Added links (#406)

Added links into the plot.
When clicking on the plot on the main page a redirect is implemente the
the matching detailpage.

tests/ui/home_page_test.py

@@ -1,8 +1,10 @@
 """Test for the Home Page."""
 import datetime
 from collections.abc import Generator
+from typing import Any
 from unittest.mock import patch
 
+import dash
 import pandas as pd
 import pytest
 from sqlalchemy.orm import Session
@@ -205,3 +207,33 @@ def _set_session(full_db: Session) -> Generator[None, None, None]:
 def test_layout() -> None:
     """Checks if layout can be executed."""
     home.layout()
+
+
+@pytest.mark.usefixtures("_set_session")
+@pytest.mark.parametrize("empty", ["", None, {}])
+def test_redirect_empty(empty: Any) -> None:
+    """Tests the redirection on clicking on the plot with an empty argument."""
+    assert home.redirect(empty) == dash.no_update  # type: ignore
+
+
+def test_redirect_content_without_db() -> None:
+    """Tests the error when no SQL session is defined."""
+    with pytest.raises(ValueError, match="No SQL session defined."):
+        assert home.redirect({"empty": ""})
+
+
+@pytest.mark.usefixtures("_set_session")
+@pytest.mark.parametrize(
+    ("click_on", "redirect_to"),
+    [
+        (
+            {"text": "Some Company GmbH"},
+            "/unternehmensdetails/1",
+        ),
+        ({"text": "Max Mustermann"}, "/personendetails/1"),
+        ({"text": "I do not exist"}, dash.no_update),
+    ],
+)
+def test_redirect(click_on: dict, redirect_to: Any) -> None:
+    """Tests the redirection when clicking on a plot."""
+    assert home.redirect({"points": [click_on]}) == redirect_to