tests/src/com/android/calculator2/EvaluatorTest.java

/*
 * Copyright (C) 2015 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.android.calculator2;

import junit.framework.AssertionFailedError;
import junit.framework.TestCase;

/**
 * A test for a few static methods in Evaluator.
 * The most interesting one is for unflipZeroes(), which we don't know how to test with
 * real calculator input.
 */
public class EvaluatorTest extends TestCase {
    private static void check(boolean x, String s) {
        if (!x) throw new AssertionFailedError(s);
    }
    public void testUnflipZeroes() {
        check(Evaluator.unflipZeroes("9.99", 2, "9.998", 3).equals("9.998"), "test 1");
        check(Evaluator.unflipZeroes("9.99", 2, "10.0000", 4).equals("9.9999"), "test 2");
        check(Evaluator.unflipZeroes("0.99", 2, "1.00000", 5).equals("0.99999"), "test 3");
        check(Evaluator.unflipZeroes("0.99", 2, "1.00", 2).equals("0.99"), "test 4");
        check(Evaluator.unflipZeroes("10.00", 2, "9.9999", 4).equals("9.9999"), "test 5");
        check(Evaluator.unflipZeroes("-10.00", 2, "-9.9999", 4).equals("-9.9999"), "test 6");
        check(Evaluator.unflipZeroes("-0.99", 2, "-1.00000000000000", 14)
                .equals("-0.99999999999999"), "test 7");
        check(Evaluator.unflipZeroes("12349.99", 2, "12350.00000", 5).equals("12349.99999"),
                "test 8");
        check(Evaluator.unflipZeroes("123.4999", 4, "123.5000000", 7).equals("123.4999999"),
                "test 9");
    }

    public void testGetMsdIndexOf() {
        check(Evaluator.getMsdIndexOf("-0.0234") == 4, "getMsdIndexOf(-0.0234)");
        check(Evaluator.getMsdIndexOf("23.45") == 0, "getMsdIndexOf(23.45)");
        check(Evaluator.getMsdIndexOf("-0.01") == Evaluator.INVALID_MSD, "getMsdIndexOf(-0.01)");
    }

    public void testExponentEnd() {
        check(Evaluator.exponentEnd("xE-2%3", 1) == 4, "exponentEnd(xE-2%3)");
        check(Evaluator.exponentEnd("xE+2%3", 1) == 1, "exponentEnd(xE+2%3)");
        check(Evaluator.exponentEnd("xe2%3", 1) == 1, "exponentEnd(xe2%3)");
        check(Evaluator.exponentEnd("xE123%3", 1) == 5, "exponentEnd(xE123%3)");
        check(Evaluator.exponentEnd("xE123456789%3", 1) == 1, "exponentEnd(xE123456789%3)");
    }
}