diff --git a/src/parse/formulas.rs b/src/parse/formulas.rs
index 1a01c55..5a22b98 100644
--- a/src/parse/formulas.rs
+++ b/src/parse/formulas.rs
@@ -531,6 +531,46 @@ mod tests
 		assert_eq!(formula_remainder("p (and q)"), " (and q)");
 	}
 
+	#[test]
+	fn parse_or()
+	{
+		let formula_as_or = |i| match formula(i)
+		{
+			Formula::Or(arguments) => arguments,
+			_ => panic!("expected disjunction"),
+		};
+
+		let as_predicate = |x| match x
+		{
+			Formula::Predicate(arguments) => arguments,
+			_ => panic!("expected predicate"),
+		};
+
+		assert_eq!(format_formula("true  or  false"), "true or false");
+		assert_eq!(formula_as_or("true or false").len(), 2);
+		assert_eq!(*formula_as_or("true or false").remove(0), Formula::true_());
+		assert_eq!(*formula_as_or("true or false").remove(1), Formula::false_());
+		// The order of elements is retained
+		assert_ne!(formula("true or false"), formula("false or true"));
+		assert_eq!(format_formula("p  or  q  or  r  or  s"), "p or q or r or s");
+		assert_eq!(
+			as_predicate(*formula_as_or("p or q or r or s").remove(0)).declaration.name, "p");
+		assert_eq!(
+			as_predicate(*formula_as_or("p or q or r or s").remove(3)).declaration.name, "s");
+
+		let formula = |i| original::formula(i, &Declarations::new());
+
+		// Malformed formulas shouldn’t be accepted
+		assert!(formula("or").is_err());
+		assert!(formula("or p").is_err());
+		assert_eq!(formula_remainder("p or"), " or");
+		assert_eq!(formula_remainder("p orq"), " orq");
+		assert_eq!(formula_remainder("p or q or"), " or");
+		assert_eq!(formula_remainder("p or q orq"), " orq");
+		assert!(formula("(p or) q").is_err());
+		assert_eq!(formula_remainder("p (or q)"), " (or q)");
+	}
+
 	#[test]
 	fn parse_predicate()
 	{