test: add test to make error_info

check if it compiles

tests/CMakeLists.txt

@@ -1,6 +1,7 @@
 set(TOML11_TEST_NAMES
     test_comments
     test_datetime
+    test_error_message
     test_find
     test_find_or
     test_format_integer

tests/test_error_message.cpp

@@ -0,0 +1,79 @@
+#define DOCTEST_CONFIG_IMPLEMENT_WITH_MAIN
+#include "doctest.h"
+
+#include <toml.hpp>
+
+TEST_CASE("testing custom error message using source_location")
+{
+    const toml::value root = toml::parse_str(R"(
+        range = [0, 42]
+        val = 54
+    )");
+
+    const auto& lower = root.at("range").at(0);
+    const auto& upper = root.at("range").at(1);
+    const auto& val = root.at("val");
+
+    const auto err = toml::make_error_info("val not in range",
+            lower.location(), "lower limit is defined here",
+            upper.location(), "upper limit is defined here",
+            val.location(),   "this is not in the range",
+            "Hint: upper limit is inclusive"
+        );
+
+    CHECK_EQ(err.title(), "val not in range");
+    CHECK_EQ(err.locations().size(), 3);
+    CHECK_EQ(err.locations().at(0).second, "lower limit is defined here");
+    CHECK_EQ(err.locations().at(1).second, "upper limit is defined here");
+    CHECK_EQ(err.locations().at(2).second, "this is not in the range"   );
+}
+
+TEST_CASE("testing custom error message using value")
+{
+    const toml::value root = toml::parse_str(R"(
+        range = [0, 42]
+        val = 54
+    )");
+
+    const auto& lower = root.at("range").at(0);
+    const auto& upper = root.at("range").at(1);
+    const auto& val = root.at("val");
+
+    const auto err = toml::make_error_info("val not in range",
+            lower, "lower limit is defined here",
+            upper, "upper limit is defined here",
+            val,   "this is not in the range",
+            "Hint: upper limit is inclusive"
+        );
+
+    CHECK_EQ(err.title(), "val not in range");
+    CHECK_EQ(err.locations().size(), 3);
+    CHECK_EQ(err.locations().at(0).second, "lower limit is defined here");
+    CHECK_EQ(err.locations().at(1).second, "upper limit is defined here");
+    CHECK_EQ(err.locations().at(2).second, "this is not in the range"   );
+}
+
+TEST_CASE("testing custom error message using source_location and value")
+{
+    const toml::value root = toml::parse_str(R"(
+        range = [0, 42]
+        val = 54
+    )");
+
+    const auto& lower = root.at("range").at(0);
+    const auto& upper = root.at("range").at(1);
+    const auto& val = root.at("val");
+
+    const auto err = toml::make_error_info("val not in range",
+            lower,          "lower limit is defined here",
+            upper,          "upper limit is defined here",
+            val.location(), "this is not in the range",
+            "Hint: upper limit is inclusive"
+        );
+
+    CHECK_EQ(err.title(), "val not in range");
+    CHECK_EQ(err.locations().size(), 3);
+    CHECK_EQ(err.locations().at(0).second, "lower limit is defined here");
+    CHECK_EQ(err.locations().at(1).second, "upper limit is defined here");
+    CHECK_EQ(err.locations().at(2).second, "this is not in the range"   );
+}