Unit test markup and fix all issues found

test/__init__.py

@@ -0,0 +1,5 @@
+from .test_markup import *
+
+__all__ = []
+
+__all__+= test_element_rendering.__all__

test/test_markup.py

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+import unittest
+
+from cheuph import AT
+
+__all__ = ["TestAttributedText"]
+
+class TestAttributedText(unittest.TestCase):
+
+    SAMPLE_STRINGS = [
+            "Hello world",
+            "\n",
+            "            ",
+            "multiline\nstring\nwith\nmultiple\nlines",
+    ]
+
+    def setUp(self):
+        self.text = AT("This is a sample string.")
+        self.text = self.text.set("attribute", "value", 5, 21)
+        self.text = self.text.set_at("attribute2", "value2", 13)
+
+    def test_equality_of_empty_text(self):
+        self.assertEqual(AT(), AT())
+
+    def test_string_to_AT_to_string(self):
+        for string in self.SAMPLE_STRINGS:
+            with self.subTest(string=repr(string)):
+                self.assertEqual(string, str(AT(string)))
+
+    def test_homomorphism_on_string_concatenation(self):
+        self.assertEqual("hello world", str(AT("hello") + AT(" world")))
+
+        result_1 = "".join(self.SAMPLE_STRINGS)
+        result_2 = AT().join(AT(string) for string in self.SAMPLE_STRINGS)
+        self.assertEqual(result_1, str(result_2))
+
+    def test_setting_and_getting_an_attribute(self):
+        # Lower and upper bounds
+
+        self.assertIsNone(self.text.get(4, "attribute"))
+        self.assertEqual("value", self.text.get(5, "attribute"))
+        self.assertEqual("value", self.text.get(20, "attribute"))
+        self.assertIsNone(self.text.get(21, "attribute"))
+
+        self.assertIsNone(self.text.get(12, "attribute2"))
+        self.assertEqual("value2", self.text.get(13, "attribute2"))
+        self.assertIsNone(self.text.get(14, "attribute2"))
+
+        # Variants on get()
+
+        self.assertEqual({"attribute": "value"}, self.text.at(10))
+        self.assertEqual("value", self.text.at(10).get("attribute"))
+        self.assertEqual("value", self.text.get(10, "attribute"))
+
+        self.assertEqual({}, self.text.at(2))
+        self.assertIsNone(self.text.get(2, "attribute"))
+
+
+        self.assertEqual({"attribute": "value", "attribute2": "value2"},
+                self.text.at(13))
+
+    def test_slicing_and_putting_back_together_with_attributes(self):
+        text2 = self.text[:4] + self.text[4:11] + self.text[11:22] + self.text[22:]
+        text3 = self.text[:-20] + self.text[-20:-4] + self.text[-4:]
+
+        self.assertEqual(self.text, text2)
+        self.assertEqual(self.text, text3)
+
+    def test_removing_attributes(self):
+        text = self.text.remove("attribute", 9, 15)
+
+        # Lower and upper bounds
+
+        self.assertEqual("value", text.get(8, "attribute"))
+        self.assertIsNone(text.get(9, "attribute"))
+        self.assertIsNone(text.get(14, "attribute"))
+        self.assertEqual("value", text.get(15, "attribute"))
+
+        # Other attribute wasn't touched
+
+        self.assertIsNone(text.get(12, "attribute2"))
+        self.assertEqual("value2", text.get(13, "attribute2"))
+        self.assertIsNone(text.get(14, "attribute2"))
+
+    def test_immutability(self):
+        text = self.text
+        text2 = text.remove("attribute", 10, 12)
+        text3 = text2.set("attribute", "bar", 10, 14)
+        text4 = text3.set_at("attribute", "xyz", 11)
+
+        for i in range(5, 21):
+            self.assertEqual("value", text.get(i, "attribute"))
+
+        for i in range(10, 12):
+            self.assertIsNone(text2.get(i, "attribute"))
+
+        for i in range(10, 14):
+            self.assertEqual("bar", text3.get(i, "attribute"))
+
+        self.assertEqual("xyz", text4.get(11, "attribute"))
+
+    def test_joining_with_attributes(self):
+        snippet1 = AT("hello", foo="bar")
+        snippet2 = AT("world", foo="qux")
+        space = AT(" ", space=True, foo="herbert")
+
+        text1 = snippet1 + space + snippet2
+        text2 = space.join([snippet1, snippet2])
+
+        self.assertEqual(text1, text2)
+
+    # TODO test find_all()
+    # TODO test split_by()
+    # TODO test __mul__()