tests/owlinearprojection: Test on input dataset with NaN values

Orange/widgets/visualize/tests/test_owlinearprojection.py

@@ -1,10 +1,16 @@
 # Test methods with long descriptive names can omit docstrings
 # pylint: disable=missing-docstring
 import random
+import numpy as np
+
+from AnyQt.QtCore import Qt, QModelIndex, QAbstractItemModel
+from AnyQt.QtWidgets import QComboBox
+from AnyQt.QtTest import QTest
 
 from Orange.data import Table
 from Orange.widgets.visualize.owlinearprojection import OWLinearProjection
-from Orange.widgets.tests.base import WidgetTest, WidgetOutputsTestMixin
+from Orange.widgets.tests.base import WidgetTest, WidgetOutputsTestMixin, datasets
+from Orange.widgets.tests.utils import EventSpy, excepthook_catch, simulate
 
 
 class TestOWLinearProjection(WidgetTest, WidgetOutputsTestMixin):
@@ -17,7 +23,7 @@ def setUpClass(cls):
         cls.signal_data = cls.data
 
     def setUp(self):
-        self.widget = self.create_widget(OWLinearProjection)
+        self.widget = self.create_widget(OWLinearProjection)  # type: OWLinearProjection
 
     def _select_data(self):
         random.seed(42)
@@ -28,3 +34,45 @@ def _select_data(self):
     def test_no_data(self):
         """Check that the widget doesn't crash on empty data"""
         self.send_signal("Data", Table(Table("iris").domain))
+
+    def test_nan_plot(self):
+        data = datasets.data_1()
+        espy = EventSpy(self.widget, OWLinearProjection.ReplotRequest)
+        with excepthook_catch() as exclist:
+            self.send_signal("Data", data)
+            # ensure delayed replot request is processed
+            if not espy.events():
+                assert espy.wait(1000)
+
+        cb_color = self.widget.controls.color_index
+        cb_size = self.widget.controls.size_index
+        cb_shape = self.widget.controls.shape_index
+        cb_jitter = self.widget.controls.jitter_value
+
+        simulate.combobox_run_through_all(cb_color)
+        simulate.combobox_run_through_all(cb_size)
+        simulate.combobox_run_through_all(cb_shape)
+        with excepthook_catch():
+            simulate.combobox_activate_index(cb_jitter, 1, delay=1)
+
+        data = data.copy()
+        data.X[:, 0] = np.nan
+        data.Y[:] = np.nan
+
+        spy = EventSpy(self.widget, OWLinearProjection.ReplotRequest)
+        self.send_signal("Data", data)
+        self.send_signal("Data Subset", data[2:3])
+        if not spy.events():
+            assert spy.wait()
+
+        with excepthook_catch():
+            simulate.combobox_activate_item(cb_color, "X1")
+
+        with excepthook_catch():
+            simulate.combobox_activate_item(cb_size, "X1")
+
+        with excepthook_catch():
+            simulate.combobox_activate_item(cb_shape, "D")
+
+        with excepthook_catch():
+            simulate.combobox_activate_index(cb_jitter, 2, delay=1)