add missing test file

src/testdir/test_glob2regpat.vim

@@ -0,0 +1,10 @@
+" Test glob2regpat()
+
+func Test_invalid()
+  call assert_fails('call glob2regpat(1.33)', 'E806:')
+endfunc
+
+func Test_valid()
+  call assert_equal('^foo\.', glob2regpat('foo.*'))
+  call assert_equal('\.vim$', glob2regpat('*.vim'))
+endfunc