Update.

test/jinja/choice_loader.wren

@@ -0,0 +1,19 @@
+// retoor <retoor@molodetz.nl>
+
+import "jinja" for Environment, DictLoader, ChoiceLoader
+
+var loader1 = DictLoader.new({"a.html": "Template A"})
+var loader2 = DictLoader.new({"b.html": "Template B"})
+var choice = ChoiceLoader.new([loader1, loader2])
+
+System.print(choice.exists("a.html")) // expect: true
+System.print(choice.exists("b.html")) // expect: true
+System.print(choice.exists("c.html")) // expect: false
+System.print(choice.getSource("a.html")) // expect: Template A
+System.print(choice.getSource("b.html")) // expect: Template B
+
+var env = Environment.new(choice)
+var tplA = env.getTemplate("a.html")
+var tplB = env.getTemplate("b.html")
+System.print(tplA.render({})) // expect: Template A
+System.print(tplB.render({})) // expect: Template B