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diff --git a/tests/src/g23-exception-tests.cpp b/tests/src/g23-exception-tests.cpp
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+/**
+ *
+ * Copyright 2021-2023 Ribose Inc. (https://www.ribose.com)
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of
+ * this software and associated documentation files (the "Software"), to deal in
+ * the Software without restriction, including without limitation the rights to
+ * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+ * the Software, and to permit persons to whom the Software is furnished to do so,
+ * subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+ * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+ * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+ * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ *
+ */
+
+#include "sexp-tests.h"
+#include "sexpp/ext-key-format.h"
+
+using namespace sexp;
+using namespace ext_key_format;
+
+using ::testing::UnitTest;
+
+namespace {
+class G23ExceptionTests : public testing::Test {
+  protected:
+    static void do_scan_ex(const char *fn, const char *msg)
+    {
+        std::ifstream ifs(sexp_samples_folder + "/compat/g23/" + fn, std::ifstream::binary);
+        EXPECT_FALSE(ifs.fail());
+        if (!ifs.fail()) {
+            try {
+                ext_key_input_stream_t is(&ifs);
+                extended_private_key_t extended_key;
+                is.scan(extended_key);
+                FAIL() << "sexp::sexp_exception_t expected but has not been thrown";
+            } catch (sexp::sexp_exception_t &e) {
+                EXPECT_STREQ(e.what(), msg);
+            }
+        }
+    }
+};
+
+// Malformed extended key format, line break inside name
+TEST_F(G23ExceptionTests, G23MalformedNameBreak)
+{
+    do_scan_ex("malformed_name_break.key",
+               "EXTENDED KEY FORMAT ERROR: unexpected end of line at position 5");
+}
+
+// Malformed extended key format, eof break inside name
+TEST_F(G23ExceptionTests, G23MalformedNameEof)
+{
+    do_scan_ex("malformed_name_eof.key",
+               "EXTENDED KEY FORMAT ERROR: unexpected end of file at position 2800");
+}
+
+// Malformed extended key format, invalid character name
+TEST_F(G23ExceptionTests, G23MalformedInvalidNameChar)
+{
+    do_scan_ex(
+      "malformed_invalid_name_char.key",
+      "EXTENDED KEY FORMAT ERROR: unexpected character '@' (0x40) found in a name field "
+      "at position 28");
+}
+
+// Malformed extended key format, invalid character name
+TEST_F(G23ExceptionTests, G23MalformedInvalidNameFirstChar)
+{
+    do_scan_ex(
+      "malformed_invalid_name_first_char.key",
+      "EXTENDED KEY FORMAT ERROR: unexpected character '1' (0x31) found starting a name field "
+      "at position 21");
+}
+
+// Malformed extended key format, no key field
+TEST_F(G23ExceptionTests, G23MalformedNoKey)
+{
+    do_scan_ex("malformed_no_key.key",
+               "EXTENDED KEY FORMAT ERROR: missing mandatory 'key' field at position 2819");
+}
+
+// Malformed extended key format, two key fields
+TEST_F(G23ExceptionTests, G23MalformedTwoKeys)
+{
+    do_scan_ex("malformed_two_keys.key",
+               "EXTENDED KEY FORMAT ERROR: 'key' field must occur only once at position 2822");
+}
+
+TEST_F(G23ExceptionTests, G23Warning)
+{
+    testing::internal::CaptureStdout();
+    sexp::sexp_exception_t::set_interactive(true);
+    ext_key_error(sexp_exception_t::warning, "Test warning", 0, 0, 200);
+    std::string output = testing::internal::GetCapturedStdout();
+    EXPECT_EQ(output, "\n*** EXTENDED KEY FORMAT WARNING: Test warning at position 200 ***\n");
+    sexp::sexp_exception_t::set_interactive(false);
+}
+
+} // namespace