Add basic test

README.org

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+Run tests with:
+
+: runtest --tool jlox --srcdir testsuite

jlox

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+#!/usr/bin/env sh
+
+/usr/bin/java -jar src/_build/com/craftinginterpreters/lox/Lox.jar

testsuite/jlox.tests/tests.exp

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+set test_name "Printing"
+set command_line "./jlox"
+
+spawn $command_line
+send "print \"Hello, world!\";\n"
+
+expect {
+    "Error at" { fail "$test_name: error: $expect_out(buffer)\n" }
+    "> Hello, world!" { pass "$test_name" }
+    eof { fail "$test_name: Premature end of file: $expect_out(buffer)\n" }
+    timeout { fail "$test_name: timed out\n" }
+}
+
+
+set test_name "Local Functions and Closures"
+
+spawn $command_line
+send "fun makeCounter() { var i = 0; fun count() { i = i + 1; print i; } return count; }
+var counter = makeCounter();
+counter();
+counter();
+"
+
+expect {
+    "Error at" { fail "$test_name: error: $expect_out(buffer)\n" }
+    -re "> 1.*?> 2" { pass "$test_name" }
+    eof { fail "$test_name: Premature end of file: $expect_out(buffer)\n" }
+    timeout { fail "$test_name: timed out\n" }
+}