diff --git a/tests/unit_tests/output_parsers/test_boolean_parser.py b/tests/unit_tests/output_parsers/test_boolean_parser.py
new file mode 100644
index 00000000..3daaf610
--- /dev/null
+++ b/tests/unit_tests/output_parsers/test_boolean_parser.py
@@ -0,0 +1,20 @@
+from langchain.output_parsers.boolean import BooleanOutputParser
+
+
+def test_boolean_output_parser_parse() -> None:
+    parser = BooleanOutputParser()
+
+    # Test valid input
+    result = parser.parse("YES")
+    assert result is True
+
+    # Test valid input
+    result = parser.parse("NO")
+    assert result is False
+
+    # Test invalid input
+    try:
+        parser.parse("INVALID")
+        assert False, "Should have raised ValueError"
+    except ValueError:
+        pass
diff --git a/tests/unit_tests/output_parsers/test_list_parser.py b/tests/unit_tests/output_parsers/test_list_parser.py
new file mode 100644
index 00000000..84be4db9
--- /dev/null
+++ b/tests/unit_tests/output_parsers/test_list_parser.py
@@ -0,0 +1,13 @@
+from langchain.output_parsers.list import CommaSeparatedListOutputParser
+
+
+def test_single_item() -> None:
+    """Test that a string with a single item is parsed to a list with that item."""
+    parser = CommaSeparatedListOutputParser()
+    assert parser.parse("foo") == ["foo"]
+
+
+def test_multiple_items() -> None:
+    """Test that a string with multiple comma-separated items is parsed to a list."""
+    parser = CommaSeparatedListOutputParser()
+    assert parser.parse("foo, bar, baz") == ["foo", "bar", "baz"]
diff --git a/tests/unit_tests/output_parsers/test_structured_parser.py b/tests/unit_tests/output_parsers/test_structured_parser.py
new file mode 100644
index 00000000..abf19a7c
--- /dev/null
+++ b/tests/unit_tests/output_parsers/test_structured_parser.py
@@ -0,0 +1,25 @@
+from langchain.output_parsers import ResponseSchema, StructuredOutputParser
+from langchain.schema import OutputParserException
+
+
+def test_parse() -> None:
+    response_schemas = [
+        ResponseSchema(name="name", description="desc"),
+        ResponseSchema(name="age", description="desc"),
+    ]
+    parser = StructuredOutputParser.from_response_schemas(response_schemas)
+
+    # Test valid JSON input
+    text = '```json\n{"name": "John", "age": 30}\n```'
+    expected_result = {"name": "John", "age": 30}
+    result = parser.parse(text)
+    assert result == expected_result, f"Expected {expected_result}, but got {result}"
+
+    # Test invalid JSON input
+    text = '```json\n{"name": "John"}\n```'
+    try:
+        parser.parse(text)
+    except OutputParserException:
+        pass  # Test passes if OutputParserException is raised
+    else:
+        assert False, f"Expected OutputParserException, but got {parser.parse(text)}"