[Testing/CI] Added 'bats' test system for bash

.gitmodules

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+[submodule "test/test_helper/bats-core"]
+	path = test/test_helper/bats-core
+	url = https://github.com/bats-core/bats-core
+[submodule "test/test_helper/bats-assert"]
+	path = test/test_helper/bats-assert
+	url = https://github.com/bats-core/bats-assert
+[submodule "test/test_helper/bats-support"]
+	path = test/test_helper/bats-support
+	url = https://github.com/bats-core/bats-support
+[submodule "test/test_helper/bats-file"]
+	path = test/test_helper/bats-file
+	url = https://github.com/bats-core/bats-file

test/test_helper/bats-assert

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+Subproject commit 0a8dd57e2cc6d4cc064b1ed6b4e79b9f7fee096f

test/test_helper/bats-core

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+Subproject commit 7f0b3461fbec996c1be47f5f9993fd7f9f317804

test/test_helper/bats-file

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+Subproject commit 17fa557f6fe28a327933e3fa32efef1d211caa5a

test/test_helper/bats-support

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+Subproject commit d140a65044b2d6810381935ae7f0c94c7023c8c3