Fix issue #41

kattcmd/commands/__init__.py

 from . import init, template, open, root, test_download, config, compile, test, run, \
-    submit, clean, tips
+    submit, clean, tips, latest

kattcmd/core.py

@@ -40,7 +40,7 @@ def _ListBuiltins():
     return [commands.init, commands.template, commands.open, commands.root,
             commands.test_download, commands.config, commands.compile,
             commands.test, commands.run, commands.submit, commands.clean,
-            commands.tips]
+            commands.tips, commands.latest]
 
 
 def _ListExternals():

test/test_latest.py

+import os
+
+from .util import WithMostModules, WithCustomCWD, ExecuteInOrder
+
+@WithCustomCWD
+@WithMostModules
+def test_latest(bus):
+    home = os.environ['HOME']
+    problemname = 'carrots'
+    problemfolder = os.path.join(home, 'kattis', problemname)
+    calls = [
+        ('kattcmd:init', 'kattcmd:init:directory-created'),
+        ('kattcmd:open', 'kattcmd:open:problem-opened', [problemname]),
+        ('kattcmd:template:python', 'kattcmd:template:python-added', [problemfolder])
+    ]
+
+    assert all(checker.yay for _, checker in ExecuteInOrder(bus, calls))
+
+    result = bus.call('kattcmd:latest', bus, problemname)
+    assert len(result) == 2
+    type, items = result
+    assert type == 'python'
+    items = list(map(os.path.basename, items))
+    assert items == ['carrots.py']

test/util.py

@@ -3,7 +3,8 @@ import tempfile
 from kattcmd import core
 from kattcmd import bus as busmodule
 from kattcmd.commands import open as open_command, compile as compile_command, \
-    init, root, config, template, test_download, test, run, clean, submit
+    init, root, config, template, test_download, test, run, clean, submit, \
+    latest
 
 def WithCustomCWD(f):
     '''Descriptor for tests that should run in an isolated environment.'''
@@ -55,7 +56,7 @@ def WithModules(modulelist):
 def WithMostModules(f):
     return WithModules([
         init, root, config, template, test_download, open_command, compile_command, test,
-        run, clean, submit
+        run, clean, submit, latest
     ])(f)