--- a/tests/misc.py	Sun Jun 23 00:42:34 2019 +0300
+++ b/tests/misc.py	Sun Jun 23 00:50:22 2019 +0300
@@ -159,6 +159,31 @@
             bad_object = model.body[0],
         )
 
+@problem_type('bfc-invertnext-not-on-subfile',
+    severity = 'hold',
+    message = '"BFC INVERTNEXT" not followed by a type-1 line',
+)
+def bfc_invertnext_not_on_subfile_test(model):
+    def get_invertnexts(model):
+        yield from [
+            (index, element)
+            for index, element in enumerate(model.body)
+            if isinstance(element, linetypes.MetaCommand) \
+                and element.text == 'BFC INVERTNEXT'
+        ]
+    def has_subfile_after_invertnext(index):
+        index_subfile = index + 1 # subfile reference should be on the next line
+        if index_subfile >= len(model.body):
+            return False # past the end...
+        else:
+            element = model.body[index_subfile]
+            return isinstance(element, linetypes.SubfileReference)
+    for index, invertnext in get_invertnexts(model):
+        if not has_subfile_after_invertnext(index):
+            yield report_problem('bfc-invertnext-not-on-subfile',
+                bad_object = model.body[index],
+            )
+
 manifest = {
     'tests': [
         colours_test,
@@ -171,5 +196,6 @@
         keywords_tests,
         colour_24_test,
         moved_to_with_extension_test,
+        bfc_invertnext_not_on_subfile_test,
     ],
 }