diff --git a/tests/pricehist/sources/test_basesource.py b/tests/pricehist/sources/test_basesource.py
new file mode 100644
index 0000000..cfd5e80
--- /dev/null
+++ b/tests/pricehist/sources/test_basesource.py
@@ -0,0 +1,182 @@
+import logging
+
+import pytest
+
+from pricehist.series import Series
+from pricehist.sources.basesource import BaseSource
+
+
+class TestSource(BaseSource):
+    def id(self) -> str:
+        return ""
+
+    def name(self) -> str:
+        return ""
+
+    def description(self) -> str:
+        return ""
+
+    def source_url(self) -> str:
+        return ""
+
+    def start(self) -> str:
+        return ""
+
+    def types(self) -> list[str]:
+        return []
+
+    def notes(self) -> str:
+        return ""
+
+    def symbols(self) -> list[(str, str)]:
+        return []
+
+    def fetch(self, series: Series) -> Series:
+        pass
+
+
+@pytest.fixture
+def src():
+    return TestSource()
+
+
+def test_normalizesymbol_default_uppercase(src):
+    assert src.normalizesymbol("eur") == "EUR"
+
+
+def test_format_symbols_one(src, mocker):
+    src.symbols = mocker.MagicMock(return_value=[("A", "Description")])
+    assert src.format_symbols() == "A    Description\n"
+
+
+def test_format_symbols_many(src, mocker):
+    src.symbols = mocker.MagicMock(
+        return_value=[
+            ("A", "Description"),
+            ("BB", "Description longer"),
+            ("CCC", "Description longer again"),
+            ("DDDD", f"Description {'very '*15}long"),
+        ]
+    )
+    assert src.format_symbols() == (
+        "A       Description\n"
+        "BB      Description longer\n"
+        "CCC     Description longer again\n"
+        "DDDD    Description very very very very very very very very "
+        "very very very very very very very long\n"
+    )
+
+
+def test_format_search(src, mocker):
+    src.search = mocker.MagicMock(
+        return_value=[
+            ("A", "Description"),
+            ("BB", "Description longer"),
+            ("CCC", "Description longer again"),
+            ("DDDD", f"Description {'very '*15}long"),
+        ]
+    )
+    assert src.format_search("some query") == (
+        "A       Description\n"
+        "BB      Description longer\n"
+        "CCC     Description longer again\n"
+        "DDDD    Description very very very very very very very very "
+        "very very very very very very very long\n"
+    )
+
+
+def test_format_search_not_possible(src, mocker, caplog):
+    src.search = mocker.MagicMock(return_value=None)
+    with caplog.at_level(logging.INFO):
+        with pytest.raises(SystemExit) as e:
+            src.format_search("some query")
+    assert e.value.code == 1
+    r = caplog.records[0]
+    assert r.levelname == "ERROR"
+    assert "Symbol search is not possible for" in r.message
+
+
+def test_format_search_no_results(src, mocker, caplog):
+    src.search = mocker.MagicMock(return_value=[])
+    with caplog.at_level(logging.INFO):
+        results = src.format_search("some query")
+    r = caplog.records[0]
+    assert r.levelname == "INFO"
+    assert "No results found" in r.message
+    assert results == ""
+
+
+def test_format_info_skips_renderes_all_fields(src, mocker):
+    src.id = mocker.MagicMock(return_value="sourceid")
+    src.name = mocker.MagicMock(return_value="Source Name")
+    src.description = mocker.MagicMock(return_value="Source description.")
+    src.source_url = mocker.MagicMock(return_value="https://example.com/")
+    src.start = mocker.MagicMock(return_value="2021-01-01")
+    src.types = mocker.MagicMock(return_value=["open", "close"])
+    src.notes = mocker.MagicMock(return_value="Notes for user.")
+    output = src.format_info()
+    assert output == (
+        "ID          : sourceid\n"
+        "Name        : Source Name\n"
+        "Description : Source description.\n"
+        "URL         : https://example.com/\n"
+        "Start       : 2021-01-01\n"
+        "Types       : open, close\n"
+        "Notes       : Notes for user."
+    )
+
+
+def test_format_info_skips_empty_fields(src, mocker):
+    src.notes = mocker.MagicMock(return_value="")
+    output = src.format_info()
+    assert "Notes" not in output
+
+
+def test_format_info_wraps_long_values_with_indent(src, mocker):
+    notes = (
+        "Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do "
+        "eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim "
+        "ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut "
+        "aliquip ex ea commodo consequat."
+    )
+    src.notes = mocker.MagicMock(return_value=notes)
+    output = src.format_info(total_width=60)
+    assert output == (
+        "Notes       : Lorem ipsum dolor sit amet, consectetur\n"
+        "              adipiscing elit, sed do eiusmod tempor\n"
+        "              incididunt ut labore et dolore magna aliqua.\n"
+        "              Ut enim ad minim veniam, quis nostrud\n"
+        "              exercitation ullamco laboris nisi ut aliquip\n"
+        "              ex ea commodo consequat."
+    )
+
+
+def test_format_info_newline_handling(src, mocker):
+    notes = (
+        "Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do "
+        "eiusmod tempor incididunt ut labore.\n"
+        "Ut enim ad minim veniam.\n"
+        "\n"
+        "Quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea "
+        "commodo consequat."
+    )
+    src.notes = mocker.MagicMock(return_value=notes)
+    output = src.format_info(total_width=60)
+    assert output == (
+        "Notes       : Lorem ipsum dolor sit amet, consectetur\n"
+        "              adipiscing elit, sed do eiusmod tempor\n"
+        "              incididunt ut labore.\n"
+        "              Ut enim ad minim veniam.\n"
+        "\n"
+        "              Quis nostrud exercitation ullamco laboris nisi\n"
+        "              ut aliquip ex ea commodo consequat."
+    )
+
+
+def test_format_info_does_not_wrap_source_url(src, mocker):
+    url = "https://www.example.com/longlonglonglonglonglonglonglong/"
+    src.source_url = mocker.MagicMock(return_value=url)
+    output = src.format_info(total_width=60)
+    assert output == (
+        "URL         : https://www.example.com/longlonglonglonglonglonglonglong/"
+    )