Update.

test/yaml/comments.wren

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+// retoor <retoor@molodetz.nl>
+
+import "yaml" for Yaml
+
+var yaml = "
+# This is a comment
+name: test
+# Another comment
+value: 123
+"
+
+var data = Yaml.parse(yaml)
+System.print(data["name"]) // expect: test
+System.print(data["value"]) // expect: 123
+
+var inlineComment = "name: test # inline comment"
+var data2 = Yaml.parse(inlineComment)
+System.print(data2["name"]) // expect: test

test/yaml/complex.wren

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+// retoor <retoor@molodetz.nl>
+
+import "yaml" for Yaml
+
+var yaml = "
+sections:
+  - title: Getting Started
+    pages:
+      - file: index
+        title: Overview
+      - file: installation
+        title: Installation
+  - title: API Reference
+    pages:
+      - file: json
+        title: json
+"
+
+var nav = Yaml.parse(yaml)
+System.print(nav["sections"][0]["title"]) // expect: Getting Started
+System.print(nav["sections"][0]["pages"][0]["file"]) // expect: index
+System.print(nav["sections"][0]["pages"][0]["title"]) // expect: Overview
+System.print(nav["sections"][0]["pages"][1]["file"]) // expect: installation
+System.print(nav["sections"][1]["title"]) // expect: API Reference
+System.print(nav["sections"][1]["pages"][0]["file"]) // expect: json

test/yaml/error_invalid.wren

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+// retoor <retoor@molodetz.nl>
+
+import "yaml" for Yaml
+
+var empty = Yaml.parse("")
+System.print(empty) // expect: null
+
+var nullInput = Yaml.parse(null)
+System.print(nullInput) // expect: null
+
+var whitespace = Yaml.parse("   \n   \n   ")
+System.print(whitespace) // expect: null

test/yaml/lists.wren

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+// retoor <retoor@molodetz.nl>
+
+import "yaml" for Yaml
+
+var yaml = "items:\n  - first\n  - second\n  - third"
+var data = Yaml.parse(yaml)
+System.print(data["items"][0]) // expect: first
+System.print(data["items"][1]) // expect: second
+System.print(data["items"][2]) // expect: third
+System.print(data["items"].count) // expect: 3
+
+var simple = "- one\n- two\n- three"
+var list = Yaml.parse(simple)
+System.print(list[0]) // expect: one
+System.print(list[1]) // expect: two
+System.print(list.count) // expect: 3
+
+var numbers = "- 1\n- 2\n- 3"
+var numList = Yaml.parse(numbers)
+System.print(numList[0]) // expect: 1
+System.print(numList[1]) // expect: 2

test/yaml/nested.wren

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+// retoor <retoor@molodetz.nl>
+
+import "yaml" for Yaml
+
+var yaml = "server:\n  host: localhost\n  port: 8080"
+var config = Yaml.parse(yaml)
+System.print(config["server"]["host"]) // expect: localhost
+System.print(config["server"]["port"]) // expect: 8080
+
+var deep = "
+level1:
+  level2:
+    level3:
+      value: deep
+"
+var deepConfig = Yaml.parse(deep)
+System.print(deepConfig["level1"]["level2"]["level3"]["value"]) // expect: deep

test/yaml/parse.wren

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+// retoor <retoor@molodetz.nl>
+
+import "yaml" for Yaml
+
+var simple = Yaml.parse("name: test")
+System.print(simple["name"]) // expect: test
+
+var num = Yaml.parse("count: 42")
+System.print(num["count"]) // expect: 42
+
+var float = Yaml.parse("value: 3.14")
+System.print(float["value"]) // expect: 3.14
+
+var bool = Yaml.parse("active: true")
+System.print(bool["active"]) // expect: true
+
+var boolFalse = Yaml.parse("active: false")
+System.print(boolFalse["active"]) // expect: false
+
+var nullVal = Yaml.parse("value: null")
+System.print(nullVal["value"]) // expect: null
+
+var quoted = Yaml.parse("name: \"hello world\"")
+System.print(quoted["name"]) // expect: hello world
+
+var singleQuoted = Yaml.parse("name: 'hello world'")
+System.print(singleQuoted["name"]) // expect: hello world

test/yaml/stringify.wren

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+// retoor <retoor@molodetz.nl>
+
+import "yaml" for Yaml
+
+var simple = {"name": "test", "value": 42}
+var str = Yaml.stringify(simple)
+System.print(str.contains("name: test")) // expect: true
+System.print(str.contains("value: 42")) // expect: true
+
+var withList = {"items": ["one", "two", "three"]}
+var listStr = Yaml.stringify(withList)
+System.print(listStr.contains("items:")) // expect: true
+System.print(listStr.contains("- one")) // expect: true
+System.print(listStr.contains("- two")) // expect: true
+
+var nested = {"server": {"host": "localhost", "port": 8080}}
+var nestedStr = Yaml.stringify(nested)
+System.print(nestedStr.contains("server:")) // expect: true
+System.print(nestedStr.contains("host: localhost")) // expect: true
+
+System.print(Yaml.stringify(null)) // expect: null
+System.print(Yaml.stringify(true)) // expect: true
+System.print(Yaml.stringify(false)) // expect: false
+System.print(Yaml.stringify(42)) // expect: 42
+System.print(Yaml.stringify("hello")) // expect: hello