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"""Tests for the type system."""
from __future__ import absolute_import
from __future__ import print_function
from __future__ import unicode_literals
from scss.types import Color, List, Null, Number, String
import pytest
# Operators: arithmetic (+ - * / %), unary (+ -), comparison (== != < > <= >=), boolean
# Types: numbers, colors, strings, booleans, lists
# Test them all!
def test_addition():
# Numbers are a little complicated, what with all the units
# Simple case
assert Number(123) + Number(456) == Number(579)
# Simple equal units
assert Number(1, "px") + Number(2, "px") == Number(3, "px")
# Unitless values inherit units of the other operand
assert Number(5) + Number(6, "px") == Number(11, "px")
# Zero values can cast to any units
assert Number(0, "in") + Number(24, "deg") == Number(24, "deg")
# With different units, the left operand wins
assert Number(10, "cm") + Number(100, "mm") == Number(20, "cm")
assert Number(100, "mm") + Number(10, "cm") == Number(200, "mm")
# Unconvertible units raise an error
with pytest.raises(ValueError):
Number(1, "px") + Number(1, "em")
# Adding anything to a string makes a string
assert Number(123) + String('abc') == String('123abc')
assert String('abc') + Number(123) == String('abc123')
ret = String('abc', quotes=None) + String('def', quotes=None)
assert ret == String('abcdef')
assert ret.quotes is None
ret = String('abc', quotes='"') + String('def', quotes=None)
assert ret == String('abcdef')
assert ret.quotes == '"'
ret = String('abc', quotes=None) + String('def', quotes='"')
assert ret == String('abcdef')
assert ret.quotes is None
assert Color.from_hex('#010305') + Color.from_hex('#050301') == Color.from_hex('#060606')
assert Color.from_name('white') + Color.from_name('white') == Color.from_name('white')
def test_subtraction():
assert Number(123) - Number(456) == Number(-333)
assert Number(456) - Number(123) == Number(333)
# TODO test that subtracting e.g. strings doesn't work
assert Color.from_hex('#0f0f0f') - Color.from_hex('#050505') == Color.from_hex('#0a0a0a')
def test_division():
assert Number(5, "px") / Number(5, "px") == Number(1)
assert Number(1, "in") / Number(6, "pt") == Number(12)
def test_comparison_numeric():
lo = Number(123)
hi = Number(456)
assert lo < hi
assert lo <= hi
assert lo <= lo
assert hi > lo
assert hi >= lo
assert hi >= hi
assert lo == lo
assert lo != hi
# Same tests, negated
assert not lo > hi
assert not lo >= hi
assert not hi < lo
assert not hi <= lo
assert not lo != lo
assert not lo == hi
# Numbers with units should also auto-cast numbers with units
units = Number(123, "px")
plain = Number(123)
assert units == plain
assert units <= plain
assert units >= plain
assert not units != plain
assert not units < plain
assert not units > plain
# Incompatible units have... rules.
ems = Number(100, "em")
pxs = Number(100, "px")
with pytest.raises(ValueError):
ems < pxs
with pytest.raises(ValueError):
ems > pxs
with pytest.raises(ValueError):
ems <= pxs
with pytest.raises(ValueError):
ems >= pxs
assert not ems == pxs
assert ems != pxs
def test_comparison_stringerific():
abc = String('abc')
xyz = String('xyz')
assert abc == abc
assert abc != xyz
assert not abc == xyz
assert not abc != abc
# Interaction with other types
assert Number(123) != String('123')
assert String('123') != Number(123)
# Sass strings don't support ordering
with pytest.raises(TypeError):
abc < xyz
with pytest.raises(TypeError):
abc <= xyz
with pytest.raises(TypeError):
abc > xyz
with pytest.raises(TypeError):
abc >= xyz
with pytest.raises(TypeError):
Number(123) < String('123')
def test_comparison_null():
null = Null()
assert null == null
assert null != Number(0)
with pytest.raises(TypeError):
null < null
def test_unrenderable():
# Empty lists can't be rendered as CSS
with pytest.raises(ValueError):
List([]).render()
# TODO write more! i'm lazy.
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