patch 8.1.1336: some eval functionality is not covered by tests

Problem:    Some eval functionality is not covered by tests.
Solution:   Add a few more test cases. (Masato Nishihata, closes #4374)
diff --git a/src/testdir/test_functions.vim b/src/testdir/test_functions.vim
index 7bd3ef4..b9520c7 100644
--- a/src/testdir/test_functions.vim
+++ b/src/testdir/test_functions.vim
@@ -52,6 +52,7 @@
   endif
 
   call assert_equal(0, empty(function('Test_empty')))
+  call assert_equal(0, empty(function('Test_empty', [0])))
 endfunc
 
 func Test_len()
@@ -869,6 +870,7 @@
   call assert_equal(1, count(l, 'a', 0, 1))
   call assert_equal(2, count(l, 'a', 1, 1))
   call assert_fails('call count(l, "a", 0, 10)', 'E684:')
+  call assert_fails('call count(l, "a", [])', 'E745:')
 
   let d = {1: 'a', 2: 'a', 3: 'A', 4: 'b'}
   call assert_equal(2, count(d, 'a'))
@@ -896,6 +898,8 @@
   call assert_equal(2, count("foo", "O", 1))
   call assert_equal(2, count("fooooo", "oo"))
   call assert_equal(0, count("foo", ""))
+
+  call assert_fails('call count(0, 0)', 'E712:')
 endfunc
 
 func Test_changenr()
@@ -1431,3 +1435,23 @@
 
   call delete('Xdir', 'rf')
 endfunc
+
+func Test_call()
+  call assert_equal(3, call('len', [123]))
+  call assert_fails("call call('len', 123)", 'E714:')
+  call assert_equal(0, call('', []))
+
+  function Mylen() dict
+     return len(self.data)
+  endfunction
+  let mydict = {'data': [0, 1, 2, 3], 'len': function("Mylen")}
+  call assert_fails("call call('Mylen', [], 0)", 'E715:')
+endfunc
+
+func Test_char2nr()
+  call assert_equal(12354, char2nr('あ', 1))
+endfunc
+
+func Test_eventhandler()
+  call assert_equal(0, eventhandler())
+endfunc