package testutil;

import static function.builtin.EVAL.eval;
import static org.junit.Assert.*;

import java.io.*;

import parser.LispParser;
import sexpression.SExpression;

public final class TestUtilities {

    public static InputStream createInputStreamFromString(String string) {
        return new ByteArrayInputStream(string.getBytes());
    }

    public static InputStream createIOExceptionThrowingInputStream() {
        return new InputStream() {

            public int read() throws IOException {
                throw new IOException("test IOException");
            }
        };
    }

    public static SExpression evaluateString(String input) {
        return eval(parseString(input));
    }

    public static SExpression parseString(String input) {
        InputStream stringInputStream = TestUtilities.createInputStreamFromString(input);

        return new LispParser(stringInputStream, "testFile").getNextSExpression();
    }

    public static void assertSExpressionsMatch(SExpression one, SExpression two) {
        assertEquals(one.toString(), two.toString());
    }

    public static void assertSExpressionsDoNotMatch(SExpression one, SExpression two) {
        assertNotEquals(one.toString(), two.toString());
    }

}