chore(tests): move tests out of lua directory (#621)

Makefile

@@ -12,7 +12,7 @@ test:
 	@mkdir -p tmp_home
 	@export XDG_DATA_HOME='./tmp_home' && \
 	export XDG_CONFIG_HOME='./tmp_home' && \
-	nvim --headless -u lua/tests/minimal_init.lua -c "lua require'plenary.test_harness'.test_directory( 'lua/tests/', { minimal_init = './lua/tests/minimal_init.lua' })" -c "qa!"
+	bash ./scripts/test_runner.sh
 	@rm -rf tmp_home
 
 # Install luacov & luacov-console from luarocks
@@ -22,7 +22,7 @@ testcov:
 	@export XDG_DATA_HOME=$(realpath './tmp_home/data') && \
 	export XDG_CONFIG_HOME=$(realpath './tmp_home/config') && \
 	export TEST_COV=true && \
-	nvim --headless -u lua/tests/minimal_init.lua -c "lua require'plenary.test_harness'.test_directory( 'lua/tests/', { minimal_init = './lua/tests/minimal_init.lua' })" -c "qa!"
+	bash ./scripts/test_runner.sh
 	@luacov-console lua/
 	@luacov-console -s
 ifeq ($(NOCLEAN), )

scripts/test_runner.sh

@@ -0,0 +1,14 @@
+#!/usr/bin/env bash
+set -e
+
+REPO_DIR=$(git rev-parse --show-toplevel)
+
+nvim_t() {
+	nvim -u "$REPO_DIR/tests/minimal_init.lua" -c "set runtimepath+=$REPO_DIR" "$@"
+}
+
+if [ -n "$1" ]; then
+  nvim_t --headless -c "lua require('plenary.busted').run('$1')"
+else
+  nvim_t --headless -c "lua require'plenary.test_harness'.test_directory( 'tests/', { minimal_init = './tests/minimal_init.lua' })" -c "qa!"
+fi