tests/src/com/android/libraries/entitlement/utils/StreamUtilsTest.java

/*
 * Copyright (C) 2021 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.libraries.entitlement.utils;

import static com.google.common.truth.Truth.assertThat;

import static org.mockito.Mockito.any;
import static org.mockito.Mockito.mock;
import static org.mockito.Mockito.when;
import static org.testng.Assert.assertThrows;

import static java.nio.charset.StandardCharsets.UTF_8;

import androidx.test.runner.AndroidJUnit4;

import org.junit.Test;
import org.junit.runner.RunWith;

import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;

@RunWith(AndroidJUnit4.class)
public class StreamUtilsTest {
    @Test
    public void inputStreamToString() throws Exception {
        String expectedString = "expected";
        InputStream inputStream = new ByteArrayInputStream(expectedString.getBytes(UTF_8));

        String resultString = StreamUtils.inputStreamToString(inputStream);

        assertThat(resultString).isEqualTo(expectedString);
    }

    @Test
    public void inputStreamToString_nullInputStream_shouldThrowException() throws Exception {
        assertThrows(IOException.class, () -> StreamUtils.inputStreamToString(null));
    }

    @Test
    public void inputStreamToString_readThrowsIOException_shouldThrowException() throws Exception {
        InputStream inputStream = mock(InputStream.class);
        when(inputStream.read(any())).thenThrow(new IOException());

        assertThrows(IOException.class, () -> StreamUtils.inputStreamToString(inputStream));
    }

    @Test
    public void inputStreamToStringSafe() throws Exception {
        String expectedString = "expected";
        InputStream inputStream = new ByteArrayInputStream(expectedString.getBytes(UTF_8));

        String resultString = StreamUtils.inputStreamToStringSafe(inputStream);

        assertThat(resultString).isEqualTo(expectedString);
    }

    @Test
    public void inputStreamToStringSafe_nullInputStream_shouldReturnEmpty() throws Exception {
        String resultString = StreamUtils.inputStreamToStringSafe(null);

        assertThat(resultString).isEmpty();
    }

    @Test
    public void inputStreamToStringSafe_readThrowsIOException_shouldReturnEmpty() throws Exception {
        InputStream inputStream = mock(InputStream.class);
        when(inputStream.read(any())).thenThrow(new IOException());

        String resultString = StreamUtils.inputStreamToStringSafe(inputStream);

        assertThat(resultString).isEmpty();
    }
}