diff --git a/gitdiff/testdata/apply/file_text.src b/gitdiff/testdata/apply/file_text.src
--- a/gitdiff/testdata/apply/file_text.src
+++ b/gitdiff/testdata/apply/file_text.src
@@ -1,4 +1,4 @@
-this is line 1
+the first line is different
 this is line 2
 this is line 3
 this is line 4
@@ -17,10 +17,10 @@ this is line 16
 this is line 17
 this is line 18
 this is line 19
+this line offsets all the line numbers!
 this is line 20
 this is line 21
-this is line 22
-this is line 23
+until here, now we're back on track!
 this is line 24
 this is line 25
 this is line 26
@@ -53,10 +53,10 @@ this is line 52
 this is line 53
 this is line 54
 this is line 55
-this is line 56
-this is line 57
-this is line 58
-this is line 59
+once upon a time, a line
+  in a text
+    file
+  changed
 this is line 60
 this is line 61
 this is line 62
@@ -130,8 +130,8 @@ this is line 129
 this is line 130
 this is line 131
 this is line 132
-this is line 133
-this is line 134
+this line was bad and has been removed
+this line was REDACTED and has been REDACTED
 this is line 135
 this is line 136
 this is line 137
@@ -161,12 +161,7 @@ this is line 160
 this is line 161
 this is line 162
 this is line 163
-this is line 164
-this is line 165
-this is line 166
-this is line 167
-this is line 168
-this is line 169
+the number on the remaining lines is 5 ahead of their actual position in the file
 this is line 170
 this is line 171
 this is line 172