--- a/tests/test-fix.t Fri Jul 06 16:45:44 2018 -0700
+++ b/tests/test-fix.t Fri Jul 06 12:47:02 2018 -0700
@@ -1027,3 +1027,29 @@
$ cd ..
+The --base flag affects the set of files being fixed. So while the --whole flag
+makes the base irrelevant for changed line ranges, it still changes the
+meaning and effect of the command. In this example, no files or lines are fixed
+until we specify the base, but then we do fix unchanged lines.
+
+ $ hg init basewhole
+ $ cd basewhole
+ $ printf "foo1\n" > foo.changed
+ $ hg commit -Aqm "first"
+ $ printf "foo2\n" >> foo.changed
+ $ printf "bar\n" > bar.changed
+ $ hg commit -Aqm "second"
+
+ $ hg fix --working-dir --whole
+ $ cat *.changed
+ bar
+ foo1
+ foo2
+
+ $ hg fix --working-dir --base 0 --whole
+ $ cat *.changed
+ BAR
+ FOO1
+ FOO2
+
+ $ cd ..