diff --git a/tests/test-data-lookbehind.json b/tests/test-data-lookbehind.json
index c6c5b86..f987102 100644
--- a/tests/test-data-lookbehind.json
+++ b/tests/test-data-lookbehind.json
@@ -346,5 +346,11 @@
       6
     ],
     "raw": "(?<!.)"
+  },
+  "\\k": {
+    "type": "error",
+    "name": "SyntaxError",
+    "message": "atomEscape at position 1\n    \\k\n     ^",
+    "input": "\\k"
   }
 }
diff --git a/tests/test-data-named-groups-unicode.json b/tests/test-data-named-groups-unicode.json
index 76723db..a3b52cc 100644
--- a/tests/test-data-named-groups-unicode.json
+++ b/tests/test-data-named-groups-unicode.json
@@ -59,8 +59,43 @@
   },
   "(?<\\u{ffffff})": {
     "type": "error",
-    "name": "SyntaxError",
-    "message": "Invalid escape sequence at position 3\n    (?<\\u{ffffff})\n       ^",
+    "name": "RangeError",
+    "message": "Invalid code point 16777215",
     "input": "(?<\\u{ffffff})"
+  },
+  "(?<$𐒤>a)": {
+    "type": "group",
+    "behavior": "normal",
+    "body": [{
+      "type": "value",
+      "kind": "symbol",
+      "codePoint": 97,
+      "range": [7, 8],
+      "raw": "a"
+    }],
+    "range": [0, 9],
+    "raw": "(?<$𐒤>a)",
+    "name": {
+      "type": "identifier",
+      "value": "$𐒤",
+      "range": [
+        3,
+        6
+      ],
+      "raw": "$𐒤"
+    }
+  },
+  "(?<\\u{102A7}Ƞ>)": {
+    "type": "group",
+    "behavior": "normal",
+    "body": [],
+    "range": [0, 15],
+    "raw": "(?<\\u{102A7}Ƞ>)",
+    "name": {
+      "type": "identifier",
+      "value": "𐊧Ƞ",
+      "range": [3, 13],
+      "raw": "\\u{102A7}Ƞ"
+    }
   }
 }
diff --git a/tests/test-data-unicode-properties.json b/tests/test-data-unicode-properties.json
index 6debb53..cf911ae 100644
--- a/tests/test-data-unicode-properties.json
+++ b/tests/test-data-unicode-properties.json
@@ -182,13 +182,13 @@
   "\\p{}": {
     "type": "error",
     "name": "SyntaxError",
-    "message": "Expected atom at position 2\n    \\p{}\n      ^",
+    "message": "atomEscape at position 1\n    \\p{}\n     ^",
     "input": "\\p{}"
   },
   "\\P{}": {
     "type": "error",
     "name": "SyntaxError",
-    "message": "Expected atom at position 2\n    \\P{}\n      ^",
+    "message": "atomEscape at position 1\n    \\P{}\n     ^",
     "input": "\\P{}"
   }
 }
diff --git a/tests/test-data-unicode.json b/tests/test-data-unicode.json
index d8e57b9..b94de3d 100644
--- a/tests/test-data-unicode.json
+++ b/tests/test-data-unicode.json
@@ -898,5 +898,11 @@
     "name": "SyntaxError",
     "message": "Invalid escape sequence at position 1\n    \\u{110000}\n     ^",
     "input": "\\u{110000}"
+  },
+  "\\a": {
+    "type": "error",
+    "name": "SyntaxError",
+    "message": "atomEscape at position 1\n    \\a\n     ^",
+    "input": "\\a"
   }
 }