diff --git a/package.json b/package.json
index 9cdb65d..fea3673 100644
--- a/package.json
+++ b/package.json
@@ -10,6 +10,7 @@
     "lint": "standard",
     "bench": "node bench/index.js",
     "preview": "node preview/serve.js",
+    "snaptests": "TAP_SNAPSHOT=1 npm test",
     "pretest": "npm run lint",
     "test": "tap test/*.spec.js --reporter spec --coverage"
   },
diff --git a/tap-snapshots/test-calc-text-width.spec.js-TAP.test.js b/tap-snapshots/test-calc-text-width.spec.js-TAP.test.js
new file mode 100644
index 0000000..ef069d0
--- /dev/null
+++ b/tap-snapshots/test-calc-text-width.spec.js-TAP.test.js
@@ -0,0 +1,18 @@
+/* IMPORTANT
+ * This snapshot file is auto-generated, but designed for humans.
+ * It should be checked into source control and tracked carefully.
+ * Re-generate by setting TAP_SNAPSHOT=1 and running tests.
+ * Make sure to inspect the output below.  Do not ignore changes!
+ */
+'use strict'
+exports[`test/calc-text-width.spec.js TAP calc width for "npm" > result is correct 1`] = `
+24.9
+`
+
+exports[`test/calc-text-width.spec.js TAP calc width for unicode > result is correct 1`] = `
+56
+`
+
+exports[`test/calc-text-width.spec.js TAP calc width for emojis > result is correct 1`] = `
+33.6
+`
diff --git a/test/calc-text-width.spec.js b/test/calc-text-width.spec.js
index e78fc57..c25b9e4 100644
--- a/test/calc-text-width.spec.js
+++ b/test/calc-text-width.spec.js
@@ -9,12 +9,17 @@ tap.test('basic functions', t => {
 })
 
 tap.test('calc width for "npm"', t => {
-  t.is(calcWidth('npm'), 24.9, 'result is correct value')
+  t.matchSnapshot(calcWidth('npm'), 'result is correct')
   t.end()
 })
 
 tap.test('calc width for unicode', t => {
-  t.is(calcWidth('壹佰贰拾叁'), 56, 'result is correct value')
+  t.matchSnapshot(calcWidth('壹佰贰拾叁'), 'result is correct')
+  t.end()
+})
+
+tap.test('calc width for emojis', t => {
+  t.matchSnapshot(calcWidth('💩🤱🦄', true), 'result is correct')
   t.end()
 })