Refs #28643 -- Added Replace database function.

1 files changed, 55 insertions, 0 deletions

diff --git a/tests/db_functions/test_replace.py b/tests/db_functions/test_replace.py
new file mode 100644
index 0000000000..91a1749d70
--- /dev/null
+++ b/tests/db_functions/test_replace.py
@@ -0,0 +1,55 @@
+from django.db.models import F, Value
+from django.db.models.functions import Concat, Replace
+from django.test import TestCase
+
+from .models import Author
+
+
+class ReplaceTests(TestCase):
+
+    @classmethod
+    def setUpTestData(cls):
+        Author.objects.create(name='George R. R. Martin')
+        Author.objects.create(name='J. R. R. Tolkien')
+
+    def test_replace_with_empty_string(self):
+        qs = Author.objects.annotate(
+            without_middlename=Replace(F('name'), Value('R. R. '), Value('')),
+        )
+        self.assertQuerysetEqual(qs, [
+            ('George R. R. Martin', 'George Martin'),
+            ('J. R. R. Tolkien', 'J. Tolkien'),
+        ], transform=lambda x: (x.name, x.without_middlename), ordered=False)
+
+    def test_case_sensitive(self):
+        qs = Author.objects.annotate(same_name=Replace(F('name'), Value('r. r.'), Value('')))
+        self.assertQuerysetEqual(qs, [
+            ('George R. R. Martin', 'George R. R. Martin'),
+            ('J. R. R. Tolkien', 'J. R. R. Tolkien'),
+        ], transform=lambda x: (x.name, x.same_name), ordered=False)
+
+    def test_replace_expression(self):
+        qs = Author.objects.annotate(same_name=Replace(
+            Concat(Value('Author: '), F('name')), Value('Author: '), Value('')),
+        )
+        self.assertQuerysetEqual(qs, [
+            ('George R. R. Martin', 'George R. R. Martin'),
+            ('J. R. R. Tolkien', 'J. R. R. Tolkien'),
+        ], transform=lambda x: (x.name, x.same_name), ordered=False)
+
+    def test_update(self):
+        Author.objects.update(
+            name=Replace(F('name'), Value('R. R. '), Value('')),
+        )
+        self.assertQuerysetEqual(Author.objects.all(), [
+            ('George Martin'),
+            ('J. Tolkien'),
+        ], transform=lambda x: x.name, ordered=False)
+
+    def test_replace_with_default_arg(self):
+        # The default replacement is an empty string.
+        qs = Author.objects.annotate(same_name=Replace(F('name'), Value('R. R. ')))
+        self.assertQuerysetEqual(qs, [
+            ('George R. R. Martin', 'George Martin'),
+            ('J. R. R. Tolkien', 'J. Tolkien'),
+        ], transform=lambda x: (x.name, x.same_name), ordered=False)