bpo-33855: Minimally test all IDLE modules. (GH-7689)

Create a template for minimally testing a tkinter-using module by importing it and instantiating its class(es).  Add a test file for all non-startup IDLE modules.  Edit existing files and update coverage.  This is part 1 of 3, covering the 21 autocomplete to help modules and touching 33 idlelib files.
(cherry picked from commit ee5ef309c7e2daef1248730145408f700732c42e)

Co-authored-by: Terry Jan Reedy <tjreedy@udel.edu>

1 files changed, 57 insertions, 0 deletions

diff --git a/Lib/idlelib/idle_test/test_debugobj.py b/Lib/idlelib/idle_test/test_debugobj.py
new file mode 100644
index 0000000..131ce22
--- /dev/null
+++ b/Lib/idlelib/idle_test/test_debugobj.py
@@ -0,0 +1,57 @@
+"Test debugobj, coverage 40%."
+
+from idlelib import debugobj
+import unittest
+
+
+class ObjectTreeItemTest(unittest.TestCase):
+
+    def test_init(self):
+        ti = debugobj.ObjectTreeItem('label', 22)
+        self.assertEqual(ti.labeltext, 'label')
+        self.assertEqual(ti.object, 22)
+        self.assertEqual(ti.setfunction, None)
+
+
+class ClassTreeItemTest(unittest.TestCase):
+
+    def test_isexpandable(self):
+        ti = debugobj.ClassTreeItem('label', 0)
+        self.assertTrue(ti.IsExpandable())
+
+
+class AtomicObjectTreeItemTest(unittest.TestCase):
+
+    def test_isexpandable(self):
+        ti = debugobj.AtomicObjectTreeItem('label', 0)
+        self.assertFalse(ti.IsExpandable())
+
+
+class SequenceTreeItemTest(unittest.TestCase):
+
+    def test_isexpandable(self):
+        ti = debugobj.SequenceTreeItem('label', ())
+        self.assertFalse(ti.IsExpandable())
+        ti = debugobj.SequenceTreeItem('label', (1,))
+        self.assertTrue(ti.IsExpandable())
+
+    def test_keys(self):
+        ti = debugobj.SequenceTreeItem('label', 'abc')
+        self.assertEqual(list(ti.keys()), [0, 1, 2])
+
+
+class DictTreeItemTest(unittest.TestCase):
+
+    def test_isexpandable(self):
+        ti = debugobj.DictTreeItem('label', {})
+        self.assertFalse(ti.IsExpandable())
+        ti = debugobj.DictTreeItem('label', {1:1})
+        self.assertTrue(ti.IsExpandable())
+
+    def test_keys(self):
+        ti = debugobj.DictTreeItem('label', {1:1, 0:0, 2:2})
+        self.assertEqual(ti.keys(), [0, 1, 2])
+
+
+if __name__ == '__main__':
+    unittest.main(verbosity=2)