diff --git a/tests/test_parser.py b/tests/test_parser.py
new file mode 100644
index 0000000..0c3df1a
--- /dev/null
+++ b/tests/test_parser.py
@@ -0,0 +1,140 @@
+"""Tests for the curl parser module."""
+
+import pytest
+from curlconverter.parser import parse_curl, ParsedCurl, tokenize_command
+
+
+class TestTokenizeCommand:
+    """Tests for tokenize_command function."""
+    
+    def test_simple_tokens(self):
+        """Test simple command tokenization."""
+        tokens = tokenize_command("curl -X POST https://example.com")
+        assert "curl" in tokens
+        assert "-X" in tokens
+        assert "POST" in tokens
+        assert "https://example.com" in tokens
+    
+    def test_quoted_strings(self):
+        """Test handling of quoted strings."""
+        tokens = tokenize_command('-H "Content-Type: application/json"')
+        assert '-H' in tokens
+        assert 'Content-Type: application/json' in tokens
+    
+    def test_single_quotes(self):
+        """Test handling of single quotes."""
+        tokens = tokenize_command("-d '{\"key\": \"value\"}'")
+        assert "-d" in tokens
+        assert '{"key": "value"}' in tokens
+
+
+class TestParseCurl:
+    """Tests for parse_curl function."""
+    
+    def test_basic_get_request(self):
+        """Test parsing a basic GET request."""
+        curl = "curl https://example.com"
+        result = parse_curl(curl)
+        assert result.url == "https://example.com"
+        assert result.method == "GET"
+    
+    def test_url_with_protocol(self):
+        """Test URL with http protocol."""
+        curl = "curl http://example.com"
+        result = parse_curl(curl)
+        assert result.url == "http://example.com"
+    
+    def test_post_request(self):
+        """Test parsing POST request with -X."""
+        curl = "curl -X POST https://api.example.com/users"
+        result = parse_curl(curl)
+        assert result.url == "https://api.example.com/users"
+        assert result.method == "POST"
+    
+    def test_post_with_data(self):
+        """Test parsing POST with -d flag."""
+        curl = "curl -d 'name=test' https://api.example.com/users"
+        result = parse_curl(curl)
+        assert result.method == "POST"
+        assert result.data == "name=test"
+    
+    def test_post_with_data_raw(self):
+        """Test parsing POST with --data-raw flag."""
+        curl = 'curl --data-raw {"name":"test"} https://api.example.com/users'
+        result = parse_curl(curl)
+        assert result.method == "POST"
+        assert result.data == '{name:test}'
+    
+    def test_headers(self):
+        """Test parsing headers."""
+        curl = 'curl -H "Content-Type: application/json" -H "Authorization: Bearer token" https://api.example.com'
+        result = parse_curl(curl)
+        assert "Content-Type" in result.headers
+        assert result.headers["Content-Type"] == "application/json"
+        assert "Authorization" in result.headers
+    
+    def test_basic_auth(self):
+        """Test parsing basic authentication."""
+        curl = "curl -u user:pass https://api.example.com"
+        result = parse_curl(curl)
+        assert result.auth == ("user", "pass")
+    
+    def test_cookies(self):
+        """Test parsing cookies."""
+        curl = "curl -b 'session=abc123' https://example.com"
+        result = parse_curl(curl)
+        assert result.cookies == "session=abc123"
+    
+    def test_user_agent(self):
+        """Test parsing user agent."""
+        curl = "curl -A 'Mozilla/5.0' https://example.com"
+        result = parse_curl(curl)
+        assert result.user_agent == "Mozilla/5.0"
+    
+    def test_full_command(self):
+        """Test parsing a complete curl command."""
+        curl = '''curl -X POST \
+            -H "Content-Type: application/json" \
+            -H "Authorization: Bearer token" \
+            -d '{\"name\":\"test\"}' \
+            -u user:pass \
+            -b "session=abc" \
+            https://api.example.com/users'''
+        result = parse_curl(curl)
+        assert result.url == "https://api.example.com/users"
+        assert result.method == "POST"
+        assert "Content-Type" in result.headers
+        assert result.data == '{"name":"test"}'
+        assert result.auth == ("user", "pass")
+        assert result.cookies == "session=abc"
+    
+    def test_empty_command_raises_error(self):
+        """Test that empty command raises ValueError."""
+        with pytest.raises(ValueError):
+            parse_curl("")
+    
+    def test_no_url_raises_error(self):
+        """Test that command without URL raises ValueError."""
+        with pytest.raises(ValueError):
+            parse_curl("curl -X POST")
+    
+    def test_curl_prefix_optional(self):
+        """Test that 'curl' prefix is optional."""
+        result = parse_curl("https://example.com")
+        assert result.url == "https://example.com"
+        assert result.method == "GET"
+
+
+class TestParsedCurl:
+    """Tests for ParsedCurl dataclass."""
+    
+    def test_default_values(self):
+        """Test default values."""
+        curl = ParsedCurl(url="https://example.com")
+        assert curl.url == "https://example.com"
+        assert curl.method == "GET"
+        assert curl.headers == {}
+        assert curl.data is None
+        assert curl.auth is None
+        assert curl.cookies is None
+        assert curl.user_agent is None