def test_add_css_class_when_defined_as_none():
div = html.Div(className=None)
assert div.className is None
# Add a class
add_css_class(div, "test-class1")
# Check class string
assert div.className == "test-class1"
def test_add_multi_class_list():
# Initialize className string with two classes and extraneous spaces
div = html.Div(className=" test-class1 test-class2 ")
# Add className string with extraneous space
add_css_class(div, ["test-class3 ", " test-class4 "])
# Check classes string
assert div.className == "test-class1 test-class2 test-class3 test-class4"
# Add it again and make sure nothing changed
add_css_class(div, ["test-class3", "test-class4"])
assert div.className == "test-class1 test-class2 test-class3 test-class4"
def test_add_css_class_when_multiple_already_defined():
# Initialize className string with two classes and extraneous spaces
div = html.Div(className=" test-class1 test-class2 ")
# Add className string with extraneous space
add_css_class(div, " test-class3 ")
# Check classes string
assert div.className == "test-class1 test-class2 test-class3"
# Add it again and make sure nothing changed
add_css_class(div, "test-class3")
assert div.className == "test-class1 test-class2 test-class3"
def test_add_css_class_when_undefined():
div = html.Div()
assert not hasattr(div, "className")
# Add a class
add_css_class(div, "test-class1")
# Check class string
assert div.className == "test-class1"
# Add it again and make sure nothing changed
add_css_class(div, "test-class1")
assert div.className == "test-class1"
def test_add_empty_string():
div = html.Div(className="test-class1 test-class2")
add_css_class(div, "")
assert div.className == "test-class1 test-class2"
def test_add_none():
div = html.Div(className="test-class1")
add_css_class(div, None)
assert div.className == "test-class1"
def test_add_empty_list():
div = html.Div(className="test-class1 test-class2")
add_css_class(div, [])
assert div.className == "test-class1 test-class2"