Removed one more utils reference in the README and fixed directory name

Signed-off-by: Carlo Costino <carlo.costino@gsa.gov>

tests/notifications_utils/test_template_change.py

@@ -0,0 +1,135 @@
+import pytest
+
+from notifications_utils.template_change import TemplateChange
+
+from .test_base_template import ConcreteTemplate
+
+
+@pytest.mark.parametrize(
+    "old_template, new_template, should_differ",
+    [
+        (
+            ConcreteTemplate({"content": "((1)) ((2)) ((3))"}),
+            ConcreteTemplate({"content": "((1)) ((2)) ((3))"}),
+            False,
+        ),
+        (
+            ConcreteTemplate({"content": "((1)) ((2)) ((3))"}),
+            ConcreteTemplate({"content": "((3)) ((2)) ((1))"}),
+            False,
+        ),
+        (
+            ConcreteTemplate({"content": "((1)) ((2)) ((3))"}),
+            ConcreteTemplate({"content": "((1)) ((1)) ((2)) ((2)) ((3)) ((3))"}),
+            False,
+        ),
+        (
+            ConcreteTemplate({"content": "((1))"}),
+            ConcreteTemplate({"content": "((1)) ((2))"}),
+            True,
+        ),
+        (
+            ConcreteTemplate({"content": "((1)) ((2))"}),
+            ConcreteTemplate({"content": "((1))"}),
+            True,
+        ),
+        (
+            ConcreteTemplate({"content": "((a)) ((b))"}),
+            ConcreteTemplate({"content": "((A)) (( B_ ))"}),
+            False,
+        ),
+    ],
+)
+def test_checking_for_difference_between_templates(
+    old_template, new_template, should_differ
+):
+    assert (
+        TemplateChange(old_template, new_template).has_different_placeholders
+        == should_differ
+    )
+
+
+@pytest.mark.parametrize(
+    "old_template, new_template, placeholders_added",
+    [
+        (
+            ConcreteTemplate({"content": "((1)) ((2)) ((3))"}),
+            ConcreteTemplate({"content": "((1)) ((2)) ((3))"}),
+            set(),
+        ),
+        (
+            ConcreteTemplate({"content": "((1)) ((2)) ((3))"}),
+            ConcreteTemplate({"content": "((1)) ((1)) ((2)) ((2)) ((3)) ((3))"}),
+            set(),
+        ),
+        (
+            ConcreteTemplate({"content": "((1)) ((2)) ((3))"}),
+            ConcreteTemplate({"content": "((1))"}),
+            set(),
+        ),
+        (
+            ConcreteTemplate({"content": "((1))"}),
+            ConcreteTemplate({"content": "((1)) ((2)) ((3))"}),
+            set(["2", "3"]),
+        ),
+        (
+            ConcreteTemplate({"content": "((a))"}),
+            ConcreteTemplate({"content": "((A)) ((B)) ((C))"}),
+            set(["B", "C"]),
+        ),
+    ],
+)
+def test_placeholders_added(old_template, new_template, placeholders_added):
+    assert (
+        TemplateChange(old_template, new_template).placeholders_added
+        == placeholders_added
+    )
+
+
+@pytest.mark.parametrize(
+    "old_template, new_template, placeholders_removed",
+    [
+        (
+            ConcreteTemplate({"content": "((1)) ((2)) ((3))"}),
+            ConcreteTemplate({"content": "((1)) ((2)) ((3))"}),
+            set(),
+        ),
+        (
+            ConcreteTemplate({"content": "((1)) ((2)) ((3))"}),
+            ConcreteTemplate({"content": "((1)) ((1)) ((2)) ((2)) ((3)) ((3))"}),
+            set(),
+        ),
+        (
+            ConcreteTemplate({"content": "((1))"}),
+            ConcreteTemplate({"content": "((1)) ((2)) ((3))"}),
+            set(),
+        ),
+        (
+            ConcreteTemplate({"content": "((1)) ((2)) ((3))"}),
+            ConcreteTemplate({"content": "((1))"}),
+            set(["2", "3"]),
+        ),
+        (
+            ConcreteTemplate({"content": "((a)) ((b)) ((c))"}),
+            ConcreteTemplate({"content": "((A))"}),
+            set(["b", "c"]),
+        ),
+    ],
+)
+def test_placeholders_removed(old_template, new_template, placeholders_removed):
+    assert (
+        TemplateChange(old_template, new_template).placeholders_removed
+        == placeholders_removed
+    )
+
+
+def test_ordering_of_placeholders_is_preserved():
+    before = ConcreteTemplate({"content": "((dog)) ((cat)) ((rat))"})
+    after = ConcreteTemplate({"content": "((platypus)) ((echidna)) ((quokka))"})
+    change = TemplateChange(before, after)
+    assert change.placeholders_removed == ["dog", "cat", "rat"] == before.placeholders
+    assert (
+        change.placeholders_added
+        == ["platypus", "echidna", "quokka"]
+        == after.placeholders
+    )