diff --git a/src/testdir/test_python3.vim b/src/testdir/test_python3.vim
index 1fb22fc..0082751 100644
--- a/src/testdir/test_python3.vim
+++ b/src/testdir/test_python3.vim
@@ -798,6 +798,9 @@
   py3 l = vim.bindeval('l')
   py3 l[2:2:1] = ()
   call assert_equal([0, 1, 2, 3, 4, 5, 6, 7], l)
+
+  call AssertException(["py3 x = l[10:11:0]"],
+        \ "Vim(py3):ValueError: slice step cannot be zero")
 endfunc
 
 " Locked variables
@@ -987,6 +990,10 @@
   call assert_equal(0, py3eval("vim.bindeval('v:false')"))
   call assert_equal(v:none, py3eval("vim.bindeval('v:null')"))
   call assert_equal(v:none, py3eval("vim.bindeval('v:none')"))
+
+  " channel/job
+  call assert_equal(v:none, py3eval("vim.bindeval('test_null_channel()')"))
+  call assert_equal(v:none, py3eval("vim.bindeval('test_null_job()')"))
 endfunc
 
 " threading
@@ -1580,6 +1587,20 @@
   call assert_equal([], py3eval('b[2:0]'))
   call assert_equal([], py3eval('b[10:12]'))
   call assert_equal([], py3eval('b[-10:-8]'))
+  call AssertException(["py3 x = b[0:3:0]"],
+        \ 'Vim(py3):ValueError: slice step cannot be zero')
+  call AssertException(["py3 b[0:3:0] = 'abc'"],
+        \ 'Vim(py3):ValueError: slice step cannot be zero')
+  call AssertException(["py3 x = b[{}]"],
+        \ 'Vim(py3):TypeError: index must be int or slice, not dict')
+  call AssertException(["py3 b[{}] = 'abc'"],
+        \ 'Vim(py3):TypeError: index must be int or slice, not dict')
+
+  " Test for getting lines using a range
+  call AssertException(["py3 x = b.range(0,3)[0:2:0]"],
+        \ "Vim(py3):ValueError: slice step cannot be zero")
+  call AssertException(["py3 b.range(0,3)[0:2:0] = 'abc'"],
+        \ "Vim(py3):ValueError: slice step cannot be zero")
 
   " Tests BufferAppend and BufferItem
   py3 cb.append(b[0])
@@ -1690,6 +1711,9 @@
   py3 vim.current.buffer[:] = []
   call assert_equal([''], getline(1, '$'))
 
+  " Test for buffer marks
+  call assert_equal(v:none, py3eval("vim.current.buffer.mark('r')"))
+
   " Test for modifying a 'nomodifiable' buffer
   setlocal nomodifiable
   call AssertException(["py3 vim.current.buffer[0] = 'abc'"],
@@ -2578,6 +2602,7 @@
   call assert_equal(["b'testdir'", 'Xfile', "b'src'", 'testdir/Xfile',
         \"b'testdir'", 'Xfile'], getline(2, '$'))
   close!
+  call AssertException(["py3 vim.chdir(None)"], "Vim(py3):TypeError:")
 endfunc
 
 " Test errors