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

test/jinja/map_literal.wren

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+// retoor <retoor@molodetz.nl>
+
+import "jinja" for Environment, DictLoader
+
+var tpl1 = "{\x25 set data = {\"name\": \"Alice\", \"age\": 30} \x25}Name: {{ data.name }}, Age: {{ data.age }}"
+var tpl2 = "{\x25 set empty = {} \x25}Done"
+var tpl3 = "{\x25 set single = {\"key\": \"value\"} \x25}Key: {{ single.key }}"
+
+var loader = DictLoader.new({
+  "tpl1.html": tpl1,
+  "tpl2.html": tpl2,
+  "tpl3.html": tpl3
+})
+
+var env = Environment.new(loader)
+
+var result1 = env.getTemplate("tpl1.html").render({})
+System.print(result1) // expect: Name: Alice, Age: 30
+
+var result2 = env.getTemplate("tpl2.html").render({})
+System.print(result2) // expect: Done
+
+var result3 = env.getTemplate("tpl3.html").render({})
+System.print(result3) // expect: Key: value