added some smart completion tests

tests/test_smart_completion.py

@@ -0,0 +1,61 @@
+import pytest
+from prompt_toolkit.completion import Completion
+from prompt_toolkit.document import Document
+
+tables = {
+    'users': ['id', 'email', 'first_name', 'last_name'],
+    'orders': ['id', 'ordered_date', 'status']
+}
+
+@pytest.fixture
+def completer():
+
+    import pgcli.pgcompleter as pgcompleter
+    comp = pgcompleter.PGCompleter(smart_completion=True)
+    comp.extend_table_names(tables.keys())
+    for t in tables:
+        comp.extend_column_names(t, tables[t])
+    return comp
+
+@pytest.fixture
+def complete_event():
+    from mock import Mock
+    return Mock()
+
+def test_empty_string_completion(completer, complete_event):
+    text = ''
+    position = 0
+    result = set(
+        completer.get_completions(
+            Document(text=text, cursor_position=position),
+            complete_event))
+    assert set(map(Completion, completer.keywords)) == result
+
+def test_select_keyword_completion(completer, complete_event):
+    text = 'SEL'
+    position = len('SEL')
+    result = completer.get_completions(
+        Document(text=text, cursor_position=position),
+        complete_event)
+    assert set(result) == set([Completion(text='SELECT', start_position=-3)])
+
+def test_function_name_completion(completer, complete_event):
+    text = 'SELECT MA'
+    position = len('SELECT MA')
+    result = completer.get_completions(
+        Document(text=text, cursor_position=position),
+        complete_event)
+    assert set(result) == set([Completion(text='MAX', start_position=-2)])
+
+def test_suggested_column_names_in_function(completer, complete_event):
+    text = 'SELECT MAX( from users'
+    position = len('SELECT MAX(')
+    result = completer.get_completions(
+        Document(text=text, cursor_position=position),
+        complete_event)
+    assert set(result) == set([
+        Completion(text='*', start_position=0),
+        Completion(text='id', start_position=0),
+        Completion(text='email', start_position=0),
+        Completion(text='first_name', start_position=0),
+        Completion(text='last_name', start_position=0)])