Implementation, tests and first use of rangechecked_cast

tests/pglabtests/pglabtests.pro

@@ -20,6 +20,7 @@ SOURCES +=     main.cpp \
     tst_escapeConnectionStringValue.cpp \
     tst_expected.cpp \
     tst_SqlLexer.cpp \
+    tst_rangechecked_cast.cpp \
     tst_scopeguard.cpp \
     tst_CsvWriter.cpp \
     tst_PasswordManager.cpp \

tests/pglabtests/tst_rangechecked_cast.cpp

@@ -0,0 +1,35 @@
+#include <gtest/gtest.h>
+#include <gmock/gmock-matchers.h>
+#include "rangechecked_cast.h"
+#include "PrintTo_Qt.h"
+
+using namespace testing;
+
+
+TEST(rangechecked_cast, in_range)
+{
+	ASSERT_NO_THROW({
+		int8_t in = 42;
+		int expected = 42;
+		auto output = rangechecked_cast<int>(in);
+		ASSERT_EQ(output, expected);
+	});
+}
+
+TEST(rangechecked_cast, above_max)
+{
+	int64_t in = std::numeric_limits<int>::max() + static_cast<int64_t>(1);
+	ASSERT_THROW({
+		rangechecked_cast<int>(in);
+	},
+	std::runtime_error);
+}
+
+TEST(rangechecked_cast, below_lowest)
+{
+	int64_t in = std::numeric_limits<int>::lowest() - static_cast<int64_t>(1);
+	ASSERT_THROW({
+		rangechecked_cast<int>(in);
+	},
+	std::runtime_error);
+}