2 files changed, 141 insertions, 0 deletions
diff --git a/test/snapshots/filewatch.golden b/test/snapshots/filewatch.golden
new file mode 100644
index 00000000..64c43c85
--- /dev/null
+++ b/test/snapshots/filewatch.golden
@@ -0,0 +1,93 @@
+== snap edited grid=150x30 cursor=15,2
+|Kill Newcol Tutor Debug NextColor Dump Find Grep Help
+|  NOR /tmp/pardes-snap/filewatch/cwd/w.txt Save De  NOR /tmp/pardes-snap/filewatch/cwd Del            NOR /tmp/pardes-snap/filewatch/cwd Del
+|     1 liMYEDITne 1
+|     2 line 2                                       w.txt                                             w.txt
+|     3 line 3
+|     4 line 4
+|     5 line 5
+|     6 line 6                                         w.txt
+|     7 line 7
+|     8 line 8
+|     9 line 9
+|    10 line 10
+|    11 line 11
+|    12 line 12
+|    13
+|
+|                                                    NOR /tmp/pardes-snap/filewatch/cwd Del
+|
+|                                                    w.txt
+|
+|
+|
+|
+|
+|
+|
+|
+|
+|
+|
+== snap reloaded grid=150x30 cursor=54,5
+|Kill Newcol Tutor Debug NextColor Dump Find Grep Help
+|  NOR /tmp/pardes-snap/filewatch/cwd/w.txt Save De  TTY /tmp/pardes-snap/filewatch/cwd Del            NOR /tmp/pardes-snap/filewatch/cwd Del
+|     1 EXTERNAL                                     $ ls
+|     2                                              w.txt                                             w.txt
+|                                                    $ echo EXTERN''AL > w.txt
+|                                                    $
+|
+|
+|
+|
+|
+|
+|
+|
+|
+|
+|                                                    NOR /tmp/pardes-snap/filewatch/cwd Del
+|
+|                                                    w.txt
+|
+|
+|
+|
+|
+|
+|
+|
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+|
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+== snap undone grid=150x30 cursor=15,2
+|Kill Newcol Tutor Debug NextColor Dump Find Grep Help
+|  NOR /tmp/pardes-snap/filewatch/cwd/w.txt Save De  TTY /tmp/pardes-snap/filewatch/cwd Del            NOR /tmp/pardes-snap/filewatch/cwd Del
+|     1 liMYEDITne 1                                 $ ls
+|     2 line 2                                       w.txt                                             w.txt
+|     3 line 3                                       $ echo EXTERN''AL > w.txt
+|     4 line 4                                       $
+|     5 line 5
+|     6 line 6
+|     7 line 7
+|     8 line 8
+|     9 line 9
+|    10 line 10
+|    11 line 11
+|    12 line 12
+|    13
+|
+|                                                    NOR /tmp/pardes-snap/filewatch/cwd Del
+|
+|                                                    w.txt
+|
+|
+|
+|
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diff --git a/test/snapshots/filewatch.snap b/test/snapshots/filewatch.snap
new file mode 100644
index 00000000..1ac8d081
--- /dev/null
+++ b/test/snapshots/filewatch.snap
@@ -0,0 +1,48 @@
+# external file updates: a write from outside pardes lands in the open pane,
+# and Undo brings the unsaved edit back. That is the whole contract — the
+# update is committed like any other edit, so nothing has to be merged.
+lines w.txt 12
+start 30 150 -n 3
+wait 8000 w.txt
+stable 700 20000
+# open w.txt as a file pane: type the name into the shell, right-click it
+press left 5 8
+release left 5 8
+stable 400 5000
+key i
+text w.txt
+key esc
+settle 100
+press right 6 8
+release right 6 8
+wait 10000 line 3
+stable 700 15000
+# an UNSAVED edit on line 1
+press left 10 3
+release left 10 3
+stable 400 5000
+key i
+text MYEDIT
+key esc
+settle 100
+stable 400 5000
+snap edited
+# overwrite the file from a shell in another column. The marker is split so
+# the ECHOED command line never matches the wait — only the reloaded pane does
+press left 60 5
+release left 60 5
+stable 400 5000
+key c-b
+stable 600 8000
+text echo EXTERN''AL > w.txt
+key enter
+wait 10000 EXTERNAL
+stable 700 10000
+snap reloaded
+# back in the file pane: one undo and the unsaved edit is there again
+press left 10 3
+release left 10 3
+stable 400 5000
+key u
+stable 400 5000
+snap undone