add "test" rake task and initial test case

test/src/test_FileReader.cc

@@ -0,0 +1,10 @@
+#include "gtest/gtest.h"
+#include "jes/FileReader.h"
+
+using namespace jes;
+
+TEST(FileReaderTest, num_lines_defaults_to_0)
+{
+    FileReader fr;
+    EXPECT_EQ(0, fr.num_lines());
+}