fold, false);`
	`1738`	`+ assert_eq!(unfold_snippets.line_start, 1);`
	`1739`	`+ assert_eq!(unfold_snippets.source, "No folding");`
	`1740`	`+ assert_eq!(unfold_snippets.annotations.len(), 0);`
	`1741`	`+`
	`1742`	`+ // Folding`
	`1743`	`+ let snippets = Snippet::source("First line\r\nSecond line\r\nThird oops line")`
	`1744`	`+ .annotation(Level::Error.span(32..36).label("oops"))`
	`1745`	`+ .fold(true);`
	`1746`	`+`
	`1747`	`+ let fold_snippets = fold_prefix_suffix(snippets);`
	`1748`	`+ assert_eq!(fold_snippets.fold, true);`
	`1749`	`+ assert_eq!(fold_snippets.line_start, 3);`
	`1750`	`+ assert_eq!(fold_snippets.source, "Third oops line");`
	`1751`	`+ assert_eq!(fold_snippets.annotations.len(), 1);`
	`1752`	`+ }`
	`1753`	`+}`

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