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-rw-r--r--runtime/doc/testing.txt15
1 files changed, 12 insertions, 3 deletions
diff --git a/runtime/doc/testing.txt b/runtime/doc/testing.txt
index 15c5498a51..74b705c14e 100644
--- a/runtime/doc/testing.txt
+++ b/runtime/doc/testing.txt
@@ -291,8 +291,9 @@ assert_exception({error} [, {msg}]) *assert_exception()*
catch
call assert_exception('E492:')
endtry
-
-assert_fails({cmd} [, {error} [, {msg}]]) *assert_fails()*
+<
+ *assert_fails()*
+assert_fails({cmd} [, {error} [, {msg} [, {lnum}]]])
Run {cmd} and add an error message to |v:errors| if it does
NOT produce an error or when {error} is not found in the
error message. Also see |assert-return|.
@@ -311,13 +312,21 @@ assert_fails({cmd} [, {error} [, {msg}]]) *assert_fails()*
string for the first error: >
assert_fails('cmd', ['', 'E987:'])
<
+ If {msg} is empty then it is not used. Do this to get the
+ default message when passing the {lnum} argument.
+
+ When {lnum} is present and not negative, and the {error}
+ argument is present and matches, then this is compared with
+ the line number at which the error was reported. That can be
+ the line number in a function or in a script.
+
Note that beeping is not considered an error, and some failing
commands only beep. Use |assert_beeps()| for those.
Can also be used as a |method|: >
GetCmd()->assert_fails('E99:')
-assert_false({actual} [, {msg}]) *assert_false()*
+assert_false({actual} [, {msg}]) *assert_false()*
When {actual} is not false an error message is added to
|v:errors|, like with |assert_equal()|.
Also see |assert-return|.