add tests for cat

cmd/hdfs/test/cat.bats

@@ -0,0 +1,25 @@
+#!/usr/bin/env bats
+
+load helper
+
+@test "cat" {
+  run $HDFS cat /_test/foo.txt
+  assert_success
+  assert_output "bar"
+}
+
+@test "cat long" {
+  run bash -c "$HDFS cat /_test/mobydick.txt > $BATS_TMPDIR/mobydick.txt"
+  assert_success
+
+  SHA=`shasum < mobydick.txt | awk '{ print $1 }'`
+  assert_equal $SHA `shasum < $BATS_TMPDIR/mobydick.txt | awk '{ print $1 }'`
+}
+
+@test "cat nonexistent" {
+  run $HDFS cat /_test_cmd/nonexistent
+  assert_failure
+  assert_output <<OUT
+open /_test_cmd/nonexistent: file does not exist
+OUT
+}

cmd/hdfs/test/helper.bash

@@ -1,7 +1,8 @@
 #!/bin/bash
 
 export HADOOP_FS="$HADOOP_HOME/bin/hadoop fs -Ddfs.block.size=1048576"
-export HDFS="$BATS_TEST_DIRNAME/../../../hdfs"
+export ROOT_TEST_DIR="$BATS_TEST_DIRNAME/../../.."
+export HDFS="$ROOT_TEST_DIR/hdfs"
 
 # stolen from https://github.com/sstephenson/rbenv/blob/master/test/test_helper.bash