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# coding: utf-8
"""
Unit tests of context.py.
"""
from datetime import datetime
import unittest
from pystache.context import _NOT_FOUND
from pystache.context import _get_value
from pystache.context import Context
from tests.common import AssertIsMixin
class SimpleObject(object):
"""A sample class that does not define __getitem__()."""
def __init__(self):
self.foo = "bar"
def foo_callable(self):
return "called..."
class DictLike(object):
"""A sample class that implements __getitem__() and __contains__()."""
def __init__(self):
self._dict = {'foo': 'bar'}
self.fuzz = 'buzz'
def __contains__(self, key):
return key in self._dict
def __getitem__(self, key):
return self._dict[key]
class GetValueTests(unittest.TestCase, AssertIsMixin):
"""Test context._get_value()."""
def assertNotFound(self, item, key):
"""
Assert that a call to _get_value() returns _NOT_FOUND.
"""
self.assertIs(_get_value(item, key), _NOT_FOUND)
### Case: the item is a dictionary.
def test_dictionary__key_present(self):
"""
Test getting a key from a dictionary.
"""
item = {"foo": "bar"}
self.assertEquals(_get_value(item, "foo"), "bar")
def test_dictionary__callable_not_called(self):
"""
Test that callable values are returned as-is (and in particular not called).
"""
def foo_callable(self):
return "bar"
item = {"foo": foo_callable}
self.assertNotEquals(_get_value(item, "foo"), "bar")
self.assertTrue(_get_value(item, "foo") is foo_callable)
def test_dictionary__key_missing(self):
"""
Test getting a missing key from a dictionary.
"""
item = {}
self.assertNotFound(item, "missing")
def test_dictionary__attributes_not_checked(self):
"""
Test that dictionary attributes are not checked.
"""
item = {}
attr_name = "keys"
self.assertEquals(getattr(item, attr_name)(), [])
self.assertNotFound(item, attr_name)
def test_dictionary__dict_subclass(self):
"""
Test that subclasses of dict are treated as dictionaries.
"""
class DictSubclass(dict): pass
item = DictSubclass()
item["foo"] = "bar"
self.assertEquals(_get_value(item, "foo"), "bar")
### Case: the item is an object.
def test_object__attribute_present(self):
"""
Test getting an attribute from an object.
"""
item = SimpleObject()
self.assertEquals(_get_value(item, "foo"), "bar")
def test_object__attribute_missing(self):
"""
Test getting a missing attribute from an object.
"""
item = SimpleObject()
self.assertNotFound(item, "missing")
def test_object__attribute_is_callable(self):
"""
Test getting a callable attribute from an object.
"""
item = SimpleObject()
self.assertEquals(_get_value(item, "foo_callable"), "called...")
def test_object__non_built_in_type(self):
"""
Test getting an attribute from an instance of a type that isn't built-in.
"""
item = datetime(2012, 1, 2)
self.assertEquals(_get_value(item, "day"), 2)
def test_object__dict_like(self):
"""
Test getting a key from a dict-like object (an object that implements '__getitem__').
"""
item = DictLike()
self.assertEquals(item["foo"], "bar")
self.assertNotFound(item, "foo")
### Case: the item is an instance of a built-in type.
def test_built_in_type__integer(self):
"""
Test getting from an integer.
"""
class MyInt(int): pass
item1 = MyInt(10)
item2 = 10
self.assertEquals(item1.real, 10)
self.assertEquals(item2.real, 10)
self.assertEquals(_get_value(item1, 'real'), 10)
self.assertNotFound(item2, 'real')
def test_built_in_type__string(self):
"""
Test getting from a string.
"""
class MyStr(str): pass
item1 = MyStr('abc')
item2 = 'abc'
self.assertEquals(item1.upper(), 'ABC')
self.assertEquals(item2.upper(), 'ABC')
self.assertEquals(_get_value(item1, 'upper'), 'ABC')
self.assertNotFound(item2, 'upper')
def test_built_in_type__list(self):
"""
Test getting from a list.
"""
class MyList(list): pass
item1 = MyList([1, 2, 3])
item2 = [1, 2, 3]
self.assertEquals(item1.pop(), 3)
self.assertEquals(item2.pop(), 3)
self.assertEquals(_get_value(item1, 'pop'), 2)
self.assertNotFound(item2, 'pop')
class ContextTests(unittest.TestCase, AssertIsMixin):
"""
Test the Context class.
"""
def test_init__no_elements(self):
"""
Check that passing nothing to __init__() raises no exception.
"""
context = Context()
def test_init__many_elements(self):
"""
Check that passing more than two items to __init__() raises no exception.
"""
context = Context({}, {}, {})
def test__repr(self):
context = Context()
self.assertEquals(repr(context), 'Context()')
context = Context({'foo': 'bar'})
self.assertEquals(repr(context), "Context({'foo': 'bar'},)")
context = Context({'foo': 'bar'}, {'abc': 123})
self.assertEquals(repr(context), "Context({'foo': 'bar'}, {'abc': 123})")
def test__str(self):
context = Context()
self.assertEquals(str(context), 'Context()')
context = Context({'foo': 'bar'})
self.assertEquals(str(context), "Context({'foo': 'bar'},)")
context = Context({'foo': 'bar'}, {'abc': 123})
self.assertEquals(str(context), "Context({'foo': 'bar'}, {'abc': 123})")
## Test the static create() method.
def test_create__dictionary(self):
"""
Test passing a dictionary.
"""
context = Context.create({'foo': 'bar'})
self.assertEquals(context.get('foo'), 'bar')
def test_create__none(self):
"""
Test passing None.
"""
context = Context.create({'foo': 'bar'}, None)
self.assertEquals(context.get('foo'), 'bar')
def test_create__object(self):
"""
Test passing an object.
"""
class Foo(object):
foo = 'bar'
context = Context.create(Foo())
self.assertEquals(context.get('foo'), 'bar')
def test_create__context(self):
"""
Test passing a Context instance.
"""
obj = Context({'foo': 'bar'})
context = Context.create(obj)
self.assertEquals(context.get('foo'), 'bar')
def test_create__kwarg(self):
"""
Test passing a keyword argument.
"""
context = Context.create(foo='bar')
self.assertEquals(context.get('foo'), 'bar')
def test_create__precedence_positional(self):
"""
Test precedence of positional arguments.
"""
context = Context.create({'foo': 'bar'}, {'foo': 'buzz'})
self.assertEquals(context.get('foo'), 'buzz')
def test_create__precedence_keyword(self):
"""
Test precedence of keyword arguments.
"""
context = Context.create({'foo': 'bar'}, foo='buzz')
self.assertEquals(context.get('foo'), 'buzz')
def test_get__key_present(self):
"""
Test getting a key.
"""
context = Context({"foo": "bar"})
self.assertEquals(context.get("foo"), "bar")
def test_get__key_missing(self):
"""
Test getting a missing key.
"""
context = Context()
self.assertTrue(context.get("foo") is None)
def test_get__default(self):
"""
Test that get() respects the default value.
"""
context = Context()
self.assertEquals(context.get("foo", "bar"), "bar")
def test_get__precedence(self):
"""
Test that get() respects the order of precedence (later items first).
"""
context = Context({"foo": "bar"}, {"foo": "buzz"})
self.assertEquals(context.get("foo"), "buzz")
def test_get__fallback(self):
"""
Check that first-added stack items are queried on context misses.
"""
context = Context({"fuzz": "buzz"}, {"foo": "bar"})
self.assertEquals(context.get("fuzz"), "buzz")
def test_push(self):
"""
Test push().
"""
key = "foo"
context = Context({key: "bar"})
self.assertEquals(context.get(key), "bar")
context.push({key: "buzz"})
self.assertEquals(context.get(key), "buzz")
def test_pop(self):
"""
Test pop().
"""
key = "foo"
context = Context({key: "bar"}, {key: "buzz"})
self.assertEquals(context.get(key), "buzz")
item = context.pop()
self.assertEquals(item, {"foo": "buzz"})
self.assertEquals(context.get(key), "bar")
def test_top(self):
key = "foo"
context = Context({key: "bar"}, {key: "buzz"})
self.assertEquals(context.get(key), "buzz")
top = context.top()
self.assertEquals(top, {"foo": "buzz"})
# Make sure calling top() didn't remove the item from the stack.
self.assertEquals(context.get(key), "buzz")
def test_copy(self):
key = "foo"
original = Context({key: "bar"}, {key: "buzz"})
self.assertEquals(original.get(key), "buzz")
new = original.copy()
# Confirm that the copy behaves the same.
self.assertEquals(new.get(key), "buzz")
# Change the copy, and confirm it is changed.
new.pop()
self.assertEquals(new.get(key), "bar")
# Confirm the original is unchanged.
self.assertEquals(original.get(key), "buzz")
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