moved shebang to top
.. otherwise shebang won't be taken into account and the script will run in the default shell.
When I ran the original script, it ran on my zsh and produced errors (Ubuntu/Linux).
Moving shebang to the top fixes the issue as the script run in bash as expected.
diff --git a/tests/run_tests.sh b/tests/run_tests.sh
index d5d5db1..a56e023 100755
--- a/tests/run_tests.sh
+++ b/tests/run_tests.sh
@@ -1,3 +1,5 @@
+#!/bin/bash
+
# Copyright 2018 The Android Open Source Project
#
# Licensed under the Apache License, Version 2.0 (the "License");
@@ -42,8 +44,6 @@
#
################################################
-#!/bin/bash
-
# Directories, paths and filenames
BUILD_DIR=build
CMAKE=cmake
