Add tests for reference parameters.

js/test_cases/reference_parameters/README.md

@@ -0,0 +1 @@
+Reference parameters are evaluated at the time of render, as opposed to direct parameters which are evaluated at the time of assignment.

js/test_cases/reference_parameters/input1.json

@@ -0,0 +1,15 @@
+{
+  "name": "Bob",
+  "people": [
+    {
+      "name": "Alice",
+      "petname": "rover"
+    }
+  ],
+  "truthy": "some truthy value",
+  "other_petname": [
+    {
+      "petname": "spot"
+    }
+  ]
+}

js/test_cases/reference_parameters/main.dust

@@ -0,0 +1,52 @@
+Hello {name}, nice {pet}{~n}
+{#people}
+    Hello {name}, nice {pet}{~n}
+{/people}
+{#people name="chris" pet="cat"}
+    Hello {name}, nice {pet}{~n}
+{/people}
+
+Reference Parameters{~n}
+===================={~n}
+{#people name="chris" pet="{petname}" petname="whiskers"}
+    Hello {name}, nice {pet}{~n}
+{/people}
+{#people}
+    {#truthy name="chris" pet="{petname}" petname="whiskers"}
+        Hello {name}, nice {pet}{~n}
+    {/truthy}
+{/people}
+{#people name="chris" pet="{petname}" petname="whiskers"}
+    {#other_petname}
+        Hello {name}, nice {pet}{~n}
+    {/other_petname}
+{/people}
+{! Can you have additional text in reference parameters, or just the reference !}
+{#people name="chris" pet="{petname}!" petname="whiskers"}
+    {#other_petname}
+        Hello {name}, nice {pet}{~n}
+    {/other_petname}
+{/people}
+{! Can you have filters !}
+{#people name="chris" pet="{petname|js}" petname="whiskers"}
+    {#other_petname}
+        Hello {name}, nice {pet}{~n}
+    {/other_petname}
+{/people}
+
+
+Direct Parameters{~n}
+================={~n}
+{#people name="chris" pet=petname petname="whiskers"}
+    Hello {name}, nice {pet}{~n}
+{/people}
+{#people}
+    {#truthy name="chris" pet=petname petname="whiskers"}
+        Hello {name}, nice {pet}{~n}
+    {/truthy}
+{/people}
+{#people name="chris" pet=petname petname="whiskers"}
+    {#other_petname}
+        Hello {name}, nice {pet}{~n}
+    {/other_petname}
+{/people}