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"""Tests for coverage.templite."""
from coverage.templite import Templite
from tests.coveragetest import CoverageTest
# pylint: disable=W0612,E1101
# Disable W0612 (Unused variable) and
# E1101 (Instance of 'foo' has no 'bar' member)
class AnyOldObject(object):
"""Simple testing object.
Use keyword arguments in the constructor to set attributes on the object.
"""
def __init__(self, **attrs):
for n, v in attrs.items():
setattr(self, n, v)
class TempliteTest(CoverageTest):
"""Tests for Templite."""
run_in_temp_dir = False
def try_render(self, text, ctx, result):
"""Render `text` through `ctx`, and it had better be `result`."""
self.assertEqual(Templite(text).render(ctx), result)
def test_passthrough(self):
# Strings without variables are passed through unchanged.
self.assertEqual(Templite("Hello").render(), "Hello")
self.assertEqual(
Templite("Hello, 20% fun time!").render(),
"Hello, 20% fun time!"
)
def test_variables(self):
# Variables use {{var}} syntax.
self.try_render("Hello, {{name}}!", {'name':'Ned'}, "Hello, Ned!")
def test_undefined_variables(self):
# Using undefined names is an error.
self.assertRaises(
Exception,
self.try_render,
"Hi, {{name}}!", {}, "xyz"
)
def test_pipes(self):
# Variables can be filtered with pipes.
data = {
'name': 'Ned',
'upper': lambda x: x.upper(),
'second': lambda x: x[1],
}
self.try_render("Hello, {{name|upper}}!", data, "Hello, NED!")
# Pipes can be concatenated.
self.try_render("Hello, {{name|upper|second}}!", data, "Hello, E!")
def test_reusability(self):
# A single Templite can be used more than once with different data.
globs = {
'upper': lambda x: x.upper(),
'punct': '!',
}
template = Templite("This is {{name|upper}}{{punct}}", globs)
self.assertEqual(template.render({'name':'Ned'}), "This is NED!")
self.assertEqual(template.render({'name':'Ben'}), "This is BEN!")
def test_attribute(self):
# Variables' attributes can be accessed with dots.
obj = AnyOldObject(a="Ay")
self.try_render("{{obj.a}}", locals(), "Ay")
obj2 = AnyOldObject(obj=obj, b="Bee")
self.try_render("{{obj2.obj.a}} {{obj2.b}}", locals(), "Ay Bee")
def test_member_function(self):
# Variables' member functions can be used, as long as they are nullary.
class WithMemberFns(AnyOldObject):
"""A class to try out member function access."""
def ditto(self):
"""Return twice the .txt attribute."""
return self.txt + self.txt
obj = WithMemberFns(txt="Once")
self.try_render("{{obj.ditto}}", locals(), "OnceOnce")
def test_item_access(self):
# Variables' items can be used.
d = {'a':17, 'b':23}
self.try_render("{{d.a}} < {{d.b}}", locals(), "17 < 23")
def test_loops(self):
# Loops work like in Django.
nums = [1,2,3,4]
self.try_render(
"Look: {% for n in nums %}{{n}}, {% endfor %}done.",
locals(),
"Look: 1, 2, 3, 4, done."
)
# Loop iterables can be filtered.
def rev(l):
"""Return the reverse of `l`."""
l = l[:]
l.reverse()
return l
self.try_render(
"Look: {% for n in nums|rev %}{{n}}, {% endfor %}done.",
locals(),
"Look: 4, 3, 2, 1, done."
)
def test_empty_loops(self):
self.try_render(
"Empty: {% for n in nums %}{{n}}, {% endfor %}done.",
{'nums':[]},
"Empty: done."
)
def test_multiline_loops(self):
self.try_render(
"Look: \n{% for n in nums %}\n{{n}}, \n{% endfor %}done.",
{'nums':[1,2,3]},
"Look: \n\n1, \n\n2, \n\n3, \ndone."
)
def test_multiple_loops(self):
self.try_render(
"{% for n in nums %}{{n}}{% endfor %} and "
"{% for n in nums %}{{n}}{% endfor %}",
{'nums': [1,2,3]},
"123 and 123"
)
def test_comments(self):
# Single-line comments work:
self.try_render(
"Hello, {# Name goes here: #}{{name}}!",
{'name':'Ned'}, "Hello, Ned!"
)
# and so do multi-line comments:
self.try_render(
"Hello, {# Name\ngoes\nhere: #}{{name}}!",
{'name':'Ned'}, "Hello, Ned!"
)
def test_if(self):
self.try_render(
"Hi, {% if ned %}NED{% endif %}{% if ben %}BEN{% endif %}!",
{'ned': 1, 'ben': 0},
"Hi, NED!"
)
self.try_render(
"Hi, {% if ned %}NED{% endif %}{% if ben %}BEN{% endif %}!",
{'ned': 0, 'ben': 1},
"Hi, BEN!"
)
self.try_render(
"Hi, {% if ned %}NED{% if ben %}BEN{% endif %}{% endif %}!",
{'ned': 0, 'ben': 0},
"Hi, !"
)
self.try_render(
"Hi, {% if ned %}NED{% if ben %}BEN{% endif %}{% endif %}!",
{'ned': 1, 'ben': 0},
"Hi, NED!"
)
self.try_render(
"Hi, {% if ned %}NED{% if ben %}BEN{% endif %}{% endif %}!",
{'ned': 1, 'ben': 1},
"Hi, NEDBEN!"
)
def test_complex_if(self):
class Complex(AnyOldObject):
"""A class to try out complex data access."""
def getit(self):
"""Return it."""
return self.it
obj = Complex(it={'x':"Hello", 'y': 0})
self.try_render(
"@"
"{% if obj.getit.x %}X{% endif %}"
"{% if obj.getit.y %}Y{% endif %}"
"{% if obj.getit.y|str %}S{% endif %}"
"!",
{ 'obj': obj, 'str': str },
"@XS!"
)
def test_loop_if(self):
self.try_render(
"@{% for n in nums %}{% if n %}Z{% endif %}{{n}}{% endfor %}!",
{'nums': [0,1,2]},
"@0Z1Z2!"
)
self.try_render(
"X{%if nums%}@{% for n in nums %}{{n}}{% endfor %}{%endif%}!",
{'nums': [0,1,2]},
"X@012!"
)
self.try_render(
"X{%if nums%}@{% for n in nums %}{{n}}{% endfor %}{%endif%}!",
{'nums': []},
"X!"
)
def test_nested_loops(self):
self.try_render(
"@"
"{% for n in nums %}"
"{% for a in abc %}{{a}}{{n}}{% endfor %}"
"{% endfor %}"
"!",
{'nums': [0,1,2], 'abc': ['a', 'b', 'c']},
"@a0b0c0a1b1c1a2b2c2!"
)
def test_exception_during_evaluation(self):
# TypeError: Couldn't evaluate {{ foo.bar.baz }}:
# 'NoneType' object is unsubscriptable
self.assertRaises(TypeError, self.try_render,
"Hey {{foo.bar.baz}} there", {'foo': None}, "Hey ??? there"
)
def test_bogus_tag_syntax(self):
self.assertRaisesRegexp(
SyntaxError, "Don't understand tag: 'bogus'",
self.try_render,
"Huh: {% bogus %}!!{% endbogus %}??", {}, ""
)
def test_bad_nesting(self):
self.assertRaisesRegexp(
SyntaxError, "Unmatched action tag: 'if'",
self.try_render,
"{% if x %}X", {}, ""
)
self.assertRaisesRegexp(
SyntaxError, "Mismatched end tag: 'for'",
self.try_render,
"{% if x %}X{% endfor %}", {}, ""
)
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