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import pytest
from textual._node_list import NodeList
from textual.widget import Widget
def test_empty_list():
"""Does an empty node list report as being empty?"""
assert len(NodeList()) == 0
def test_add_one():
"""Does adding a node to the node list report as having one item?"""
nodes = NodeList()
nodes._append(Widget())
assert len(nodes) == 1
def test_length_hint():
"""Check length hint dunder method."""
nodes = NodeList()
assert nodes.__length_hint__() == 0
nodes._append(Widget())
nodes._append(Widget())
nodes._append(Widget())
assert nodes.__length_hint__() == 3
def test_repeat_add_one():
"""Does adding the same item to the node list ignore the additional adds?"""
nodes = NodeList()
widget = Widget()
for _ in range(1000):
nodes._append(widget)
assert len(nodes) == 1
def test_insert():
nodes = NodeList()
widget1 = Widget()
widget2 = Widget()
widget3 = Widget()
nodes._append(widget1)
nodes._append(widget3)
nodes._insert(1, widget2)
assert list(nodes) == [widget1, widget2, widget3]
def test_truthy():
"""Does a node list act as a truthy object?"""
nodes = NodeList()
assert not bool(nodes)
nodes._append(Widget())
assert bool(nodes)
def test_contains():
"""Can we check if a widget is (not) within the list?"""
widget = Widget()
nodes = NodeList()
assert widget not in nodes
nodes._append(widget)
assert widget in nodes
assert Widget() not in nodes
def test_index():
"""Can we get the index of a widget in the list?"""
widget = Widget()
nodes = NodeList()
with pytest.raises(ValueError):
_ = nodes.index(widget)
nodes._append(widget)
assert nodes.index(widget) == 0
def test_remove():
"""Can we remove a widget we've added?"""
widget = Widget()
nodes = NodeList()
nodes._append(widget)
assert widget in nodes
nodes._remove(widget)
assert widget not in nodes
def test_clear():
"""Can we clear the list?"""
nodes = NodeList()
assert len(nodes) == 0
widgets = [Widget() for _ in range(1000)]
for widget in widgets:
nodes._append(widget)
assert len(nodes) == 1000
for widget in widgets:
assert widget in nodes
nodes._clear()
assert len(nodes) == 0
for widget in widgets:
assert widget not in nodes
def test_listy():
nodes = NodeList()
widget1 = Widget()
widget2 = Widget()
nodes._append(widget1)
nodes._append(widget2)
assert list(nodes) == [widget1, widget2]
assert list(reversed(nodes)) == [widget2, widget1]
assert nodes[0] == widget1
assert nodes[1] == widget2
assert nodes[0:2] == [widget1, widget2]
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