75 lines
2.0 KiB
Java
75 lines
2.0 KiB
Java
package com.iluwatar.execute.around;
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import org.junit.Assert;
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import org.junit.Rule;
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import org.junit.Test;
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import org.junit.rules.TemporaryFolder;
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import java.io.File;
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import java.io.IOException;
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import java.nio.file.Files;
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import static org.junit.Assert.assertFalse;
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import static org.junit.Assert.assertTrue;
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/**
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* Date: 12/12/15 - 3:21 PM
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*
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* @author Jeroen Meulemeester
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*/
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public class SimpleFileWriterTest {
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/**
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* Create a temporary folder, used to generate files in during this test
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*/
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@Rule
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public final TemporaryFolder testFolder = new TemporaryFolder();
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/**
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* Verify if the given writer is not 'null'
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*/
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@Test
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public void testWriterNotNull() throws Exception {
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final File temporaryFile = this.testFolder.newFile();
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new SimpleFileWriter(temporaryFile.getPath(), Assert::assertNotNull);
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}
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/**
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* Test if the {@link SimpleFileWriter} creates a file if it doesn't exist
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*/
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@Test
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public void testNonExistentFile() throws Exception {
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final File nonExistingFile = new File(this.testFolder.getRoot(), "non-existing-file");
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assertFalse(nonExistingFile.exists());
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new SimpleFileWriter(nonExistingFile.getPath(), Assert::assertNotNull);
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assertTrue(nonExistingFile.exists());
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}
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/**
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* Test if the data written to the file writer actually gets in the file
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*/
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@Test
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public void testActualWrite() throws Exception {
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final String testMessage = "Test message";
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final File temporaryFile = this.testFolder.newFile();
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assertTrue(temporaryFile.exists());
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new SimpleFileWriter(temporaryFile.getPath(), writer -> writer.write(testMessage));
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assertTrue(Files.lines(temporaryFile.toPath()).allMatch(testMessage::equals));
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}
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/**
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* Verify if an {@link IOException} during the write ripples through
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*/
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@Test(expected = IOException.class)
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public void testIoException() throws Exception {
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final File temporaryFile = this.testFolder.newFile();
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new SimpleFileWriter(temporaryFile.getPath(), writer -> {
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throw new IOException("");
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});
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}
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}
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