Test formatting of list of sources.

tests/pricehist/test_sources.py

@@ -0,0 +1,16 @@
+import re
+
+from pricehist import sources
+
+
+def test_formatted_includes_ecb():
+    lines = sources.formatted().splitlines()
+    assert any(re.match(r"ecb +European Central Bank", line) for line in lines)
+
+
+def test_formatted_names_aligned():
+    lines = sources.formatted().splitlines()
+    offsets = [len(re.match(r"(\w+ +)[^ ]", line)[1]) for line in lines]
+    first = offsets[0]
+    assert first > 1
+    assert all(offset == first for offset in offsets)