Add missing pgmspace test file

tests/host/core/test_pgmspace.cpp

@@ -0,0 +1,55 @@
+/*
+ test_pgmspace.cpp - pgmspace tests
+ Copyright © 2016 Ivan Grokhotkov
+
+ 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.
+ */
+
+#include <catch.hpp>
+#include <string.h>
+#include <pgmspace.h>
+
+TEST_CASE("strstr_P works as strstr", "[core][pgmspace]")
+{
+    auto t = [](const char* h, const char* n) {
+        char* strstr_P_result = strstr_P(h, n);
+        char* strstr_result = strstr(h, n);
+        REQUIRE(strstr_P_result == strstr_result);
+    };
+
+    // Test case data is from avr-libc, original copyright (c) 2007  Dmitry Xmelkov
+    // See avr-libc/tests/simulate/pmstring/strstr_P.c
+    t ("", "");
+    t("12345", "");
+    t("ababac", "abac");
+    t("", "a");
+    t("b", "a");
+    t("a", "a");
+    t("abcbef", "a");
+    t(".a", "a");
+    t(".a.", "a");
+    t("ABCDEFGH", "H");
+    t("", "12");
+    t("13", "12");
+    t("32", "12");
+    t("12", "12");
+    t("123", "12");
+    t("012", "12");
+    t("01200", "12");
+    t("a_ab_abc_abcd_abcde", "abcdef");
+    t("a_ab_abc_abcd_abcde_abcdef", "abcdef");
+    t("aababcabcdabcde", "abcdef");
+    t("aababcabcdabcdeabcdef", "abcdef");
+    t("abaabaaabaaaab", "aaaaab");
+    t("abaabaaabaaaabaaaaab", "aaaaab");
+    t("_foo_foo", "foo");
+    t("A", "a");
+}