Use lexical-binding in most src tests

* test/src/charset-tests.el:
* test/src/chartab-tests.el:
* test/src/cmds-tests.el:
* test/src/coding-tests.el (top-level)
(generate-ascii-file, generate-mostly-nonascii-file):
* test/src/doc-tests.el:
* test/src/floatfns-tests.el:
* test/src/font-tests.el:
* test/src/keymap-tests.el:
* test/src/process-tests.el (top-level)
(process-test-sentinel-wait-function-working-p)
(process-test-stderr-buffer, process-test-stderr-filter):
* test/src/textprop-tests.el:
* test/src/thread-tests.el:
* test/src/timefns-tests.el:
* test/src/undo-tests.el:
* test/src/xml-tests.el: Use lexical-binding.

1 files changed, 1 insertions, 1 deletions

diff --git a/test/src/floatfns-tests.el b/test/src/floatfns-tests.el
index c1c2c8996a7..8c56674d4fd 100644
--- a/test/src/floatfns-tests.el
+++ b/test/src/floatfns-tests.el
@@ -1,4 +1,4 @@
-;;; floatfns-tests.el --- tests for floating point operations
+;;; floatfns-tests.el --- tests for floating point operations -*- lexical-binding: t -*-
 
 ;; Copyright 2017-2020 Free Software Foundation, Inc.