Issue 6853 - Add unit tests for quirks in snippet script parsing

test/snippets.js

Index: test/snippets.js
===================================================================
--- a/test/snippets.js
+++ b/test/snippets.js
@@ -183,16 +183,44 @@
                     [["foo"], ["bar", "1"]]);
   checkParsedScript("Script with blank argument in the middle", "foo '' Hello",
                     [["foo", "", "Hello"]]);
   checkParsedScript("Script with blank argument at the end", "foo Hello ''",
                     [["foo", "Hello", ""]]);
   checkParsedScript("Script with consecutive blank arguments", "foo '' ''",
                     [["foo", "", ""]]);
 
+  // Undocumented quirks (#6853).
+  checkParsedScript("Script with quotes within an argument", "foo Hello''world",
+                    [["foo", "Helloworld"]]);
+  checkParsedScript("Script with quotes within an argument containing whitespace",
+                    "foo Hello' 'world",
+                    [["foo", "Hello world"]]);
+  checkParsedScript("Script with quotes within an argument containing non-whitespace",
+                    "foo Hello','world",
+                    [["foo", "Hello,world"]]);
+  checkParsedScript("Script with quotes within an argument containing whitespace and non-whitespace",
+                    "foo Hello', 'world",
+                    [["foo", "Hello, world"]]);
+  checkParsedScript("Script with opening quote at the beginning of an argument",
+                    "foo 'Hello, 'world",
+                    [["foo", "Hello, world"]]);
+  checkParsedScript("Script with closing quote at the end of an argument",
+                    "foo Hello,' world'",
+                    [["foo", "Hello, world"]]);
+
+  checkParsedScript("Script with closing quote missing", "foo 'Hello, world",
+                    []);
+  checkParsedScript("Script with closing quote missing in last command",
+                    "foo Hello; bar 'How are you?",
+                    [["foo", "Hello"]]);
+  checkParsedScript("Script ending with a backslash",
+                    "foo Hello; bar 'How are you?' \\",
+                    [["foo", "Hello"]]);
+
   test.done();
 };
 
 exports.testScriptCompilation = function(test)
 {
   let libraries = [
     `
       let foo = 0;