Add test for #135 (RUST_SCRIPT_BASE_PATH with --base-path)

Author: fornwall

tests/scripts/base-path-tmp.expected

@@ -0,0 +1 @@
+/tmp

tests/scripts/base-path-tmp.script

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+#!/bin/sh
+
+WITHOUT_BASE_PATH=$(rust-script -e 'println!("{}", std::env::var("RUST_SCRIPT_BASE_PATH").unwrap());')
+PWD=$(pwd)
+if [ "$WITHOUT_BASE_PATH" != "$PWD" ]; then
+	echo "Error: Expected $PWD, was $WITHOUT_BASE_PATH"
+fi
+
+rust-script --base-path /tmp -e 'println!("{}", std::env::var("RUST_SCRIPT_BASE_PATH").unwrap());'