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test_pipeline.py
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test_pipeline.py
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import param
import pytest
from packaging.version import Version
from panel.layout import Column, Row
from panel.pane import HoloViews
from panel.param import ParamMethod
from panel.pipeline import Pipeline, find_route
from panel.widgets import Button, Select
if Version(param.__version__) < Version('1.8.2'):
pytestmark = pytest.mark.skip("skipping if param version < 1.8.2", allow_module_level=True)
try:
import holoviews as hv
except Exception:
pytestmark = pytest.mark.skip('Pipeline requires HoloViews.')
class Stage1(param.Parameterized):
a = param.Number(default=5, bounds=(0, 10))
b = param.Number(default=5, bounds=(0, 10))
ready = param.Boolean(default=False)
next = param.String(default=None)
@param.output(c=param.Number)
def output(self):
return self.a * self.b
@param.depends('a', 'b')
def view(self):
return '%s * %s = %s' % (self.a, self.b, self.output())
def panel(self):
return Row(self.param, self.view)
class Stage2(param.Parameterized):
c = param.Number(default=5, precedence=-1, bounds=(0, None))
exp = param.Number(default=0.1, bounds=(0, 3))
@param.depends('c', 'exp')
def view(self):
return '%s^%s=%.3f' % (self.c, self.exp, self.c**self.exp)
def panel(self):
return Row(self.param, self.view)
class Stage2b(param.Parameterized):
c = param.Number(default=5, precedence=-1, bounds=(0, None))
root = param.Parameter(default=0.1)
@param.depends('c', 'root')
def view(self):
return '%s^-%s=%.3f' % (self.c, self.root, self.c**(-self.root))
def panel(self):
return Row(self.param, self.view)
class DummyStage(param.Parameterized):
def panel(self):
return 'foo'
def test_find_route():
graph = {'A': ('B', 'C'), 'C': ('D',), 'D': ('E', 'F', 'G'), 'F': ('H',), 'G': ('I',)}
assert find_route(graph, 'A', 'I') == ['C', 'D', 'G', 'I']
assert find_route(graph, 'B', 'I') is None
assert find_route(graph, 'D', 'H') == ['F', 'H']
def test_pipeline_from_classes():
pipeline = Pipeline([('Stage 1', Stage1), ('Stage 2', Stage2)])
layout = pipeline.layout
assert isinstance(layout, Column)
assert isinstance(layout[0], Row)
(title, error), progress, (prev_button, next_button) = layout[0].objects
assert isinstance(error, Row)
assert isinstance(prev_button, Button)
assert isinstance(next_button, Button)
assert isinstance(progress, HoloViews)
hv_obj = progress.object
graph = hv_obj.get(0)
assert isinstance(graph, hv.Graph)
assert len(graph) == 1
labels = hv_obj.get(1)
assert isinstance(labels, hv.Labels)
assert list(labels['Stage']) == ['Stage 1', 'Stage 2']
stage = layout[1][0]
assert isinstance(stage, Row)
assert isinstance(stage[1], ParamMethod)
assert stage[1].object() == '5 * 5 = 25'
pipeline.param.trigger('next')
stage = layout[1][0]
assert isinstance(stage, Row)
assert isinstance(stage[1], ParamMethod)
assert stage[1].object() == '25^0.1=1.380'
pipeline.param.trigger('previous')
stage = layout[1][0]
assert isinstance(stage, Row)
assert isinstance(stage[1], ParamMethod)
assert stage[1].object() == '5 * 5 = 25'
def test_pipeline_from_instances():
pipeline = Pipeline([('Stage 1', Stage1()), ('Stage 2', Stage2())])
layout = pipeline.layout
assert isinstance(layout, Column)
assert isinstance(layout[0], Row)
(title, error), progress, (prev_button, next_button) = layout[0].objects
assert isinstance(error, Row)
assert isinstance(prev_button, Button)
assert isinstance(next_button, Button)
assert isinstance(progress, HoloViews)
hv_obj = progress.object
graph = hv_obj.get(0)
assert isinstance(graph, hv.Graph)
assert len(graph) == 1
labels = hv_obj.get(1)
assert isinstance(labels, hv.Labels)
assert list(labels['Stage']) == ['Stage 1', 'Stage 2']
stage = layout[1][0]
assert isinstance(stage, Row)
assert isinstance(stage[1], ParamMethod)
assert stage[1].object() == '5 * 5 = 25'
pipeline.param.trigger('next')
stage = layout[1][0]
assert isinstance(stage, Row)
assert isinstance(stage[1], ParamMethod)
assert stage[1].object() == '25^0.1=1.380'
pipeline.param.trigger('previous')
stage = layout[1][0]
assert isinstance(stage, Row)
assert isinstance(stage[1], ParamMethod)
assert stage[1].object() == '5 * 5 = 25'
def test_pipeline_from_add_stages():
pipeline = Pipeline()
pipeline.add_stage('Stage 1', Stage1)
pipeline.add_stage('Stage 2', Stage2)
layout = pipeline.layout
assert isinstance(layout, Column)
assert isinstance(layout[0], Row)
(title, error), progress, (prev_button, next_button) = layout[0].objects
assert isinstance(error, Row)
assert isinstance(prev_button, Button)
assert isinstance(next_button, Button)
assert isinstance(progress, HoloViews)
hv_obj = progress.object
graph = hv_obj.get(0)
assert isinstance(graph, hv.Graph)
assert len(graph) == 1
labels = hv_obj.get(1)
assert isinstance(labels, hv.Labels)
assert list(labels['Stage']) == ['Stage 1', 'Stage 2']
stage = layout[1][0]
assert isinstance(stage, Row)
assert isinstance(stage[1], ParamMethod)
assert stage[1].object() == '5 * 5 = 25'
pipeline.param.trigger('next')
stage = layout[1][0]
assert isinstance(stage, Row)
assert isinstance(stage[1], ParamMethod)
assert stage[1].object() == '25^0.1=1.380'
pipeline.param.trigger('previous')
stage = layout[1][0]
assert isinstance(stage, Row)
assert isinstance(stage[1], ParamMethod)
assert stage[1].object() == '5 * 5 = 25'
def test_pipeline_define_graph_missing_node():
pipeline = Pipeline()
pipeline.add_stage('Stage 1', Stage1)
pipeline.add_stage('Stage 2', Stage2)
with pytest.raises(ValueError):
pipeline.define_graph({'Stage 1': ('Stage 2', 'Stage 2b')})
def test_pipeline_define_graph():
pipeline = Pipeline()
pipeline.add_stage('Stage 2', Stage2)
pipeline.add_stage('Stage 2b', Stage2b)
pipeline.add_stage('Stage 1', Stage1)
pipeline.define_graph({'Stage 1': ('Stage 2', 'Stage 2b')})
assert pipeline._stage == 'Stage 1'
assert isinstance(pipeline.buttons, Row)
(pselect, pbutton), (nselect, nbutton) = pipeline.buttons
assert isinstance(pselect, Select)
assert pselect.disabled
assert isinstance(pbutton, Button)
assert pbutton.disabled
assert isinstance(nselect, Select)
assert not nselect.disabled
assert nselect.options == ['Stage 2', 'Stage 2b']
assert nselect.value == 'Stage 2'
assert isinstance(nbutton, Button)
assert not nbutton.disabled
pipeline._next()
assert isinstance(pipeline._state, Stage2)
pipeline._previous()
nselect.value = 'Stage 2b'
pipeline._next()
assert isinstance(pipeline._state, Stage2b)
def test_pipeline_set_stage():
pipeline = Pipeline()
pipeline.add_stage('Stage 2', Stage2)
pipeline.add_stage('Stage 2b', Stage2b)
pipeline.add_stage('Stage 1', Stage1)
pipeline.add_stage('Final', DummyStage())
pipeline.define_graph({'Stage 1': ('Stage 2', 'Stage 2b'), 'Stage 2b': 'Final'})
pipeline._set_stage([2])
assert pipeline._stage == 'Stage 2'
pipeline._set_stage([0])
assert pipeline._stage == 'Stage 1'
pipeline._set_stage([3])
assert pipeline._stage == 'Final'
def test_pipeline_define_next_parameter_respected():
pipeline = Pipeline()
pipeline.add_stage('Stage 2', Stage2)
pipeline.add_stage('Stage 2b', Stage2b)
pipeline.add_stage('Stage 1', Stage1(next='Stage 2b'), next_parameter='next')
pipeline.define_graph({'Stage 1': ('Stage 2', 'Stage 2b')})
assert pipeline.next_selector.value == 'Stage 2b'
pipeline._state.next = 'Stage 2'
assert pipeline.next_selector.value == 'Stage 2'
def test_pipeline_error_condition():
pipeline = Pipeline()
stage2b = Stage2b(root='error')
pipeline.add_stage('Stage 2', Stage2)
pipeline.add_stage('Stage 2b', stage2b)
pipeline.add_stage('Stage 1', Stage1)
pipeline.define_graph({'Stage 1': ('Stage 2', 'Stage 2b')})
pipeline.next_selector.value = 'Stage 2b'
pipeline._next()
assert isinstance(pipeline.error[0], Button)
stage2b.root = 2
pipeline._next()
assert len(pipeline.error) == 0
def test_pipeline_previous_follows_initial_path():
pipeline = Pipeline()
pipeline.add_stage('Stage 1', Stage1)
pipeline.add_stage('Stage 2', Stage2)
pipeline.add_stage('Stage 2b', Stage2b)
pipeline.add_stage('Stage 3', DummyStage)
pipeline.define_graph({
'Stage 1': ('Stage 2', 'Stage 2b'),
'Stage 2': 'Stage 3',
'Stage 2b': 'Stage 3'
})
assert pipeline._route == ['Stage 1']
pipeline.next_selector.value = 'Stage 2b'
pipeline._next()
assert pipeline._route == ['Stage 1', 'Stage 2b']
pipeline._next()
assert pipeline._route == ['Stage 1', 'Stage 2b', 'Stage 3']
pipeline._previous()
assert pipeline._stage == 'Stage 2b'
assert pipeline._route == ['Stage 1', 'Stage 2b']
def test_pipeline_ready_respected():
pipeline = Pipeline(ready_parameter='ready')
pipeline.add_stage('Stage 1', Stage1)
pipeline.add_stage('Stage 2', Stage2)
assert pipeline.next_button.disabled
pipeline._state.ready = True
assert not pipeline.next_button.disabled
def test_pipeline_auto_advance_respected():
pipeline = Pipeline(ready_parameter='ready', auto_advance=True)
pipeline.add_stage('Stage 1', Stage1)
pipeline.add_stage('Stage 2', Stage2)
assert pipeline.next_button.disabled
pipeline._state.ready = True
assert isinstance(pipeline._state, Stage2)
def test_pipeline_network_diagram_states():
pipeline = Pipeline(ready_parameter='ready', auto_advance=True)
pipeline.add_stage('Stage 1', Stage1)
pipeline.add_stage('Stage 2', Stage2)
pipeline.add_stage('Stage 2b', Stage2b)
pipeline.define_graph({'Stage 1': ('Stage 2', 'Stage 2b')})
[s1, s2, s2b] = pipeline.network.object.get(0).nodes['State']
assert s1 == 'active'
assert s2 == 'inactive'
assert s2b == 'next'
pipeline._next()
[s1, s2, s2b] = pipeline.network.object.get(0).nodes['State']
assert s1 == 'inactive'
assert s2 == 'inactive'
assert s2b == 'active'
pipeline._previous()
[s1, s2, s2b] = pipeline.network.object.get(0).nodes['State']
assert s1 == 'active'
assert s2 == 'inactive'
assert s2b == 'next'
def test_pipeline_add_stage_validate_wrong_type():
pipeline = Pipeline()
with pytest.raises(ValueError):
pipeline.add_stage('Stage 1', 1)
def test_pipeline_add_stage_validate_add_twice():
pipeline = Pipeline()
pipeline.add_stage('Stage 1', Stage1)
with pytest.raises(ValueError):
pipeline.add_stage('Stage 1', Stage1)
def test_pipeline_getitem():
pipeline = Pipeline()
pipeline.add_stage('Stage 1', Stage1)
assert pipeline['Stage 1'] == Stage1
def test_pipeline_repr():
pipeline = Pipeline()
pipeline.add_stage('Stage 1', Stage1)
pipeline.add_stage('Stage 2', Stage2)
assert repr(pipeline) == 'Pipeline:\n [0] Stage 1: Stage1()\n [1] Stage 2: Stage2()'