diff --git a/pyproject.toml b/pyproject.toml
index 52ebdaa..60d1a86 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -23,6 +23,13 @@ dependencies = [
   "httpx",
 ]
 
+[project.optional-dependencies]
+test = [
+  "pytest>=8.0",
+  "pytest-asyncio>=0.24",
+  "respx>=0.22",
+]
+
 [tool.setuptools]
 platforms = ["any"]
 zip-safe  = true
@@ -70,3 +77,5 @@ combine_as_imports = true
 
 [tool.pytest.ini_options]
 asyncio_mode = "auto"
+markers = ["integration: requires a real PrusaLink printer (skipped in CI)"]
+addopts = "-m 'not integration'"
diff --git a/tests/test_integration.py b/tests/test_integration.py
new file mode 100644
index 0000000..79441f2
--- /dev/null
+++ b/tests/test_integration.py
@@ -0,0 +1,62 @@
+"""Integration tests against a real PrusaLink printer.
+
+Run with:
+    PRUSALINK_HOST=http://prusa.lan \
+    PRUSALINK_USERNAME=maker \
+    PRUSALINK_PASSWORD=secret \
+    pytest tests/test_integration.py -v -s -m integration
+
+The `-m integration` flag is required to override the default
+`-m 'not integration'` from pyproject.toml. All tests are skipped
+when PRUSALINK_HOST is not set.
+"""
+
+import os
+
+import httpx
+from pyprusalink import PrusaLink
+import pytest
+
+pytestmark = pytest.mark.integration
+
+
+@pytest.fixture
+async def printer():
+    host = os.environ.get("PRUSALINK_HOST")
+    if not host:
+        pytest.skip("PRUSALINK_HOST not set")
+    username = os.environ.get("PRUSALINK_USERNAME", "maker")
+    password = os.environ.get("PRUSALINK_PASSWORD", "")
+    async with httpx.AsyncClient() as client:
+        yield PrusaLink(client, host, username, password)
+
+
+async def test_get_version(printer):
+    result = await printer.get_version()
+    assert "api" in result
+
+
+async def test_get_info(printer):
+    result = await printer.get_info()
+    assert "serial" in result
+    assert "nozzle_diameter" in result
+
+
+async def test_get_status(printer):
+    result = await printer.get_status()
+    assert "printer" in result
+    assert "state" in result["printer"]
+
+
+async def test_get_job(printer):
+    result = await printer.get_job()
+    # Returns empty dict when no job is running — both states are valid
+    assert isinstance(result, dict)
+    if result:
+        assert "id" in result
+        assert "state" in result
+
+
+async def test_get_legacy_printer(printer):
+    result = await printer.get_legacy_printer()
+    assert isinstance(result, dict)