Minor fixes + tests + getSupportURL().

tests/python/test_guessed_string.py

@@ -0,0 +1,35 @@
+import mobase
+import pytest
+
+m = pytest.importorskip("mobase_tests.guessed_string")
+
+
+def test_guessed_string():
+
+    # empty string
+    gs = mobase.GuessedString()
+
+    assert len(gs.variants()) == 0
+    assert not gs.variants()
+    assert str(gs) == ""
+
+    # automatic conversion from string
+    assert m.get_value("test") == "test"
+    assert m.get_variants("test") == {"test"}
+
+    # update
+    gs = mobase.GuessedString("fallback", mobase.GuessQuality.FALLBACK)
+    assert str(gs) == "fallback"
+
+    gs.update("good", mobase.GuessQuality.GOOD)
+    assert str(gs) == "good"
+    assert gs.variants() == {"fallback", "good"}
+
+    # back-and-forth
+    gs = mobase.GuessedString()
+    assert str(gs) == ""
+
+    m.set_from_callback(gs, lambda gs: gs.update("test"))
+    assert str(gs) == "test"
+
+    assert m.get_from_callback(lambda gs: gs.update("test")) == "test"