File src2 = tmpDir.copyResourceFile(Tests.resource(this, "src2.txt"));
Files.copy(src1, new File(srcFiles, "src1.txt"));
Files.copy(src2, new File(srcFiles, "src2.txt"));
MRPipeline p = new MRPipeline(CombineFileIT.class, tmpDir.getDefaultConfiguration());
PCollection<String> in = p.readTextFile(srcFiles.getAbsolutePath());
in.write(To.textFile(outputFiles.getAbsolutePath()));
p.done();
assertEquals(4, outputFiles.listFiles().length);
}