add "test" rake task and initial test case

Makefile

@@ -1,4 +1,7 @@
+.PHONY: default
 default:
-
-%:
+	rake $@
+
+.PHONY: test
+test:
 	rake $@

Rakefile.rb

@@ -5,6 +5,7 @@ require "rake/clean"
 require "rscons"
 
 NAME = "jes"
+GTEST_VERSION = "1.7.0"
 
 task :library do
   Rscons::Environment.new do |env|
@@ -14,6 +15,22 @@ task :library do
   end
 end
 
+task :test => :library do
+  Rscons::Environment.new do |env|
+    env.build_root = "build"
+    env["CPPPATH"] << "src/lib/include"
+    env["CPPPATH"] << "gtest-#{GTEST_VERSION}/include"
+    env["CPPPATH"] << "gtest-#{GTEST_VERSION}"
+    env["LIBS"] << NAME
+    env["LIBPATH"] << env.build_root
+    sources = Dir["gtest-#{GTEST_VERSION}/src/gtest-all.cc",
+                  "gtest-#{GTEST_VERSION}/src/gtest_main.cc",
+                  "test/src/**/*.cc"]
+    env.Program("build/tests", sources)
+  end
+  system("./build/tests")
+end
+
 task :default => [:library]
 
 task :clean do

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());
+}