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diff --git a/tests/src/g23-compat-tests.cpp b/tests/src/g23-compat-tests.cpp
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+++ b/tests/src/g23-compat-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 G23CompatTests : public testing::Test {
+  protected:
+    static void scan_and_check_correct(const char *fn)
+    {
+        std::ifstream ifs(sexp_samples_folder + "/compat/g23/" + fn, std::ifstream::binary);
+        bool          r = ifs.fail();
+        EXPECT_FALSE(r);
+
+        if (!ifs.fail()) {
+            ext_key_input_stream_t is(&ifs);
+            extended_private_key_t extended_key;
+            is.scan(extended_key);
+            EXPECT_EQ(extended_key.fields.size(), 2);
+            EXPECT_EQ(extended_key.fields.count("Created"), 1);
+            EXPECT_EQ(extended_key.fields.count("creaTed"), 1);
+            EXPECT_EQ(extended_key.fields.count("something"), 0);
+
+            auto search = extended_key.fields.find("Created");
+            if (search != extended_key.fields.end()) {
+                EXPECT_EQ(search->second, "20221130T160847");
+            }
+        }
+    }
+};
+
+TEST_F(G23CompatTests, G10Test)
+{
+    std::ifstream ifs(sexp_samples_folder + "/compat/g10/canonical.key",
+                      std::ifstream::binary);
+    bool          r = ifs.fail();
+    EXPECT_FALSE(r);
+
+    if (!ifs.fail()) {
+        ext_key_input_stream_t is(&ifs);
+        extended_private_key_t extended_key;
+        is.scan(extended_key);
+        EXPECT_EQ(extended_key.fields.size(), 0);
+    }
+}
+
+// Correct extended key format
+TEST_F(G23CompatTests, G23Correct)
+{
+    scan_and_check_correct("correct.key");
+}
+
+// Correct extended key format, no terminating end of line
+TEST_F(G23CompatTests, G23CorrectNoEol)
+{
+    scan_and_check_correct("correct_no_eol.key");
+}
+
+// Correct extended key format, with a comment
+TEST_F(G23CompatTests, G23CorrectWithComment)
+{
+    scan_and_check_correct("correct_with_comment.key");
+}
+
+// Correct extended key format, with an empty line (which is comment a well)
+TEST_F(G23CompatTests, G23CorrectWithTwoEmptyLines)
+{
+    scan_and_check_correct("correct_with_two_empty_lines.key");
+}
+
+// Correct extended key format, with two empty linea
+TEST_F(G23CompatTests, G23CorrectWithEmptyLine)
+{
+    scan_and_check_correct("correct_with_empty_line.key");
+}
+
+// Correct extended key format, witg windows line endings
+TEST_F(G23CompatTests, G23CorrectWithWindowsEol)
+{
+    scan_and_check_correct("correct_with_windows_eol.key");
+}
+
+// Correct extended key format, with a comment at the end of file
+TEST_F(G23CompatTests, G23CorrectWithCommentAtEof)
+{
+    scan_and_check_correct("correct_with_comment_at_eof.key");
+}
+
+// Correct extended key format, with multiple fields of the same name
+TEST_F(G23CompatTests, G23CorrectWithMultFields)
+{
+    std::ifstream ifs(sexp_samples_folder + "/compat/g23/correct_mult_fields.key",
+                      std::ifstream::binary);
+    bool          r = ifs.fail();
+    EXPECT_FALSE(r);
+
+    if (!ifs.fail()) {
+        ext_key_input_stream_t is(&ifs);
+        extended_private_key_t extended_key;
+        extended_key.parse(is);
+        EXPECT_EQ(extended_key.fields.size(), 4);
+        EXPECT_EQ(extended_key.fields.count("Created"), 1);
+        EXPECT_EQ(extended_key.fields.count("Description"), 3);
+        EXPECT_EQ(extended_key.fields.count("something"), 0);
+
+        auto search = extended_key.fields.find("Description");
+        if (search != extended_key.fields.end()) {
+            EXPECT_EQ(search->second, "RSA/RSA");
+        }
+    }
+}
+
+} // namespace