diff --git a/spec/token-iterator-spec.coffee b/spec/token-iterator-spec.coffee
deleted file mode 100644
index 6ae01cd30..000000000
--- a/spec/token-iterator-spec.coffee
+++ /dev/null
@@ -1,37 +0,0 @@
-TextBuffer = require 'text-buffer'
-TokenizedBuffer = require '../src/tokenized-buffer'
-
-describe "TokenIterator", ->
-  it "correctly terminates scopes at the beginning of the line (regression)", ->
-    grammar = atom.grammars.createGrammar('test', {
-      'scopeName': 'text.broken'
-      'name': 'Broken grammar'
-      'patterns': [
-        {
-          'begin': 'start'
-          'end': '(?=end)'
-          'name': 'blue.broken'
-        }
-        {
-          'match': '.'
-          'name': 'yellow.broken'
-        }
-      ]
-    })
-
-    buffer = new TextBuffer(text: """
-      start x
-      end x
-      x
-    """)
-    tokenizedBuffer = new TokenizedBuffer({
-      buffer, config: atom.config, grammarRegistry: atom.grammars, packageManager: atom.packages, assert: atom.assert
-    })
-    tokenizedBuffer.setGrammar(grammar)
-
-    tokenIterator = tokenizedBuffer.tokenizedLines[1].getTokenIterator()
-    tokenIterator.next()
-
-    expect(tokenIterator.getBufferStart()).toBe 0
-    expect(tokenIterator.getScopeEnds()).toEqual []
-    expect(tokenIterator.getScopeStarts()).toEqual ['text.broken', 'yellow.broken']
diff --git a/spec/token-iterator-spec.js b/spec/token-iterator-spec.js
new file mode 100644
index 000000000..f6d43395c
--- /dev/null
+++ b/spec/token-iterator-spec.js
@@ -0,0 +1,43 @@
+const TextBuffer = require('text-buffer')
+const TokenizedBuffer = require('../src/tokenized-buffer')
+
+describe('TokenIterator', () =>
+  it('correctly terminates scopes at the beginning of the line (regression)', () => {
+    const grammar = atom.grammars.createGrammar('test', {
+      'scopeName': 'text.broken',
+      'name': 'Broken grammar',
+      'patterns': [
+        {
+          'begin': 'start',
+          'end': '(?=end)',
+          'name': 'blue.broken'
+        },
+        {
+          'match': '.',
+          'name': 'yellow.broken'
+        }
+      ]
+    })
+
+    const buffer = new TextBuffer({text: `\
+start x
+end x
+x\
+`})
+    const tokenizedBuffer = new TokenizedBuffer({
+      buffer,
+      config: atom.config,
+      grammarRegistry: atom.grammars,
+      packageManager: atom.packages,
+      assert: atom.assert
+    })
+    tokenizedBuffer.setGrammar(grammar)
+
+    const tokenIterator = tokenizedBuffer.tokenizedLines[1].getTokenIterator()
+    tokenIterator.next()
+
+    expect(tokenIterator.getBufferStart()).toBe(0)
+    expect(tokenIterator.getScopeEnds()).toEqual([])
+    expect(tokenIterator.getScopeStarts()).toEqual(['text.broken', 'yellow.broken'])
+  })
+)