Add docs and test for maps:get/3

3 files changed, 91 insertions, 1 deletions

diff --git a/lib/stdlib/doc/src/maps.xml b/lib/stdlib/doc/src/maps.xml
index 76137e3dee..a6bb120d07 100644
--- a/lib/stdlib/doc/src/maps.xml
+++ b/lib/stdlib/doc/src/maps.xml
@@ -108,6 +108,26 @@
 		</func>
 
 		<func>
+            		<name name="get" arity="3"/>
+ 			<fsummary></fsummary>
+ 			<desc>
+	                	<p>
+	                		Returns the value <c><anno>Value</anno></c> associated with <c><anno>Key</anno></c> if
+					<c><anno>Map</anno></c> contains <c><anno>Key</anno></c>.
+					If no value is associated with <c><anno>Key</anno></c> then returns <c><anno>Default</anno></c>.
+				</p>
+				<p>Example:</p>
+				<code type="none">
+>Map = #{ key1 => val1, key2 => val2 }.
+ #{key1 => val1,key2 => val2}
+ maps:get(key1, Map, "Default value").
+ val1
+ maps:get(key3, Map, "Default value").
+ "Default value"</code>
+			</desc>
+		</func>
+
+		<func>
 			<name name="is_key" arity="2"/>
 			<fsummary></fsummary>
 			<desc>
diff --git a/lib/stdlib/test/Makefile b/lib/stdlib/test/Makefile
index 39f6ce423a..a271229c59 100644
--- a/lib/stdlib/test/Makefile
+++ b/lib/stdlib/test/Makefile
@@ -85,7 +85,8 @@ MODULES= \
 	zip_SUITE \
 	random_unicode_list \
 	random_iolist \
-	error_logger_forwarder
+	error_logger_forwarder \
+	maps_SUITE
 
 ERL_FILES= $(MODULES:%=%.erl)
 
diff --git a/lib/stdlib/test/maps_SUITE.erl b/lib/stdlib/test/maps_SUITE.erl
new file mode 100644
index 0000000000..c826ee731a
--- /dev/null
+++ b/lib/stdlib/test/maps_SUITE.erl
@@ -0,0 +1,69 @@
+%%
+%% %CopyrightBegin%
+%%
+%% Copyright Ericsson AB 1997-2014. All Rights Reserved.
+%%
+%% The contents of this file are subject to the Erlang Public License,
+%% Version 1.1, (the "License"); you may not use this file except in
+%% compliance with the License. You should have received a copy of the
+%% Erlang Public License along with this software. If not, it can be
+%% retrieved online at http://www.erlang.org/.
+%%
+%% Software distributed under the License is distributed on an "AS IS"
+%% basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
+%% the License for the specific language governing rights and limitations
+%% under the License.
+%%
+%% %CopyrightEnd%
+%%
+%%%----------------------------------------------------------------
+%%% Purpose: Test suite for the 'maps' module.
+%%%-----------------------------------------------------------------
+
+-module(maps_SUITE).
+
+-include_lib("test_server/include/test_server.hrl").
+
+% Default timetrap timeout (set in init_per_testcase).
+% This should be set relatively high (10-15 times the expected
+% max testcasetime).
+-define(default_timeout, ?t:minutes(4)).
+
+% Test server specific exports
+-export([all/0]).
+-export([suite/0]).
+-export([init_per_suite/1]).
+-export([end_per_suite/1]).
+-export([init_per_testcase/2]).
+-export([end_per_testcase/2]).
+
+-export([get3/1]).
+
+suite() ->
+    [{ct_hooks, [ts_install_cth]}].
+
+all() ->
+    [get3].
+
+init_per_suite(Config) ->
+    Config.
+
+end_per_suite(_Config) ->
+    ok.
+
+init_per_testcase(_Case, Config) ->
+    ?line Dog=test_server:timetrap(?default_timeout),
+    [{watchdog, Dog}|Config].
+
+end_per_testcase(_Case, Config) ->
+    Dog=?config(watchdog, Config),
+    test_server:timetrap_cancel(Dog),
+    ok.
+
+get3(Config) when is_list(Config) ->
+    Map = #{ key1 => value1, key2 => value2 },
+    DefaultValue = "Default value",
+    ?line value1 = maps:get(key1, Map, DefaultValue),
+    ?line value2 = maps:get(key2, Map, DefaultValue),
+    ?line DefaultValue = maps:get(key3, Map, DefaultValue),
+    ok.