diff --git a/tests/test_printer_crud.py b/tests/test_printer_crud.py
new file mode 100644
index 0000000..20044bd
--- /dev/null
+++ b/tests/test_printer_crud.py
@@ -0,0 +1,207 @@
+"""Integration tests for printer and client CRUD endpoints."""
+import pytest
+from fastapi.testclient import TestClient
+
+
+# ---------------------------------------------------------------------------
+# Task 1: RED state — routes do not exist yet, tests should fail
+# ---------------------------------------------------------------------------
+
+
+def test_create_printer_persisted(client: TestClient) -> None:
+    """POST /printers with required fields returns 200; GET /printers contains printer name."""
+    from imptune.db.models import Printer
+
+    resp = client.post(
+        "/printers",
+        data={
+            "name": "Test Printer",
+            "ip_address": "192.168.1.100",
+            "port_name": "IP_192_168_1_100",
+        },
+    )
+    assert resp.status_code == 200
+
+    # GET /printers page contains the printer name
+    page = client.get("/printers")
+    assert page.status_code == 200
+    assert "Test Printer" in page.text
+
+    # Verify DB persistence
+    count = Printer.select().where(Printer.name == "Test Printer").count()
+    assert count == 1
+
+
+def test_create_printer_duplex(client: TestClient) -> None:
+    """POST /printers with duplex_mode=LongEdge persists correctly."""
+    from imptune.db.models import Printer
+
+    resp = client.post(
+        "/printers",
+        data={
+            "name": "Duplex Printer",
+            "ip_address": "192.168.1.101",
+            "port_name": "IP_192_168_1_101",
+            "duplex_mode": "LongEdge",
+        },
+    )
+    assert resp.status_code == 200
+
+    printer = Printer.get(Printer.name == "Duplex Printer")
+    assert printer.duplex_mode == "LongEdge"
+
+
+def test_create_printer_color_mode(client: TestClient) -> None:
+    """POST /printers with color_mode not sent (unchecked) sets color_mode=False."""
+    from imptune.db.models import Printer
+
+    resp = client.post(
+        "/printers",
+        data={
+            "name": "Mono Printer",
+            "ip_address": "192.168.1.102",
+            "port_name": "IP_192_168_1_102",
+            # color_mode intentionally omitted (unchecked checkbox)
+        },
+    )
+    assert resp.status_code == 200
+
+    printer = Printer.get(Printer.name == "Mono Printer")
+    assert printer.color_mode is False
+
+
+def test_create_printer_paper_size(client: TestClient) -> None:
+    """POST /printers with paper_size=Letter persists correctly."""
+    from imptune.db.models import Printer
+
+    resp = client.post(
+        "/printers",
+        data={
+            "name": "Letter Printer",
+            "ip_address": "192.168.1.103",
+            "port_name": "IP_192_168_1_103",
+            "paper_size": "Letter",
+        },
+    )
+    assert resp.status_code == 200
+
+    printer = Printer.get(Printer.name == "Letter Printer")
+    assert printer.paper_size == "Letter"
+
+
+def test_create_printer_collate(client: TestClient) -> None:
+    """POST /printers with collate not sent (unchecked) sets collate=False."""
+    from imptune.db.models import Printer
+
+    resp = client.post(
+        "/printers",
+        data={
+            "name": "No Collate Printer",
+            "ip_address": "192.168.1.104",
+            "port_name": "IP_192_168_1_104",
+            # collate intentionally omitted (unchecked checkbox)
+        },
+    )
+    assert resp.status_code == 200
+
+    printer = Printer.get(Printer.name == "No Collate Printer")
+    assert printer.collate is False
+
+
+def test_create_client(client: TestClient) -> None:
+    """POST /clients with name=Contoso returns 200; GET /clients contains Contoso."""
+    resp = client.post("/clients", data={"name": "Contoso"})
+    assert resp.status_code == 200
+
+    page = client.get("/clients")
+    assert page.status_code == 200
+    assert "Contoso" in page.text
+
+
+def test_printer_grouped_by_client(client: TestClient) -> None:
+    """Printer assigned to a client appears under that client group heading."""
+    from imptune.db.models import Client, Printer
+
+    # Create client
+    resp = client.post("/clients", data={"name": "Contoso"})
+    assert resp.status_code == 200
+
+    contoso = Client.get(Client.name == "Contoso")
+
+    # Create printer assigned to that client
+    resp = client.post(
+        "/printers",
+        data={
+            "name": "Contoso Printer",
+            "ip_address": "10.0.0.1",
+            "port_name": "IP_10_0_0_1",
+            "client_id": str(contoso.id),
+        },
+    )
+    assert resp.status_code == 200
+
+    # GET /printers should show "Contoso" as a group header
+    page = client.get("/printers")
+    assert page.status_code == 200
+    html = page.text
+    assert "Contoso" in html
+    # Client name should appear in a heading element
+    assert "<h3" in html
+
+
+def test_create_printer_missing_name(client: TestClient) -> None:
+    """POST /printers with empty name returns 400."""
+    resp = client.post(
+        "/printers",
+        data={
+            "name": "",
+            "ip_address": "192.168.1.100",
+            "port_name": "IP_192_168_1_100",
+        },
+    )
+    assert resp.status_code == 400
+
+
+def test_create_printer_invalid_ip(client: TestClient) -> None:
+    """POST /printers with empty ip_address returns 400."""
+    resp = client.post(
+        "/printers",
+        data={
+            "name": "Valid Name",
+            "ip_address": "",
+            "port_name": "SOME_PORT",
+        },
+    )
+    assert resp.status_code == 400
+
+
+def test_delete_printer(client: TestClient) -> None:
+    """DELETE /printers/{id} removes the printer; GET /printers no longer shows it."""
+    from imptune.db.models import Printer
+
+    # Create a printer
+    resp = client.post(
+        "/printers",
+        data={
+            "name": "To Delete",
+            "ip_address": "192.168.1.200",
+            "port_name": "IP_192_168_1_200",
+        },
+    )
+    assert resp.status_code == 200
+
+    # Find its ID
+    printer = Printer.get(Printer.name == "To Delete")
+    printer_id = printer.id
+
+    # Delete it
+    resp = client.delete(f"/printers/{printer_id}")
+    assert resp.status_code == 200
+
+    # Confirm it's gone from the DB
+    count = Printer.select().where(Printer.id == printer_id).count()
+    assert count == 0
+
+    # GET /printers should no longer show it
+    page = client.get("/printers")
+    assert "To Delete" not in page.text