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+Tests for vis specific editing features
+---------------------------------------
+
+The basic idea is to feed keyboard input to `vis` and compare the
+produced output with a known reference solution.
+
+A test constitutes of 3 files:
+
+ * `test.in` the file/buffer content with which the editor is started
+ * `test.keys` a file containing the keyboard input as would normally
+   be typed by a user
+ * `test.ref` a reference file at the end of the editing session
+
+The toplevel shell script `test.sh` looks for these files in sub
+directories, feeds the keys to `vis` and compares the produces output.
+
+Type `make` to run all tests.