def test_to_value():
a = YTArray([1.0, 2.0, 3.0], "kpc")
assert_equal(a.to_value(), np.array([1.0, 2.0, 3.0]))
assert_equal(a.to_value(), a.value)
assert_equal(a.to_value("km"), a.in_units("km").value)
b = YTQuantity(5.5, "Msun")
assert_equal(b.to_value(), 5.5)
assert_equal(b.to_value("g"), b.in_units("g").value)
def test_display_ytarray():
arr = YTArray([1,2,3], 'cm')
widget = display_ytarray(arr)
dropdown = widget.children[-1]
dropdown.value = 'm'
# Check that our original array did *not* change
assert_equal(arr.to_value(), np.array([1.0, 2.0, 3.0]))
# Check our values did change
assert_equal([float(_.value) for _ in widget.children[:-1]],
arr.to_value()/100.0)
