add error tests

tests/test_errors.py

@@ -0,0 +1,37 @@
+import pytest
+
+import voicemeeterlib
+from tests import data, vm
+
+
+class TestErrors:
+    __test__ = True
+
+    def test_it_tests_an_unknown_kind(self):
+        with pytest.raises(
+            voicemeeterlib.error.VMError,
+            match=f"Unknown Voicemeeter kind 'unknown_kind'",
+        ):
+            voicemeeterlib.api("unknown_kind")
+
+    def test_it_tests_an_unknown_parameter(self):
+        with pytest.raises(
+            voicemeeterlib.error.CAPIError,
+            match=f"VBVMR_SetParameterFloat returned -3",
+        ) as exc_info:
+            vm.set("unknown.parameter", 1)
+
+        e = exc_info.value
+        assert e.code == -3
+        assert e.fn_name == "VBVMR_SetParameterFloat"
+
+    def test_it_tests_an_invalid_config(self):
+        EXPECTED_MSG = (
+            f"No config with name 'unknown' is loaded into memory",
+            f"Known configs: {list(vm.configs.keys())}",
+        )
+        with pytest.raises(voicemeeterlib.error.VMError) as exc_info:
+            vm.apply_config("unknown")
+
+        e = exc_info.value
+        assert e.message == "\n".join(EXPECTED_MSG)