add coverage

tests/string_helper_tests.cpp

@@ -0,0 +1,24 @@
+#include <catch2/catch_test_macros.hpp>
+
+#include "helpers/string.hpp"
+
+TEST_CASE("StringHelper::split by char", "[string]") {
+    const auto tokens = StringHelper::split("a,b,,c", ',');
+    REQUIRE(tokens.size() == 3);
+    REQUIRE(tokens[0] == "a");
+    REQUIRE(tokens[1] == "b");
+    REQUIRE(tokens[2] == "c");
+}
+
+TEST_CASE("StringHelper::split by string", "[string]") {
+    const auto tokens = StringHelper::split("one::two::three", "::");
+    REQUIRE(tokens.size() == 3);
+    REQUIRE(tokens[0] == "one");
+    REQUIRE(tokens[1] == "two");
+    REQUIRE(tokens[2] == "three");
+}
+
+TEST_CASE("StringHelper::trimToSize", "[string]") {
+    REQUIRE(StringHelper::trimToSize("hello", 10) == "hello");
+    REQUIRE(StringHelper::trimToSize("hello world", 5) == "hello...");
+}