Tests added.

Some bug solved.

tests/test_errors.py

@@ -0,0 +1,62 @@
+import pytest
+from appengine import AEErrs, AppEngineException, is_number
+
+
+class TestIsNumber:
+    def test_integer_string(self):
+        assert is_number("42") is True
+
+    def test_float_string(self):
+        assert is_number("3.14") is True
+
+    def test_negative_string(self):
+        assert is_number("-1.5") is True
+
+    def test_non_numeric_string(self):
+        assert is_number("hello") is False
+
+    def test_empty_string(self):
+        assert is_number("") is False
+
+
+class TestAEErrs:
+    def test_parse_error_value(self):
+        assert AEErrs.PARSE_ERROR.value == -32700
+
+    def test_invalid_request_value(self):
+        assert AEErrs.INVALID_REQUEST.value == -32600
+
+    def test_meth_not_found_value(self):
+        assert AEErrs.METH_NOT_FOUND.value == -32601
+
+    def test_invalid_params_value(self):
+        assert AEErrs.INVALID_PARAMS.value == -32602
+
+    def test_internal_error_value(self):
+        assert AEErrs.INTERNAL_ERROR.value == -32000
+
+    def test_str_parse_error(self):
+        assert "Invalid JSON" in str(AEErrs.PARSE_ERROR)
+
+    def test_str_invalid_request(self):
+        assert "not a valid object" in str(AEErrs.INVALID_REQUEST)
+
+
+class TestAppEngineException:
+    def test_default_message(self):
+        exc = AppEngineException(AEErrs.INTERNAL_ERROR)
+        assert exc.value == AEErrs.INTERNAL_ERROR.value
+        assert "Internal error" in exc.mesg
+
+    def test_custom_message(self):
+        exc = AppEngineException(AEErrs.INVALID_PARAMS, "bad param")
+        assert exc.value == AEErrs.INVALID_PARAMS.value
+        assert exc.mesg == "bad param"
+
+    def test_inherits_exception(self):
+        assert isinstance(AppEngineException(AEErrs.INTERNAL_ERROR), Exception)
+
+    def test_raise_and_catch(self):
+        with pytest.raises(AppEngineException) as exc_info:
+            raise AppEngineException(AEErrs.METH_NOT_FOUND, "not found")
+        assert exc_info.value.value == AEErrs.METH_NOT_FOUND.value