diff --git a/Cakefile b/Cakefile
index 8a5ab2787d..49379391e4 100644
--- a/Cakefile
+++ b/Cakefile
@@ -7,6 +7,7 @@ _                         = require 'underscore'
 CoffeeScript              = require './lib/coffeescript'
 helpers                   = require './lib/coffeescript/helpers'
 { setupConsole }          = require './build-support/console'
+{ PatternSet }            = require './build-support/patterns'
 
 # ANSI Terminal Colors.
 bold = red = green = yellow = reset = ''
@@ -428,27 +429,6 @@ task 'bench', 'quick benchmark of compilation time', ->
   console.log "total  #{ fmt total }"
 
 
-class PatternSet
-  constructor: (patternStrings = [], {@negated = no} = {}) ->
-    @matchers = (new RegExp p for p in patternStrings when p isnt '')
-
-  isEmpty: -> @matchers.length is 0
-
-  iterMatchers: -> @matchers[Symbol.iterator]()
-
-  test_: (arg) -> @iterMatchers().some (m) -> m.exec arg
-
-  allows: (arg) ->
-    return yes if @isEmpty()
-    if @negated
-      not @test_ arg
-    else
-      @test_ arg
-
-  @fromCommaDelimitedList: (commaListStr) => new @ (commaListStr ? '').split /,/
-  @empty: ({negated = no} = {}) => new @ [], {negated}
-
-
 # Run the CoffeeScript test suite.
 runTests = (CoffeeScript, {filePatterns, negFilePatterns, descPatterns, negDescPatterns} = {}) ->
   CoffeeScript.register() unless global.testingBrowser
@@ -457,7 +437,7 @@ runTests = (CoffeeScript, {filePatterns, negFilePatterns, descPatterns, negDescP
   negFilePatterns ?= PatternSet.empty {negated: yes}
   descPatterns ?= PatternSet.empty()
   negDescPatterns ?= PatternSet.empty {negated: yes}
-  console.dir {filePatterns, negFilePatterns, descPatterns, negDescPatterns}
+  console.dir.debug {filePatterns, negFilePatterns, descPatterns, negDescPatterns}
 
   # These are attached to `global` so that they’re accessible from within
   # `test/async.coffee`, which has an async-capable version of
@@ -577,9 +557,9 @@ option null, '--negDesc [REGEXP*]', 'test description patterns to negatively mat
 
 task 'test', 'run the CoffeeScript language test suite', ({
   file = [],
-  negFile = ['sourcemap'],
+  negFile = [],
   desc = [],
-  negDesc = ['#4418', '#4558', 'dynamic import assertion', 'assert keyword'],
+  negDesc = [],
 } = {}) ->
   testOptions =
     filePatterns: new PatternSet file
diff --git a/build-support/patterns.coffee b/build-support/patterns.coffee
new file mode 100644
index 0000000000..e164324a3e
--- /dev/null
+++ b/build-support/patterns.coffee
@@ -0,0 +1,18 @@
+exports.PatternSet = class PatternSet
+  constructor: (patternStrings = [], {@negated = no} = {}) ->
+    @matchers = (new RegExp p for p in patternStrings when p isnt '')
+
+  isEmpty: -> @matchers.length is 0
+
+  iterMatchers: -> @matchers[Symbol.iterator]()
+
+  test_: (arg) -> @iterMatchers().some (m) -> m.exec arg
+
+  allows: (arg) ->
+    return yes if @isEmpty()
+    if @negated
+      not @test_ arg
+    else
+      @test_ arg
+
+  @empty: ({negated = no} = {}) => new @ [], {negated}