From 7c6915da640e6d8c59e1c627644447978b0e3d3e Mon Sep 17 00:00:00 2001
From: Kaylin Yeoh <kaylin.yeoh_02@yahoo.com>
Date: Thu, 7 Dec 2023 18:56:03 -0500
Subject: [PATCH 1/2] added test cases for multiline string diffs

---
 testing/test_assertion.py | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

diff --git a/testing/test_assertion.py b/testing/test_assertion.py
index 7c8c01556..9ae04a9bf 100644
--- a/testing/test_assertion.py
+++ b/testing/test_assertion.py
@@ -395,6 +395,27 @@ class TestAssert_reprcompare:
             "- eggs",
             "+ spam",
         ]
+        
+    def test_multiline_diff(self) -> None:
+        m = [
+            "This is some dummy test which shows the strange way in which Pycharm"
+            " displays the full diff."
+        ]
+        assert callequal(m, []) == [
+            "['This is som...e full diff.'] == []",
+            "Left contains one more item: 'This is some dummy test which shows the "
+            "strange way in which Pycharm displays the full diff.'",
+            'Use -v to get more diff',
+        ]
+        assert callequal(m, [], verbose=True) == [
+            "['This is som...e full diff.'] == []",
+            "Left contains one more item: 'This is some dummy test which shows the "
+            "strange way in which Pycharm displays the full diff.'",
+            "Full diff:",
+            "- []",
+            "+ ['This is some dummy test which shows the strange way in which Pycharm "
+            "displays the full diff.']",
+        ]
 
     def test_text_skipping(self) -> None:
         lines = callequal("a" * 50 + "spam", "a" * 50 + "eggs")

From 7cab05fddadecf4608fd8478e52d4b30ec2e63e5 Mon Sep 17 00:00:00 2001
From: Kaylin Yeoh <kaylin.yeoh_02@yahoo.com>
Date: Thu, 7 Dec 2023 19:03:42 -0500
Subject: [PATCH 2/2] added documentation

---
 AUTHORS                    | 2 ++
 changelog/10863.bugfix.rst | 4 ++++
 2 files changed, 6 insertions(+)
 create mode 100644 changelog/10863.bugfix.rst

diff --git a/AUTHORS b/AUTHORS
index e30131d1a..731f3c92c 100644
--- a/AUTHORS
+++ b/AUTHORS
@@ -180,6 +180,7 @@ Jake VanderPlas
 Jakob van Santen
 Jakub Mitoraj
 James Bourbeau
+Jamie Chen
 Jan Balster
 Janne Vanhala
 Jason R. Coombs
@@ -205,6 +206,7 @@ Justice Ndou
 Justyna Janczyszyn
 Kale Kundert
 Kamran Ahmad
+Kaylin Yeoh
 Kenny Y
 Karl O. Pinc
 Karthikeyan Singaravelan
diff --git a/changelog/10863.bugfix.rst b/changelog/10863.bugfix.rst
new file mode 100644
index 000000000..60ac21559
--- /dev/null
+++ b/changelog/10863.bugfix.rst
@@ -0,0 +1,4 @@
+Found source causes multiline string diff error
+Added private functions to check specific cases
+Fixed output issue with implicit concatonated strings
+Added tests in test assertion file in function test_multiline_diff