Added a new backend settings system

This can be used for saving runtime-configurable settings in the database.

tests_integration/tests/setting/test_set.py

@@ -0,0 +1,115 @@
+"""Integration tests for the Vendor API endpoint."""
+
+import json
+
+import httpx
+
+URL = "http://spoolman:8000"
+
+
+def test_set_currency():
+    """Test setting the currency setting."""
+    # Execute
+    result = httpx.post(
+        f"{URL}/api/v1/setting/currency",
+        json='"SEK"',
+    )
+    result.raise_for_status()
+
+    # Verify
+    setting = result.json()
+    assert setting == {
+        "value": '"SEK"',
+        "is_set": True,
+        "type": "string",
+    }
+
+    # Cleanup
+    result = httpx.post(
+        f"{URL}/api/v1/setting/currency",
+        json="",
+    )
+    result.raise_for_status()
+
+
+def test_unset_currency():
+    """Test un-setting the currency setting."""
+    # Execute set
+    result = httpx.post(
+        f"{URL}/api/v1/setting/currency",
+        json='"SEK"',
+    )
+    result.raise_for_status()
+
+    # Verify set
+    setting = result.json()
+    assert setting == {
+        "value": '"SEK"',
+        "is_set": True,
+        "type": "string",
+    }
+
+    # Execute unset
+    result = httpx.post(
+        f"{URL}/api/v1/setting/currency",
+        json="",
+    )
+    result.raise_for_status()
+
+    # Verify unset
+    setting = result.json()
+    assert setting == {
+        "value": '"EUR"',
+        "is_set": False,
+        "type": "string",
+    }
+
+
+def test_set_unknown():
+    """Test setting an invalid setting."""
+    # Execute
+    result = httpx.post(
+        f"{URL}/api/v1/setting/not-a-setting",
+        json='"SEK"',
+    )
+    assert result.status_code == 404
+
+
+def test_set_currency_wrong_type():
+    """Test setting the currency setting with the wrong type."""
+    # Execute
+    result = httpx.post(
+        f"{URL}/api/v1/setting/currency",
+        json=123,
+    )
+    assert result.status_code == 400
+
+
+def test_set_big_value():
+    """Test setting a setting to a long string which should be saved correctly."""
+    long_string = "a" * (2**16 - 1 - 2)  # Backend guarantees that it can handle strings up to 65535 characters long.
+    # Remove 2 characters to account for the quotes.
+
+    # Execute
+    result = httpx.post(
+        f"{URL}/api/v1/setting/currency",
+        json=json.dumps(long_string),
+    )
+    result.raise_for_status()
+
+    # Verify
+    result = httpx.get(f"{URL}/api/v1/setting/currency")
+    result.raise_for_status()
+    setting = result.json()
+    assert setting == {
+        "value": json.dumps(long_string),
+        "is_set": True,
+        "type": "string",
+    }
+
+    # Cleanup
+    result = httpx.post(
+        f"{URL}/api/v1/setting/currency",
+        json="",
+    )
+    result.raise_for_status()