diff --git a/tests/xtd.core.unit_tests/src/xtd/io/tests/file_not_found_exception_tests.cpp b/tests/xtd.core.unit_tests/src/xtd/io/tests/file_not_found_exception_tests.cpp
index dbdea016a24..eaab33ce336 100644
--- a/tests/xtd.core.unit_tests/src/xtd/io/tests/file_not_found_exception_tests.cpp
+++ b/tests/xtd.core.unit_tests/src/xtd/io/tests/file_not_found_exception_tests.cpp
@@ -1,6 +1,7 @@
 #include <xtd/io/file_not_found_exception>
 #include <xtd/argument_exception>
 #include <xtd/environment>
+#include <xtd/nullopt>
 #include <xtd/io/path>
 #include <xtd/reflection/assembly>
 #include <xtd/tunit/assert>
@@ -46,7 +47,7 @@ namespace xtd::io::tests {
       assert::are_equal("Unable to find the specified file.", e.what(), csf_);
     }
     
-    void test_method_(default_constructor_with_current_stack_frame) {
+    void test_method_(default_constructor_with_stack_frame) {
       auto stack_frame = current_stack_frame_;
       auto e = file_not_found_exception {stack_frame};
       assert::are_equal("xtd::io::file_not_found_exception", e.get_type().full_name(), csf_);
@@ -66,6 +67,45 @@ namespace xtd::io::tests {
       assert::are_equal("Unable to find the specified file.", e.what(), csf_);
     }
     
+    void test_method_(constructor_with_nullopt_message) {
+      auto e = file_not_found_exception {nullopt};
+      assert::are_equal("xtd::io::file_not_found_exception", e.get_type().full_name(), csf_);
+      assert::is_null(e.file_name(), csf_);
+      assert::is_empty(e.help_link(), csf_);
+      assert::are_equal(h_result::COR_E_FILENOTFOUND, e.h_result(), csf_);
+      assert::are_equal(h_result::h_result_category(), e.error_code().category(), csf_);
+      assert::are_equal(e.h_result(), e.error_code().value(), csf_);
+      assert::is_null(e.inner_exception(), csf_);
+      assert::are_equal("Unable to find the specified file.", e.message(), csf_);
+      assert::are_equal(path::get_file_name(assembly::get_executing_assembly().location()), e.source(), csf_);
+      assert::is_empty(e.stack_trace(), csf_);
+      assert::is_empty(e.get_last_stack_frame().get_file_name(), csf_);
+      assert::are_equal(0u, e.get_last_stack_frame().get_file_line_number(), csf_);
+      assert::is_empty(e.get_last_stack_frame().get_method(), csf_);
+      assert::are_equal("xtd::io::file_not_found_exception : Unable to find the specified file.", e.to_string(), csf_);
+      assert::are_equal("Unable to find the specified file.", e.what(), csf_);
+    }
+    
+    void test_method_(constructor_with_nullopt_message_and_stack_frame) {
+      auto stack_frame = current_stack_frame_;
+      auto e = file_not_found_exception {nullopt, stack_frame};
+      assert::are_equal("xtd::io::file_not_found_exception", e.get_type().full_name(), csf_);
+      assert::is_null(e.file_name(), csf_);
+      assert::is_empty(e.help_link(), csf_);
+      assert::are_equal(h_result::COR_E_FILENOTFOUND, e.h_result(), csf_);
+      assert::are_equal(h_result::h_result_category(), e.error_code().category(), csf_);
+      assert::are_equal(e.h_result(), e.error_code().value(), csf_);
+      assert::is_null(e.inner_exception(), csf_);
+      assert::are_equal("Unable to find the specified file.", e.message(), csf_);
+      assert::are_equal(path::get_file_name(assembly::get_executing_assembly().location()), e.source(), csf_);
+      assert::are_equal(stack_frame.to_string(), e.stack_trace(), csf_);
+      assert::are_equal(stack_frame.get_file_name(), e.get_last_stack_frame().get_file_name(), csf_);
+      assert::are_equal(stack_frame.get_file_line_number(), e.get_last_stack_frame().get_file_line_number(), csf_);
+      assert::are_equal(stack_frame.get_method(), e.get_last_stack_frame().get_method(), csf_);
+      assert::are_equal("xtd::io::file_not_found_exception : Unable to find the specified file." + environment::new_line() + stack_frame.to_string(), e.to_string(), csf_);
+      assert::are_equal("Unable to find the specified file.", e.what(), csf_);
+    }
+
     void test_method_(constructor_with_empty_message) {
       auto e = file_not_found_exception {""};
       assert::are_equal("xtd::io::file_not_found_exception", e.get_type().full_name(), csf_);
@@ -144,6 +184,172 @@ namespace xtd::io::tests {
       assert::are_equal("Test excpetion message.", e.what(), csf_);
     }
     
+    void test_method_(constructor_with_nullopt_message_and_nullopt_file_name) {
+      auto e = file_not_found_exception {nullopt, nullopt};
+      assert::are_equal("xtd::io::file_not_found_exception", e.get_type().full_name(), csf_);
+      assert::is_null(e.file_name(), csf_);
+      assert::is_empty(e.help_link(), csf_);
+      assert::are_equal(h_result::COR_E_FILENOTFOUND, e.h_result(), csf_);
+      assert::are_equal(h_result::h_result_category(), e.error_code().category(), csf_);
+      assert::are_equal(e.h_result(), e.error_code().value(), csf_);
+      assert::is_null(e.inner_exception(), csf_);
+      assert::are_equal("Unable to find the specified file.", e.message(), csf_);
+      assert::are_equal(path::get_file_name(assembly::get_executing_assembly().location()), e.source(), csf_);
+      assert::is_empty(e.stack_trace(), csf_);
+      assert::is_empty(e.get_last_stack_frame().get_file_name(), csf_);
+      assert::are_equal(0u, e.get_last_stack_frame().get_file_line_number(), csf_);
+      assert::is_empty(e.get_last_stack_frame().get_method(), csf_);
+      assert::are_equal("xtd::io::file_not_found_exception : Unable to find the specified file.", e.to_string(), csf_);
+      assert::are_equal("Unable to find the specified file.", e.what(), csf_);
+    }
+    
+    void test_method_(constructor_with_nullopt_message_nullopt_file_name_and_stack_frame) {
+      auto stack_frame = current_stack_frame_;
+      auto e = file_not_found_exception {nullopt, nullopt, stack_frame};
+      assert::are_equal("xtd::io::file_not_found_exception", e.get_type().full_name(), csf_);
+      assert::is_null(e.file_name(), csf_);
+      assert::is_empty(e.help_link(), csf_);
+      assert::are_equal(h_result::COR_E_FILENOTFOUND, e.h_result(), csf_);
+      assert::are_equal(h_result::h_result_category(), e.error_code().category(), csf_);
+      assert::are_equal(e.h_result(), e.error_code().value(), csf_);
+      assert::is_null(e.inner_exception(), csf_);
+      assert::are_equal("Unable to find the specified file.", e.message(), csf_);
+      assert::are_equal(path::get_file_name(assembly::get_executing_assembly().location()), e.source(), csf_);
+      assert::are_equal(stack_frame.to_string(), e.stack_trace(), csf_);
+      assert::are_equal(stack_frame.get_file_name(), e.get_last_stack_frame().get_file_name(), csf_);
+      assert::are_equal(stack_frame.get_file_line_number(), e.get_last_stack_frame().get_file_line_number(), csf_);
+      assert::are_equal(stack_frame.get_method(), e.get_last_stack_frame().get_method(), csf_);
+      assert::are_equal("xtd::io::file_not_found_exception : Unable to find the specified file." + environment::new_line() + stack_frame.to_string(), e.to_string(), csf_);
+      assert::are_equal("Unable to find the specified file.", e.what(), csf_);
+    }
+
+    void test_method_(constructor_with_nullopt_message_and_file_name) {
+      auto e = file_not_found_exception {nullopt, "my_file.txt"};
+      assert::are_equal("xtd::io::file_not_found_exception", e.get_type().full_name(), csf_);
+      assert::is_not_null(e.file_name(), csf_);
+      assert::are_equal("my_file.txt", e.file_name().value(), csf_);
+      assert::is_empty(e.help_link(), csf_);
+      assert::are_equal(h_result::COR_E_FILENOTFOUND, e.h_result(), csf_);
+      assert::are_equal(h_result::h_result_category(), e.error_code().category(), csf_);
+      assert::are_equal(e.h_result(), e.error_code().value(), csf_);
+      assert::is_null(e.inner_exception(), csf_);
+      assert::are_equal("Could not load file 'my_file.txt'. The system cannot find the file specified.", e.message(), csf_);
+      assert::are_equal(path::get_file_name(assembly::get_executing_assembly().location()), e.source(), csf_);
+      assert::is_empty(e.stack_trace(), csf_);
+      assert::is_empty(e.get_last_stack_frame().get_file_name(), csf_);
+      assert::are_equal(0u, e.get_last_stack_frame().get_file_line_number(), csf_);
+      assert::is_empty(e.get_last_stack_frame().get_method(), csf_);
+      assert::are_equal("xtd::io::file_not_found_exception : Could not load file 'my_file.txt'. The system cannot find the file specified.", e.to_string(), csf_);
+      assert::are_equal("Could not load file 'my_file.txt'. The system cannot find the file specified.", e.what(), csf_);
+    }
+    
+    void test_method_(constructor_with_nullopt_message_file_name_and_stack_frame) {
+      auto stack_frame = current_stack_frame_;
+      auto e = file_not_found_exception {nullopt, "my_file.txt", stack_frame};
+      assert::are_equal("xtd::io::file_not_found_exception", e.get_type().full_name(), csf_);
+      assert::is_not_null(e.file_name(), csf_);
+      assert::are_equal("my_file.txt", e.file_name().value(), csf_);
+      assert::is_empty(e.help_link(), csf_);
+      assert::are_equal(h_result::COR_E_FILENOTFOUND, e.h_result(), csf_);
+      assert::are_equal(h_result::h_result_category(), e.error_code().category(), csf_);
+      assert::are_equal(e.h_result(), e.error_code().value(), csf_);
+      assert::is_null(e.inner_exception(), csf_);
+      assert::are_equal("Could not load file 'my_file.txt'. The system cannot find the file specified.", e.message(), csf_);
+      assert::are_equal(path::get_file_name(assembly::get_executing_assembly().location()), e.source(), csf_);
+      assert::are_equal(stack_frame.to_string(), e.stack_trace(), csf_);
+      assert::are_equal(stack_frame.get_file_name(), e.get_last_stack_frame().get_file_name(), csf_);
+      assert::are_equal(stack_frame.get_file_line_number(), e.get_last_stack_frame().get_file_line_number(), csf_);
+      assert::are_equal(stack_frame.get_method(), e.get_last_stack_frame().get_method(), csf_);
+      assert::are_equal("xtd::io::file_not_found_exception : Could not load file 'my_file.txt'. The system cannot find the file specified." + environment::new_line() + stack_frame.to_string(), e.to_string(), csf_);
+      assert::are_equal("Could not load file 'my_file.txt'. The system cannot find the file specified.", e.what(), csf_);
+    }
+
+    void test_method_(constructor_with_message_and_file_name) {
+      auto e = file_not_found_exception {"Test excpetion message.", "my_file.txt"};
+      assert::are_equal("xtd::io::file_not_found_exception", e.get_type().full_name(), csf_);
+      assert::is_not_null(e.file_name(), csf_);
+      assert::are_equal("my_file.txt", e.file_name().value(), csf_);
+      assert::is_empty(e.help_link(), csf_);
+      assert::are_equal(h_result::COR_E_FILENOTFOUND, e.h_result(), csf_);
+      assert::are_equal(h_result::h_result_category(), e.error_code().category(), csf_);
+      assert::are_equal(e.h_result(), e.error_code().value(), csf_);
+      assert::is_null(e.inner_exception(), csf_);
+      assert::are_equal("Test excpetion message.", e.message(), csf_);
+      assert::are_equal(path::get_file_name(assembly::get_executing_assembly().location()), e.source(), csf_);
+      assert::is_empty(e.stack_trace(), csf_);
+      assert::is_empty(e.get_last_stack_frame().get_file_name(), csf_);
+      assert::are_equal(0u, e.get_last_stack_frame().get_file_line_number(), csf_);
+      assert::is_empty(e.get_last_stack_frame().get_method(), csf_);
+      assert::are_equal("xtd::io::file_not_found_exception : Test excpetion message.", e.to_string(), csf_);
+      assert::are_equal("Test excpetion message.", e.what(), csf_);
+    }
+    
+    void test_method_(constructor_with_message_file_name_and_stack_frame) {
+      auto stack_frame = current_stack_frame_;
+      auto e = file_not_found_exception {"Test excpetion message.", "my_file.txt", stack_frame};
+      assert::are_equal("xtd::io::file_not_found_exception", e.get_type().full_name(), csf_);
+      assert::is_not_null(e.file_name(), csf_);
+      assert::are_equal("my_file.txt", e.file_name().value(), csf_);
+      assert::is_empty(e.help_link(), csf_);
+      assert::are_equal(h_result::COR_E_FILENOTFOUND, e.h_result(), csf_);
+      assert::are_equal(h_result::h_result_category(), e.error_code().category(), csf_);
+      assert::are_equal(e.h_result(), e.error_code().value(), csf_);
+      assert::is_null(e.inner_exception(), csf_);
+      assert::are_equal("Test excpetion message.", e.message(), csf_);
+      assert::are_equal(path::get_file_name(assembly::get_executing_assembly().location()), e.source(), csf_);
+      assert::are_equal(stack_frame.to_string(), e.stack_trace(), csf_);
+      assert::are_equal(stack_frame.get_file_name(), e.get_last_stack_frame().get_file_name(), csf_);
+      assert::are_equal(stack_frame.get_file_line_number(), e.get_last_stack_frame().get_file_line_number(), csf_);
+      assert::are_equal(stack_frame.get_method(), e.get_last_stack_frame().get_method(), csf_);
+      assert::are_equal("xtd::io::file_not_found_exception : Test excpetion message." + environment::new_line() + stack_frame.to_string(), e.to_string(), csf_);
+      assert::are_equal("Test excpetion message.", e.what(), csf_);
+    }
+    
+    void test_method_(constructor_with_nullopt_message_and_inner_exception) {
+      auto inner_exception = argument_exception {};
+      auto e = file_not_found_exception {nullopt, inner_exception};
+      assert::are_equal("xtd::io::file_not_found_exception", e.get_type().full_name(), csf_);
+      assert::is_null(e.file_name(), csf_);
+      assert::is_empty(e.help_link(), csf_);
+      assert::are_equal(h_result::COR_E_FILENOTFOUND, e.h_result(), csf_);
+      assert::are_equal(h_result::h_result_category(), e.error_code().category(), csf_);
+      assert::are_equal(e.h_result(), e.error_code().value(), csf_);
+      assert::is_not_null(e.inner_exception(), csf_);
+      assert::is_instance_of<xtd::argument_exception>(e.inner_exception().value().get(), csf_);
+      assert::are_equal(inner_exception.to_string(), e.inner_exception().value().get().to_string(), csf_);
+      assert::are_equal("Unable to find the specified file.", e.message(), csf_);
+      assert::are_equal(path::get_file_name(assembly::get_executing_assembly().location()), e.source(), csf_);
+      assert::is_empty(e.stack_trace(), csf_);
+      assert::is_empty(e.get_last_stack_frame().get_file_name(), csf_);
+      assert::are_equal(0u, e.get_last_stack_frame().get_file_line_number(), csf_);
+      assert::is_empty(e.get_last_stack_frame().get_method(), csf_);
+      assert::are_equal("xtd::io::file_not_found_exception : Unable to find the specified file.", e.to_string(), csf_);
+      assert::are_equal("Unable to find the specified file.", e.what(), csf_);
+    }
+    
+    void test_method_(constructor_with_nullopt_message_inner_exception_and_stack_frame) {
+      auto inner_exception = argument_exception {};
+      auto stack_frame = current_stack_frame_;
+      auto e = file_not_found_exception {nullopt, inner_exception, stack_frame};
+      assert::are_equal("xtd::io::file_not_found_exception", e.get_type().full_name(), csf_);
+      assert::is_null(e.file_name(), csf_);
+      assert::is_empty(e.help_link(), csf_);
+      assert::are_equal(h_result::COR_E_FILENOTFOUND, e.h_result(), csf_);
+      assert::are_equal(h_result::h_result_category(), e.error_code().category(), csf_);
+      assert::are_equal(e.h_result(), e.error_code().value(), csf_);
+      assert::is_not_null(e.inner_exception(), csf_);
+      assert::is_instance_of<xtd::argument_exception>(e.inner_exception().value().get(), csf_);
+      assert::are_equal(inner_exception.to_string(), e.inner_exception().value().get().to_string(), csf_);
+      assert::are_equal("Unable to find the specified file.", e.message(), csf_);
+      assert::are_equal(path::get_file_name(assembly::get_executing_assembly().location()), e.source(), csf_);
+      assert::are_equal(stack_frame.to_string(), e.stack_trace(), csf_);
+      assert::are_equal(stack_frame.get_file_name(), e.get_last_stack_frame().get_file_name(), csf_);
+      assert::are_equal(stack_frame.get_file_line_number(), e.get_last_stack_frame().get_file_line_number(), csf_);
+      assert::are_equal(stack_frame.get_method(), e.get_last_stack_frame().get_method(), csf_);
+      assert::are_equal("xtd::io::file_not_found_exception : Unable to find the specified file." + environment::new_line() + stack_frame.to_string(), e.to_string(), csf_);
+      assert::are_equal("Unable to find the specified file.", e.what(), csf_);
+    }
+
     void test_method_(constructor_with_message_and_inner_exception) {
       auto inner_exception = argument_exception {};
       auto e = file_not_found_exception {"Test excpetion message.", inner_exception};
@@ -187,5 +393,187 @@ namespace xtd::io::tests {
       assert::are_equal("xtd::io::file_not_found_exception : Test excpetion message." + environment::new_line() + stack_frame.to_string(), e.to_string(), csf_);
       assert::are_equal("Test excpetion message.", e.what(), csf_);
     }
+    
+    void test_method_(constructor_with_nullopt_message_nullopt_file_name_and_inner_exception) {
+      auto inner_exception = argument_exception {};
+      auto e = file_not_found_exception {nullopt, nullopt, inner_exception};
+      assert::are_equal("xtd::io::file_not_found_exception", e.get_type().full_name(), csf_);
+      assert::is_null(e.file_name(), csf_);
+      assert::is_empty(e.help_link(), csf_);
+      assert::are_equal(h_result::COR_E_FILENOTFOUND, e.h_result(), csf_);
+      assert::are_equal(h_result::h_result_category(), e.error_code().category(), csf_);
+      assert::are_equal(e.h_result(), e.error_code().value(), csf_);
+      assert::is_not_null(e.inner_exception(), csf_);
+      assert::is_instance_of<xtd::argument_exception>(e.inner_exception().value().get(), csf_);
+      assert::are_equal(inner_exception.to_string(), e.inner_exception().value().get().to_string(), csf_);
+      assert::are_equal("Unable to find the specified file.", e.message(), csf_);
+      assert::are_equal(path::get_file_name(assembly::get_executing_assembly().location()), e.source(), csf_);
+      assert::is_empty(e.stack_trace(), csf_);
+      assert::is_empty(e.get_last_stack_frame().get_file_name(), csf_);
+      assert::are_equal(0u, e.get_last_stack_frame().get_file_line_number(), csf_);
+      assert::is_empty(e.get_last_stack_frame().get_method(), csf_);
+      assert::are_equal("xtd::io::file_not_found_exception : Unable to find the specified file.", e.to_string(), csf_);
+      assert::are_equal("Unable to find the specified file.", e.what(), csf_);
+    }
+    
+    void test_method_(constructor_with_nullopt_message_nullopt_file_name_inner_exception_and_stack_frame) {
+      auto inner_exception = argument_exception {};
+      auto stack_frame = current_stack_frame_;
+      auto e = file_not_found_exception {nullopt, nullopt, inner_exception, stack_frame};
+      assert::are_equal("xtd::io::file_not_found_exception", e.get_type().full_name(), csf_);
+      assert::is_null(e.file_name(), csf_);
+      assert::is_empty(e.help_link(), csf_);
+      assert::are_equal(h_result::COR_E_FILENOTFOUND, e.h_result(), csf_);
+      assert::are_equal(h_result::h_result_category(), e.error_code().category(), csf_);
+      assert::are_equal(e.h_result(), e.error_code().value(), csf_);
+      assert::is_not_null(e.inner_exception(), csf_);
+      assert::is_instance_of<xtd::argument_exception>(e.inner_exception().value().get(), csf_);
+      assert::are_equal(inner_exception.to_string(), e.inner_exception().value().get().to_string(), csf_);
+      assert::are_equal("Unable to find the specified file.", e.message(), csf_);
+      assert::are_equal(path::get_file_name(assembly::get_executing_assembly().location()), e.source(), csf_);
+      assert::are_equal(stack_frame.to_string(), e.stack_trace(), csf_);
+      assert::are_equal(stack_frame.get_file_name(), e.get_last_stack_frame().get_file_name(), csf_);
+      assert::are_equal(stack_frame.get_file_line_number(), e.get_last_stack_frame().get_file_line_number(), csf_);
+      assert::are_equal(stack_frame.get_method(), e.get_last_stack_frame().get_method(), csf_);
+      assert::are_equal("xtd::io::file_not_found_exception : Unable to find the specified file." + environment::new_line() + stack_frame.to_string(), e.to_string(), csf_);
+      assert::are_equal("Unable to find the specified file.", e.what(), csf_);
+    }
+    
+    void test_method_(constructor_with_message_nullopt_file_name_and_inner_exception) {
+      auto inner_exception = argument_exception {};
+      auto e = file_not_found_exception {"Test excpetion message.", nullopt, inner_exception};
+      assert::is_null(e.file_name(), csf_);
+      assert::is_empty(e.help_link(), csf_);
+      assert::are_equal(h_result::COR_E_FILENOTFOUND, e.h_result(), csf_);
+      assert::are_equal(h_result::h_result_category(), e.error_code().category(), csf_);
+      assert::are_equal(e.h_result(), e.error_code().value(), csf_);
+      assert::is_not_null(e.inner_exception(), csf_);
+      assert::is_instance_of<xtd::argument_exception>(e.inner_exception().value().get(), csf_);
+      assert::are_equal(inner_exception.to_string(), e.inner_exception().value().get().to_string(), csf_);
+      assert::are_equal("Test excpetion message.", e.message(), csf_);
+      assert::are_equal(path::get_file_name(assembly::get_executing_assembly().location()), e.source(), csf_);
+      assert::is_empty(e.stack_trace(), csf_);
+      assert::is_empty(e.get_last_stack_frame().get_file_name(), csf_);
+      assert::are_equal(0u, e.get_last_stack_frame().get_file_line_number(), csf_);
+      assert::is_empty(e.get_last_stack_frame().get_method(), csf_);
+      assert::are_equal("xtd::io::file_not_found_exception : Test excpetion message.", e.to_string(), csf_);
+      assert::are_equal("Test excpetion message.", e.what(), csf_);
+    }
+    
+    void test_method_(constructor_with_message_nullopt_file_name_inner_exception_and_stack_frame) {
+      auto inner_exception = argument_exception {};
+      auto stack_frame = current_stack_frame_;
+      auto e = file_not_found_exception {"Test excpetion message.", nullopt, inner_exception, stack_frame};
+      assert::is_null(e.file_name(), csf_);
+      assert::are_equal("xtd::io::file_not_found_exception", e.get_type().full_name(), csf_);
+      assert::is_empty(e.help_link(), csf_);
+      assert::are_equal(h_result::COR_E_FILENOTFOUND, e.h_result(), csf_);
+      assert::are_equal(h_result::h_result_category(), e.error_code().category(), csf_);
+      assert::are_equal(e.h_result(), e.error_code().value(), csf_);
+      assert::is_not_null(e.inner_exception(), csf_);
+      assert::is_instance_of<xtd::argument_exception>(e.inner_exception().value().get(), csf_);
+      assert::are_equal(inner_exception.to_string(), e.inner_exception().value().get().to_string(), csf_);
+      assert::are_equal("Test excpetion message.", e.message(), csf_);
+      assert::are_equal(path::get_file_name(assembly::get_executing_assembly().location()), e.source(), csf_);
+      assert::are_equal(stack_frame.to_string(), e.stack_trace(), csf_);
+      assert::are_equal(stack_frame.get_file_name(), e.get_last_stack_frame().get_file_name(), csf_);
+      assert::are_equal(stack_frame.get_file_line_number(), e.get_last_stack_frame().get_file_line_number(), csf_);
+      assert::are_equal(stack_frame.get_method(), e.get_last_stack_frame().get_method(), csf_);
+      assert::are_equal("xtd::io::file_not_found_exception : Test excpetion message." + environment::new_line() + stack_frame.to_string(), e.to_string(), csf_);
+      assert::are_equal("Test excpetion message.", e.what(), csf_);
+    }
+    
+    void test_method_(constructor_with_nullopt_message_file_name_and_inner_exception) {
+      auto inner_exception = argument_exception {};
+      auto e = file_not_found_exception {nullopt, "my_file.txt", inner_exception};
+      assert::are_equal("xtd::io::file_not_found_exception", e.get_type().full_name(), csf_);
+      assert::is_not_null(e.file_name(), csf_);
+      assert::are_equal("my_file.txt", e.file_name().value(), csf_);
+      assert::is_empty(e.help_link(), csf_);
+      assert::are_equal(h_result::COR_E_FILENOTFOUND, e.h_result(), csf_);
+      assert::are_equal(h_result::h_result_category(), e.error_code().category(), csf_);
+      assert::are_equal(e.h_result(), e.error_code().value(), csf_);
+      assert::is_not_null(e.inner_exception(), csf_);
+      assert::is_instance_of<xtd::argument_exception>(e.inner_exception().value().get(), csf_);
+      assert::are_equal(inner_exception.to_string(), e.inner_exception().value().get().to_string(), csf_);
+      assert::are_equal("Could not load file 'my_file.txt'. The system cannot find the file specified.", e.message(), csf_);
+      assert::are_equal(path::get_file_name(assembly::get_executing_assembly().location()), e.source(), csf_);
+      assert::is_empty(e.stack_trace(), csf_);
+      assert::is_empty(e.get_last_stack_frame().get_file_name(), csf_);
+      assert::are_equal(0u, e.get_last_stack_frame().get_file_line_number(), csf_);
+      assert::is_empty(e.get_last_stack_frame().get_method(), csf_);
+      assert::are_equal("xtd::io::file_not_found_exception : Could not load file 'my_file.txt'. The system cannot find the file specified.", e.to_string(), csf_);
+      assert::are_equal("Could not load file 'my_file.txt'. The system cannot find the file specified.", e.what(), csf_);
+    }
+    
+    void test_method_(constructor_with_nullopt_message_file_name_inner_exception_and_stack_frame) {
+      auto inner_exception = argument_exception {};
+      auto stack_frame = current_stack_frame_;
+      auto e = file_not_found_exception {nullopt, "my_file.txt", inner_exception, stack_frame};
+      assert::are_equal("xtd::io::file_not_found_exception", e.get_type().full_name(), csf_);
+      assert::is_not_null(e.file_name(), csf_);
+      assert::are_equal("my_file.txt", e.file_name().value(), csf_);
+      assert::is_empty(e.help_link(), csf_);
+      assert::are_equal(h_result::COR_E_FILENOTFOUND, e.h_result(), csf_);
+      assert::are_equal(h_result::h_result_category(), e.error_code().category(), csf_);
+      assert::are_equal(e.h_result(), e.error_code().value(), csf_);
+      assert::is_not_null(e.inner_exception(), csf_);
+      assert::is_instance_of<xtd::argument_exception>(e.inner_exception().value().get(), csf_);
+      assert::are_equal(inner_exception.to_string(), e.inner_exception().value().get().to_string(), csf_);
+      assert::are_equal("Could not load file 'my_file.txt'. The system cannot find the file specified.", e.message(), csf_);
+      assert::are_equal(path::get_file_name(assembly::get_executing_assembly().location()), e.source(), csf_);
+      assert::are_equal(stack_frame.to_string(), e.stack_trace(), csf_);
+      assert::are_equal(stack_frame.get_file_name(), e.get_last_stack_frame().get_file_name(), csf_);
+      assert::are_equal(stack_frame.get_file_line_number(), e.get_last_stack_frame().get_file_line_number(), csf_);
+      assert::are_equal(stack_frame.get_method(), e.get_last_stack_frame().get_method(), csf_);
+      assert::are_equal("xtd::io::file_not_found_exception : Could not load file 'my_file.txt'. The system cannot find the file specified." + environment::new_line() + stack_frame.to_string(), e.to_string(), csf_);
+      assert::are_equal("Could not load file 'my_file.txt'. The system cannot find the file specified.", e.what(), csf_);
+    }
+    
+    void test_method_(constructor_with_message_file_name_and_inner_exception) {
+      auto inner_exception = argument_exception {};
+      auto e = file_not_found_exception {"Test excpetion message.", "my_file.txt", inner_exception};
+      assert::is_not_null(e.file_name(), csf_);
+      assert::are_equal("my_file.txt", e.file_name().value(), csf_);
+      assert::is_empty(e.help_link(), csf_);
+      assert::are_equal(h_result::COR_E_FILENOTFOUND, e.h_result(), csf_);
+      assert::are_equal(h_result::h_result_category(), e.error_code().category(), csf_);
+      assert::are_equal(e.h_result(), e.error_code().value(), csf_);
+      assert::is_not_null(e.inner_exception(), csf_);
+      assert::is_instance_of<xtd::argument_exception>(e.inner_exception().value().get(), csf_);
+      assert::are_equal(inner_exception.to_string(), e.inner_exception().value().get().to_string(), csf_);
+      assert::are_equal("Test excpetion message.", e.message(), csf_);
+      assert::are_equal(path::get_file_name(assembly::get_executing_assembly().location()), e.source(), csf_);
+      assert::is_empty(e.stack_trace(), csf_);
+      assert::is_empty(e.get_last_stack_frame().get_file_name(), csf_);
+      assert::are_equal(0u, e.get_last_stack_frame().get_file_line_number(), csf_);
+      assert::is_empty(e.get_last_stack_frame().get_method(), csf_);
+      assert::are_equal("xtd::io::file_not_found_exception : Test excpetion message.", e.to_string(), csf_);
+      assert::are_equal("Test excpetion message.", e.what(), csf_);
+    }
+    
+    void test_method_(constructor_with_message_file_name_inner_exception_and_stack_frame) {
+      auto inner_exception = argument_exception {};
+      auto stack_frame = current_stack_frame_;
+      auto e = file_not_found_exception {"Test excpetion message.", "my_file.txt", inner_exception, stack_frame};
+      assert::is_not_null(e.file_name(), csf_);
+      assert::are_equal("my_file.txt", e.file_name().value(), csf_);
+      assert::are_equal("xtd::io::file_not_found_exception", e.get_type().full_name(), csf_);
+      assert::is_empty(e.help_link(), csf_);
+      assert::are_equal(h_result::COR_E_FILENOTFOUND, e.h_result(), csf_);
+      assert::are_equal(h_result::h_result_category(), e.error_code().category(), csf_);
+      assert::are_equal(e.h_result(), e.error_code().value(), csf_);
+      assert::is_not_null(e.inner_exception(), csf_);
+      assert::is_instance_of<xtd::argument_exception>(e.inner_exception().value().get(), csf_);
+      assert::are_equal(inner_exception.to_string(), e.inner_exception().value().get().to_string(), csf_);
+      assert::are_equal("Test excpetion message.", e.message(), csf_);
+      assert::are_equal(path::get_file_name(assembly::get_executing_assembly().location()), e.source(), csf_);
+      assert::are_equal(stack_frame.to_string(), e.stack_trace(), csf_);
+      assert::are_equal(stack_frame.get_file_name(), e.get_last_stack_frame().get_file_name(), csf_);
+      assert::are_equal(stack_frame.get_file_line_number(), e.get_last_stack_frame().get_file_line_number(), csf_);
+      assert::are_equal(stack_frame.get_method(), e.get_last_stack_frame().get_method(), csf_);
+      assert::are_equal("xtd::io::file_not_found_exception : Test excpetion message." + environment::new_line() + stack_frame.to_string(), e.to_string(), csf_);
+      assert::are_equal("Test excpetion message.", e.what(), csf_);
+    }
   };
 }