Add tests that prove that the priority between explicit contexts and parameters varies across sections and partials.

js/test_cases/explicit_context_setting/README.md

@@ -1,3 +1,9 @@
+Priority
+--------
+Partials: Explicit context takes priority over parameters
+
+Sections: New context takes priority, then parameters, then explicit
+
 $idx and $len
 -------------
 
@@ -6,7 +12,7 @@ $idx and $len do not survive through an explicit context setting, which will wor
 You can use $idx and $len as your explicit context, but as scalar values I do not think there is a way to access them anyway.
 
 Exists and Not-Exists
-=====================
+---------------------
 
 Looks like you can exlicitly set a context with exists and not-exists tags too. This works out well in the parser because I am using the same code for those blocks.
 

js/test_cases/explicit_context_setting/input1.json

@@ -1,4 +1,9 @@
 {
+  "another_idx": {
+    "$idx": 21,
+    "$len": 22,
+    "other": 23
+  },
   "block": {
     "message": {
       "contents": "Explicit contexts are evaluated in the context of the block."
@@ -14,6 +19,9 @@
   "explicit": {
     "pet": "cat"
   },
+  "has_idx": {
+    "$idx": 14
+  },
   "inline_partial": {
     "message": {
       "contents": "Explicit contexts are evaluated in the context of the inline partial."

js/test_cases/explicit_context_setting/main.dust

@@ -296,3 +296,33 @@ Explicit Evaluation Time Split Partial Context OVerride{~n}
         {>explicit_evaluation_time_split_override/}
     {/inline_partial}
 {/partial_context}
+
+{! What happens with sections with explicit context and parameters !}
+Section set $idx as a parameter{~n}
+==============================={~n}
+{#explicit $idx="7"}
+    $idx is {$idx}{~n}
+    $len is {$len}{~n}
+{/explicit}
+
+Section set $idx as a parameter and new context{~n}
+==============================================={~n}
+{#has_idx $idx="7"}
+    $idx is {$idx}{~n}
+    $len is {$len}{~n}
+{/has_idx}
+
+Section set $idx as a parameter, new context, and explicit context{~n}
+=================================================================={~n}
+{#has_idx:another_idx $idx="7" $len="8"}
+    $idx is {$idx}{~n}
+    $len is {$len}{~n}
+    other is {other}{~n}
+{/has_idx}
+
+Section vs Partial priority{~n}
+==========================={~n}
+{#some_global:explicit pet="snake"}
+    {pet}{~n}
+{/some_global}
+{>priority:explicit pet="snake"/}

js/test_cases/explicit_context_setting/priority.dust

@@ -0,0 +1 @@
+{pet}{~n}