UnitTests: Add build script and move current tests to "tests/Engine" directory (from "tests/Nazara")

Former-commit-id: 5639305bbdbb69ad6f6f282df6c6de930220b57f

tests/Engine/Core/File.cpp

@@ -0,0 +1,53 @@
+#include <Nazara/Core/File.hpp>
+#include <Catch/catch.hpp>
+
+SCENARIO("File", "[CORE][FILE]")
+{
+	GIVEN("One file")
+	{
+		WHEN("We create a new file")
+		{
+			NzFile file("Test File.txt", nzOpenMode_ReadWrite);
+			REQUIRE(file.GetDirectory() == NzDirectory::GetCurrent() + NAZARA_DIRECTORY_SEPARATOR);
+			CHECK(file.IsOpen());
+
+			THEN("We are allowed to write 3 times 'Test String'")
+			{
+				const char message[12] = "Test String"; // 11 + '\0'
+				NzByteArray byteArray(message, 11);
+				file.Write("Test String");
+				file.Write(byteArray);
+				file.Write(message, sizeof(char), 11);
+			}
+
+			AND_THEN("We can retrieve 3 times 'Test String'")
+			{
+				char message[12];
+				REQUIRE(file.Read(message, 11) == 11);
+				message[11] = '\0';
+				REQUIRE(NzString(message) == "Test String");
+
+				REQUIRE(file.Read(message, sizeof(char), 11) == 11);
+				message[11] = '\0';
+				REQUIRE(NzString(message) == "Test String");
+			}
+
+			AND_THEN("We close it")
+			{
+				file.Close();
+				REQUIRE(file.GetSize() == 33U);
+				CHECK(!file.IsOpen());
+			}
+		}
+
+		WHEN("We delete this file")
+		{
+			NzFile::Delete("Test File.txt");
+
+			THEN("It doesn't exist anymore")
+			{
+				CHECK(!NzFile::Exists("Test File.txt"));
+			}
+		}
+	}
+}