begin on test infrastructure

tests/spec/main_spec.rb

@@ -0,0 +1,23 @@
+require "fileutils"
+require "open3"
+
+describe "cxlc" do
+  def run_test(test_name)
+    stdout, stderr, status = Open3.capture3("../build/cxlc", "#{test_name}.cxl")
+    expect(status).to eq(0)
+    stdout, stderr, status = Open3.capture3("gcc", "-o", test_name, "#{test_name}.c")
+    if status != 0
+      $stderr.write(stderr)
+    end
+    expect(status).to eq(0)
+    stdout, stderr, status = Open3.capture3("./#{test_name}")
+    expect(stdout).to eq(File.read("#{test_name}.x"))
+  end
+
+  Dir["*.cxl"].sort.each do |test|
+    test_basename = File.basename(test, ".cxl")
+    it "passes test #{test_basename}" do
+      run_test(test_basename)
+    end
+  end
+end