diff --git a/tests/api.rs b/tests/api.rs
index 0d4962c..c7250a8 100644
--- a/tests/api.rs
+++ b/tests/api.rs
@@ -195,6 +195,18 @@
 );
 expand!(expand10, r"(?-u)(?P<a>\w+)\s+(?P<b>\d+)", "abc 123", "$bz$az", "");
 
+expand!(expand_name1, r"%(?P<Z>[a-z]+)", "%abc", "$Z%", "abc%");
+expand!(expand_name2, r"\[(?P<Z>[a-z]+)", "[abc", "$Z[", "abc[");
+expand!(expand_name3, r"\{(?P<Z>[a-z]+)", "{abc", "$Z{", "abc{");
+expand!(expand_name4, r"\}(?P<Z>[a-z]+)", "}abc", "$Z}", "abc}");
+expand!(expand_name5, r"%([a-z]+)", "%abc", "$1a%", "%");
+expand!(expand_name6, r"%([a-z]+)", "%abc", "${1}a%", "abca%");
+expand!(expand_name7, r"\[(?P<Z[>[a-z]+)", "[abc", "${Z[}[", "abc[");
+expand!(expand_name8, r"\[(?P<Z[>[a-z]+)", "[abc", "${foo}[", "[");
+expand!(expand_name9, r"\[(?P<Z[>[a-z]+)", "[abc", "${1a}[", "[");
+expand!(expand_name10, r"\[(?P<Z[>[a-z]+)", "[abc", "${#}[", "[");
+expand!(expand_name11, r"\[(?P<Z[>[a-z]+)", "[abc", "${$$}[", "[");
+
 split!(
     split1,
     r"(?-u)\s+",
diff --git a/tests/set.rs b/tests/set.rs
index 648feec..37fcf87 100644
--- a/tests/set.rs
+++ b/tests/set.rs
@@ -54,3 +54,14 @@
     let set = regex_set!(&["a", "b"]);
     assert_eq!(vec!["a", "b"], set.patterns());
 }
+
+#[test]
+fn len_and_empty() {
+    let empty = regex_set!(&[""; 0]);
+    assert_eq!(empty.len(), 0);
+    assert!(empty.is_empty());
+
+    let not_empty = regex_set!(&["ab", "b"]);
+    assert_eq!(not_empty.len(), 2);
+    assert!(!not_empty.is_empty());
+}
diff --git a/tests/unicode.rs b/tests/unicode.rs
index 52522f4..9f1cd0c 100644
--- a/tests/unicode.rs
+++ b/tests/unicode.rs
@@ -74,6 +74,9 @@
     Some((0, 3))
 );
 mat!(uni_class_gencat_format, r"\p{Format}", "\u{E007F}", Some((0, 4)));
+// See: https://github.com/rust-lang/regex/issues/719
+mat!(uni_class_gencat_format_abbrev1, r"\p{cf}", "\u{E007F}", Some((0, 4)));
+mat!(uni_class_gencat_format_abbrev2, r"\p{gc=cf}", "\u{E007F}", Some((0, 4)));
 mat!(
     uni_class_gencat_initial_punctuation,
     r"\p{Initial_Punctuation}",