Add test demonstrating that meta context variable overrides should be

scoped

Author: jasmith-hs

src/test/java/com/hubspot/jinjava/EagerTest.java

@@ -1669,4 +1669,13 @@ public void itHandlesDeferredContinueInForLoop() {
   public void itReconstructsFromedMacro() {
     expectedTemplateInterpreter.assertExpectedOutput("reconstructs-fromed-macro/test");
   }
+
+  @Test
+  public void itAllowsOverridingMetaContextVariableInChildScope() {
+    interpreter.getContext().addMetaContextVariables(Collections.singleton("meta"));
+    interpreter.getContext().put("meta", "META");
+    expectedTemplateInterpreter.assertExpectedOutputNonIdempotent(
+      "allows-overriding-meta-context-variable-in-child-scope/test"
+    );
+  }
 }

src/test/resources/eager/allows-overriding-meta-context-variable-in-child-scope/test.expected.jinja

@@ -0,0 +1,11 @@
+META
+{% set meta = 'META' %}\
+{% for __ignored__ in [0] %}
+  {% if deferred %}
+    {% set meta = 'new meta' %}
+    new meta
+  {% else %}
+    No op
+  {% endif %}
+{% endfor %}
+META

src/test/resources/eager/allows-overriding-meta-context-variable-in-child-scope/test.jinja

@@ -0,0 +1,10 @@
+{{ meta }}
+{% for i in range (1) %}
+  {% if deferred %}
+    {% set meta = 'new meta' %}
+    {{ meta }}
+  {% else %}
+    No op
+  {% endif %}
+{% endfor %}
+{{ meta }}