diff --git a/test/test.js b/test/test.js
index eda3016..b7b9011 100644
--- a/test/test.js
+++ b/test/test.js
@@ -1184,7 +1184,7 @@ describe('include', () => {
 })
 
 
-describe('RegExp flags', () => {
+describe('ignoreCase flag', () => {
 
   test("allows all rules to be /i", () => {
     expect(() => compile({ a: /foo/i, b: /bar/i })).not.toThrow()
@@ -1237,22 +1237,6 @@ describe('RegExp flags', () => {
     })).not.toThrow()
   })
 
-  test("allows all rules to be /u", () => {
-    expect(() => compile({ a: /foo/u, b: /bar/u, c: "quxx" })).not.toThrow()
-    expect(() => compile({ a: /foo/u, b: /bar/, c: "quxx" })).toThrow("If one RegExp sets the unicode flag then all must")
-    expect(() => compile({ a: /foo/, b: /bar/u, c: "quxx" })).toThrow("If one RegExp sets the unicode flag then all must")
-  })
-
-  test("allows all rules to be /ui", () => {
-    expect(() => compile({ a: /foo/ui, b: /bar/ui })).not.toThrow()
-    expect(() => compile({ a: /foo/u, b: /bar/i })).toThrow("If one rule ignores case then all must")
-    expect(() => compile({ a: /foo/i, b: /bar/u })).toThrow("If one rule ignores case then all must")
-    expect(() => compile({ a: /foo/ui, b: /bar/i })).toThrow("If one RegExp sets the unicode flag then all must")
-    expect(() => compile({ a: /foo/ui, b: /bar/u })).toThrow("If one rule ignores case then all must")
-    expect(() => compile({ a: /foo/i, b: /bar/ui })).toThrow("If one RegExp sets the unicode flag then all must")
-    expect(() => compile({ a: /foo/u, b: /bar/ui })).toThrow("If one rule ignores case then all must")
-  })
-
   test("supports ignoreCase for everything", () => {
     const lexer = compile({
       a: /foo/i,
@@ -1278,3 +1262,42 @@ describe('RegExp flags', () => {
   })
 
 })
+
+
+describe("unicode flag", () => {
+
+  test("allows all rules to be /u", () => {
+    expect(() => compile({ a: /foo/u, b: /bar/u, c: "quxx" })).not.toThrow()
+    expect(() => compile({ a: /foo/u, b: /bar/, c: "quxx" })).toThrow("If one RegExp sets the unicode flag then all must")
+    expect(() => compile({ a: /foo/, b: /bar/u, c: "quxx" })).toThrow("If one RegExp sets the unicode flag then all must")
+  })
+
+  test("allows all rules to be /ui", () => {
+    expect(() => compile({ a: /foo/ui, b: /bar/ui })).not.toThrow()
+    expect(() => compile({ a: /foo/u, b: /bar/i })).toThrow("If one rule ignores case then all must")
+    expect(() => compile({ a: /foo/i, b: /bar/u })).toThrow("If one rule ignores case then all must")
+    expect(() => compile({ a: /foo/ui, b: /bar/i })).toThrow("If one RegExp sets the unicode flag then all must")
+    expect(() => compile({ a: /foo/ui, b: /bar/u })).toThrow("If one rule ignores case then all must")
+    expect(() => compile({ a: /foo/i, b: /bar/ui })).toThrow("If one RegExp sets the unicode flag then all must")
+    expect(() => compile({ a: /foo/u, b: /bar/ui })).toThrow("If one rule ignores case then all must")
+  })
+
+  test("supports unicode", () => {
+    const lexer = compile({
+      a: /[𝌆]/u,
+    })
+    lexer.reset("𝌆")
+    expect(lexer.next()).toMatchObject({value: "𝌆"})
+    lexer.reset("𝌆".charCodeAt(0))
+    expect(() => lexer.next()).toThrow()
+
+    const lexer2 = compile({
+      a: /\u{1D356}/u,
+    })
+    lexer2.reset("𝍖")
+    expect(lexer2.next()).toMatchObject({value: "𝍖"})
+    lexer2.reset("\\u{1D356}")
+    expect(() => lexer2.next()).toThrow()
+  })
+
+})