Spiced up the feature detection

Cakefile

@@ -467,7 +467,9 @@ runTests = (CoffeeScript) ->
   # current Node runtime.
   testFilesToSkip = []
   skipUnless = (featureDetect, filenames) ->
-    unless (try new Function featureDetect)
+    try
+      await (new Function featureDetect)()
+    catch
       testFilesToSkip = testFilesToSkip.concat filenames
   skipUnless 'async () => {}', ['async.coffee', 'async_iterators.coffee']
   skipUnless 'async function* generator() { yield 42; }', ['async_iterators.coffee']
@@ -476,7 +478,7 @@ runTests = (CoffeeScript) ->
   skipUnless '/foo.bar/s.test("foo\tbar")', ['regex_dotall.coffee']
   skipUnless '1_2_3', ['numeric_literal_separators.coffee']
   skipUnless '1n', ['numbers_bigint.coffee']
-  skipUnless 'async () => { await import(\'data:application/json,{"foo":"bar"}\', { assert: { type: "json" } }) }', ['import_assertions.coffee']
+  await skipUnless 'return import(\'data:application/json,{"foo":"bar"}\', { assert: { type: "json" } })', ['import_assertions.coffee']
   files = fs.readdirSync('test').filter (filename) ->
     filename not in testFilesToSkip
 

test/import_assertions.coffee

@@ -1,21 +1,19 @@
 # This file is running in CommonJS (in Node) or as a classic Script (in the browser tests) so it can use import() within an async function, but not at the top level; and we can’t use static import.
 test "dynamic import assertion", ->
-  if typeof process is "undefined" or process.version?.startsWith("v17")
-    { default: secret } = await import('data:application/json,{"ofLife":42}', { assert: { type: 'json' } })
-    eq secret.ofLife, 42
+  { default: secret } = await import('data:application/json,{"ofLife":42}', { assert: { type: 'json' } })
+  eq secret.ofLife, 42
 
 test "assert keyword", ->
-  if typeof process is "undefined" or process.version?.startsWith("v17")
-    assert = 1
+  assert = 1
 
-    { default: assert } = await import('data:application/json,{"thatIAm":42}', { assert: { type: 'json' } })
-    eq assert.thatIAm, 42
+  { default: assert } = await import('data:application/json,{"thatIAm":42}', { assert: { type: 'json' } })
+  eq assert.thatIAm, 42
 
-    eqJS """
-      import assert from 'regression-test'
-    """, """
-      import assert from 'regression-test';
-    """
+  eqJS """
+    import assert from 'regression-test'
+  """, """
+    import assert from 'regression-test';
+  """
 
 test "static import assertion", ->
   eqJS """