Test hello world example binary can run

PiperOrigin-RevId: 312768125
Change-Id: I69e07f5ad797ae963e1802083f0fb50867a21713

tensorflow/lite/micro/examples/hello_world/BUILD

@@ -91,3 +91,9 @@ cc_binary(
         "//tensorflow/lite/schema:schema_fbs",
     ],
 )
+
+sh_test(
+    name = "hello_world_binary_test",
+    srcs = ["hello_world_binary_test.sh"],
+    data = [":hello_world"],
+)

tensorflow/lite/micro/examples/hello_world/hello_world_binary_test.sh

@@ -0,0 +1,33 @@
+#!/bin/bash
+# Copyright 2020 The TensorFlow Authors. All Rights Reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+# ==============================================================================
+#
+# Bash unit tests for the example binary.
+
+set -e
+
+OUTPUT_LOG_FILE=${TEST_TMPDIR}/output_log.txt
+
+# Needed for copybara compatibility.
+SCRIPT_BASE_DIR=/org_"tensor"flow
+${TEST_SRCDIR}${SCRIPT_BASE_DIR}/tensorflow/lite/micro/examples/hello_world/hello_world   2>&1 | head > ${OUTPUT_LOG_FILE}
+
+if ! grep -q 'x_value:.*y_value:' ${OUTPUT_LOG_FILE}; then
+  echo "ERROR: Expected logs not found in output '${OUTPUT_LOG_FILE}'"
+  exit 1
+fi
+
+echo
+echo "SUCCESS: hello_world_binary_test PASSED"