Add a test for a simple citation.

src/parser/citation.rs

@@ -176,3 +176,39 @@ fn global_suffix_end<'r, 's>(context: Context<'r, 's>, input: &'s str) -> Res<&'
         recognize(parser_with_context!(citation_reference_key)(context)),
     ))(input)
 }
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use crate::parser::element_parser::element;
+    use crate::parser::parser_context::ContextElement;
+    use crate::parser::parser_context::ContextTree;
+    use crate::parser::parser_with_context::parser_with_context;
+    use crate::parser::source::Source;
+
+    #[test]
+    fn citation_simple() {
+        let input = "[cite:@foo]";
+        let initial_context: ContextTree<'_, '_> = ContextTree::new();
+        let document_context =
+            initial_context.with_additional_node(ContextElement::DocumentRoot(input));
+        let paragraph_matcher = parser_with_context!(element(true))(&document_context);
+        let (remaining, first_paragraph) = paragraph_matcher(input).expect("Parse first paragraph");
+        let first_paragraph = match first_paragraph {
+            crate::parser::Element::Paragraph(paragraph) => paragraph,
+            _ => panic!("Should be a paragraph!"),
+        };
+        assert_eq!(remaining, "");
+        assert_eq!(first_paragraph.get_source(), "[cite:@foo]");
+        assert_eq!(first_paragraph.children.len(), 1);
+        assert_eq!(
+            first_paragraph
+                .children
+                .get(0)
+                .expect("Len already asserted to be 1"),
+            &Object::Citation(Citation {
+                source: "[cite:@foo]"
+            })
+        );
+    }
+}

toy_language.txt

@@ -1 +1 @@
-[fn:2:This is a footnote reference since it has the definition inside the brackets. This style is referred to as an "inline footnote".]
+[cite:@foo]