diff --git a/tests/test_dataforge_parsers.py b/tests/test_dataforge_parsers.py
new file mode 100644
index 0000000..9035b6d
--- /dev/null
+++ b/tests/test_dataforge_parsers.py
@@ -0,0 +1,158 @@
+"""Tests for parsers module."""
+
+import json
+import os
+import tempfile
+
+import pytest
+import yaml
+
+from dataforge.parsers import (
+    detect_format,
+    detect_format_from_content,
+    load_data,
+    parse_content,
+    dump_data,
+    SUPPORTED_FORMATS,
+)
+
+
+FIXTURES_DIR = os.path.join(os.path.dirname(__file__), "dataforge_fixtures")
+
+
+class TestDetectFormat:
+    """Tests for format detection."""
+
+    def test_detect_json(self):
+        assert detect_format("test.json") == "json"
+
+    def test_detect_yaml(self):
+        assert detect_format("test.yaml") == "yaml"
+        assert detect_format("test.yml") == "yaml"
+
+    def test_detect_toml(self):
+        assert detect_format("test.toml") == "toml"
+
+    def test_detect_unsupported(self):
+        with pytest.raises(ValueError):
+            detect_format("test.txt")
+
+    def test_detect_case_insensitive(self):
+        assert detect_format("test.JSON") == "json"
+        assert detect_format("test.YAML") == "yaml"
+
+
+class TestDetectFormatFromContent:
+    """Tests for content-based format detection."""
+
+    def test_detect_json_object(self):
+        assert detect_format_from_content('{"name": "test"}') == "json"
+
+    def test_detect_json_array(self):
+        assert detect_format_from_content('[1, 2, 3]') == "json"
+
+    def test_detect_toml(self):
+        content = "key = 'value'\nname = 'test'"
+        assert detect_format_from_content(content) == "toml"
+
+    def test_detect_yaml(self):
+        content = "key: value\nname: test"
+        assert detect_format_from_content(content) == "yaml"
+
+
+class TestLoadData:
+    """Tests for loading data from files."""
+
+    def test_load_json_file(self):
+        data = load_data(os.path.join(FIXTURES_DIR, "sample.json"))
+        assert data["name"] == "test-project"
+        assert data["version"] == "1.0.0"
+
+    def test_load_yaml_file(self):
+        data = load_data(os.path.join(FIXTURES_DIR, "sample.yaml"))
+        assert data["name"] == "test-project"
+        assert data["version"] == "1.0.0"
+
+    def test_load_toml_file(self):
+        data = load_data(os.path.join(FIXTURES_DIR, "sample.toml"))
+        assert data["name"] == "test-project"
+        assert data["version"] == "1.0.0"
+
+    def test_load_json_string(self):
+        data = load_data('{"name": "test"}', format="json")
+        assert data["name"] == "test"
+
+    def test_load_yaml_string(self):
+        data = load_data("name: test\nvalue: 42", format="yaml")
+        assert data["name"] == "test"
+        assert data["value"] == 42
+
+
+class TestParseContent:
+    """Tests for parsing content strings."""
+
+    def test_parse_json(self):
+        data = parse_content('{"name": "test"}', "json")
+        assert data["name"] == "test"
+
+    def test_parse_yaml(self):
+        data = parse_content("name: test\nvalue: 42", "yaml")
+        assert data["name"] == "test"
+        assert data["value"] == 42
+
+    def test_parse_invalid_json(self):
+        with pytest.raises(json.JSONDecodeError):
+            parse_content("{invalid}", "json")
+
+    def test_parse_invalid_yaml(self):
+        with pytest.raises(yaml.YAMLError):
+            parse_content("invalid: yaml: content:", "yaml")
+
+
+class TestDumpData:
+    """Tests for dumping data to strings."""
+
+    def test_dump_json(self):
+        data = {"name": "test", "value": 42}
+        result = dump_data(data, "json")
+        parsed = json.loads(result)
+        assert parsed["name"] == "test"
+        assert parsed["value"] == 42
+
+    def test_dump_yaml(self):
+        data = {"name": "test", "value": 42}
+        result = dump_data(data, "yaml")
+        parsed = yaml.safe_load(result)
+        assert parsed["name"] == "test"
+        assert parsed["value"] == 42
+
+    def test_dump_compact_json(self):
+        data = {"name": "test"}
+        result = dump_data(data, "json", indent=None)
+        assert "\n" not in result
+
+    def test_dump_to_file(self):
+        data = {"name": "test"}
+        with tempfile.NamedTemporaryFile(mode="w", suffix=".json", delete=False) as f:
+            output_path = f.name
+        try:
+            dump_data(data, "json", output_path)
+            with open(output_path, "r") as f:
+                content = f.read()
+            parsed = json.loads(content)
+            assert parsed["name"] == "test"
+        finally:
+            os.unlink(output_path)
+
+
+class TestSupportedFormats:
+    """Tests for supported formats constant."""
+
+    def test_supported_formats_contains_json(self):
+        assert "json" in SUPPORTED_FORMATS
+
+    def test_supported_formats_contains_yaml(self):
+        assert "yaml" in SUPPORTED_FORMATS
+
+    def test_supported_formats_contains_toml(self):
+        assert "toml" in SUPPORTED_FORMATS