diff --git a/tests/unit/test_config.py b/tests/unit/test_config.py
new file mode 100644
index 0000000..2bc4528
--- /dev/null
+++ b/tests/unit/test_config.py
@@ -0,0 +1,133 @@
+"""Tests for configuration loading."""
+
+import tempfile
+from pathlib import Path
+
+import pytest
+
+from depcheck.config import Config, load_config, should_ignore_package, should_ignore_file
+from depcheck.models import Severity
+
+
+class TestConfig:
+    """Tests for configuration."""
+
+    def test_default_config(self):
+        """Test default configuration values."""
+        config = Config()
+
+        assert config.ignore_patterns == []
+        assert config.ignore_packages == []
+        assert config.fail_level == Severity.MEDIUM
+        assert config.output_format == "terminal"
+        assert config.verbose is False
+        assert config.quiet is False
+        assert config.include_dev is True
+
+    def test_load_empty_yaml(self):
+        """Test loading empty YAML config."""
+        with tempfile.NamedTemporaryFile(mode="w", suffix=".yaml", delete=False) as f:
+            f.write("")
+            f.flush()
+
+            config = load_config(Path(f.name))
+
+        assert config.ignore_patterns == []
+
+    def test_load_config_with_ignore_patterns(self):
+        """Test loading config with ignore patterns."""
+        content = """
+ignore_patterns:
+  - \"test/\"
+  - \"example/\"
+"""
+        with tempfile.NamedTemporaryFile(mode="w", suffix=".yaml", delete=False) as f:
+            f.write(content)
+            f.flush()
+
+            config = load_config(Path(f.name))
+
+        assert len(config.ignore_patterns) == 2
+        assert "test/" in config.ignore_patterns
+
+    def test_load_config_with_fail_level(self):
+        """Test loading config with fail level."""
+        content = """
+fail_level: high
+"""
+        with tempfile.NamedTemporaryFile(mode="w", suffix=".yaml", delete=False) as f:
+            f.write(content)
+            f.flush()
+
+            config = load_config(Path(f.name))
+
+        assert config.fail_level == Severity.HIGH
+
+    def test_invalid_fail_level_uses_default(self):
+        """Test that invalid fail level uses default."""
+        content = """
+fail_level: invalid
+"""
+        with tempfile.NamedTemporaryFile(mode="w", suffix=".yaml", delete=False) as f:
+            f.write(content)
+            f.flush()
+
+            config = load_config(Path(f.name))
+
+        assert config.fail_level == Severity.MEDIUM
+
+    def test_load_config_with_output_settings(self):
+        """Test loading config with output settings."""
+        content = """
+output:
+  format: json
+  verbose: true
+  quiet: false
+"""
+        with tempfile.NamedTemporaryFile(mode="w", suffix=".yaml", delete=False) as f:
+            f.write(content)
+            f.flush()
+
+            config = load_config(Path(f.name))
+
+        assert config.output_format == "json"
+        assert config.verbose is True
+        assert config.quiet is False
+
+    def test_load_config_with_ignore_packages(self):
+        """Test loading config with ignored packages."""
+        content = """
+ignore_packages:
+  - \"@types/*\"
+  - \"*test*\"
+"""
+        with tempfile.NamedTemporaryFile(mode="w", suffix=".yaml", delete=False) as f:
+            f.write(content)
+            f.flush()
+
+            config = load_config(Path(f.name))
+
+        assert len(config.ignore_packages) == 2
+
+    def test_should_ignore_package(self):
+        """Test package ignore checking."""
+        config = Config(ignore_packages=["@types/*", "*test*"])
+
+        assert should_ignore_package(config, "@types/node") is True
+        assert should_ignore_package(config, "test-utils") is True
+        assert should_ignore_package(config, "express") is False
+
+    def test_should_ignore_file(self):
+        """Test file ignore checking."""
+        config = Config(ignore_patterns=["test/", "node_modules/"])
+
+        assert should_ignore_file(config, Path("/project/test/file.txt")) is True
+        assert should_ignore_file(config, Path("/project/node_modules/pkg/file.txt")) is True
+        assert should_ignore_file(config, Path("/project/src/file.txt")) is False
+
+    def test_missing_config_returns_defaults(self):
+        """Test that missing config file returns defaults."""
+        config = load_config(Path("/nonexistent/config.yaml"))
+
+        assert config.ignore_patterns == []
+        assert config.fail_level == Severity.MEDIUM