Add test/sha1_cx_2.cpp

test/Jamfile

@@ -119,6 +119,7 @@ run hmac_md5_cx_2.cpp ;
 run sha1.cpp ;
 run hmac_sha1.cpp ;
 run sha1_cx.cpp ;
+run sha1_cx_2.cpp ;
 
 run sha2.cpp ;
 run hmac_sha2.cpp ;

test/sha1_cx_2.cpp

@@ -0,0 +1,37 @@
+// Copyright 2024 Peter Dimov
+// Distributed under the Boost Software License, Version 1.0.
+// https://www.boost.org/LICENSE_1_0.txt
+
+#include <boost/hash2/sha1.hpp>
+#include <boost/core/lightweight_test.hpp>
+#include <boost/config.hpp>
+#include <array>
+
+#if defined(BOOST_MSVC) && BOOST_MSVC < 1920
+# pragma warning(disable: 4307) // integral constant overflow
+#endif
+
+#define STATIC_ASSERT(...) static_assert(__VA_ARGS__, #__VA_ARGS__)
+
+#if defined(BOOST_NO_CXX14_CONSTEXPR)
+
+# define TEST_EQ(x1, x2) BOOST_TEST_EQ(x1, x2)
+
+#else
+
+# define TEST_EQ(x1, x2) BOOST_TEST_EQ(x1, x2); STATIC_ASSERT(x1 == x2)
+
+#endif
+
+int main()
+{
+    using namespace boost::hash2;
+
+    BOOST_CXX14_CONSTEXPR digest<20> r = {{ 0xDA, 0x39, 0xA3, 0xEE, 0x5E, 0x6B, 0x4B, 0x0D, 0x32, 0x55, 0xBF, 0xEF, 0x95, 0x60, 0x18, 0x90, 0xAF, 0xD8, 0x07, 0x09 }};
+
+    TEST_EQ( sha1_160().result(), r );
+    TEST_EQ( sha1_160(0).result(), r );
+    TEST_EQ( sha1_160(nullptr, 0).result(), r );
+
+    return boost::report_errors();
+}