Add: Acceptance test for rendering quotes in mustache

Ref: https://dev.cfengine.com/issues/6516

tests/acceptance/10_files/templating/mustache_render_quote.cf

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+#######################################################
+#
+# Acceptance test to ensure that mustache renders quotes in variables
+# correctly.
+#
+# Redmine: https://dev.cfengine.com/issues/6516
+#######################################################
+
+body common control
+{
+      inputs => { "../../default.cf.sub" };
+      bundlesequence  => { default("$(this.promise_filename)") };
+      version => "1.0";
+
+}
+
+#######################################################
+
+bundle agent init
+{
+  vars:
+      "variable_containing_double_quote" string => 'Something "special" with quotes';
+      "variable_containing_single_quote" string => "Something 'special' with quotes";
+
+  files:
+      "$(G.testfile)"
+      delete => init_delete;
+}
+
+body delete init_delete
+{
+      dirlinks => "delete";
+      rmdirs   => "true";
+}
+
+#######################################################
+
+bundle agent test
+{
+  vars:
+      "template_file" string => "$(this.promise_filename).mustache";
+
+  files:
+      "$(G.testfile)"
+      create => "true",
+      edit_template => "$(template_file)",
+      template_method => "mustache";
+
+  reports:
+    DEBUG::
+      "Rendering template file $(template_file) to $(G.testfile)";
+}
+
+#######################################################
+
+bundle agent check
+{
+  vars:
+      "expect" string => readfile("$(this.promise_filename).expected", 4000);
+      "actual" string => readfile("$(G.testfile)", 4000);
+
+  classes:
+      "ok" expression => regcmp("$(expect)", "$(actual)");
+
+  reports:
+    DEBUG::
+      "expect: '$(expect)'";
+      "actual: '$(actual)'";
+    ok::
+      "$(this.promise_filename) Pass";
+    !ok::
+      "$(this.promise_filename) FAIL";
+}
+### PROJECT_ID: core
+### CATEGORY_ID: 27

tests/acceptance/10_files/templating/mustache_render_quote.cf.expected

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+Something "special" with quotes
+Something 'special' with quotes

tests/acceptance/10_files/templating/mustache_render_quote.cf.mustache

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+{{vars.init.variable_containing_double_quote}}
+{{vars.init.variable_containing_single_quote}}