Test for some character literals

Like brackets, curly brackets, parens and comma. The previous tests only
checked them in total isolation. When inside a vector or before white
space, it didn't work.

test/clojure-mode-font-lock-test.el

@@ -942,6 +942,17 @@ DESCRIPTION is the description of the spec."
     ("\\ク"
      (1 2 clojure-character-face)))
 
+  (when-fontifying-it "should handle characters not by themselves"
+    ("[\\,,]"
+     (1 1 nil)
+     (2 3 clojure-character-face)
+     (4 5 nil))
+
+    ("[\\[]"
+     (1 1 nil)
+     (2 3 clojure-character-face)
+     (4 4 nil)))
+
   (when-fontifying-it "should handle referred vars"
     ("foo/var"
      (1 3 font-lock-type-face))