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Diffstat (limited to 'jimfs/src/test/java/com/google/common/jimfs/JimfsInputStreamTest.java')
-rw-r--r-- | jimfs/src/test/java/com/google/common/jimfs/JimfsInputStreamTest.java | 240 |
1 files changed, 240 insertions, 0 deletions
diff --git a/jimfs/src/test/java/com/google/common/jimfs/JimfsInputStreamTest.java b/jimfs/src/test/java/com/google/common/jimfs/JimfsInputStreamTest.java new file mode 100644 index 0000000..94cc5f4 --- /dev/null +++ b/jimfs/src/test/java/com/google/common/jimfs/JimfsInputStreamTest.java @@ -0,0 +1,240 @@ +/* + * Copyright 2013 Google Inc. + * + * 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.google.common.jimfs; + +import static com.google.common.jimfs.TestUtils.bytes; +import static com.google.common.jimfs.TestUtils.regularFile; +import static com.google.common.truth.Truth.assertThat; +import static org.junit.Assert.assertArrayEquals; +import static org.junit.Assert.fail; + +import com.google.common.util.concurrent.Runnables; +import java.io.IOException; +import org.junit.Test; +import org.junit.runner.RunWith; +import org.junit.runners.JUnit4; + +/** + * Tests for {@link JimfsInputStream}. + * + * @author Colin Decker + */ +@RunWith(JUnit4.class) +@SuppressWarnings("ResultOfMethodCallIgnored") +public class JimfsInputStreamTest { + + @Test + public void testRead_singleByte() throws IOException { + JimfsInputStream in = newInputStream(2); + assertThat(in.read()).isEqualTo(2); + assertEmpty(in); + } + + @Test + public void testRead_wholeArray() throws IOException { + JimfsInputStream in = newInputStream(1, 2, 3, 4, 5, 6, 7, 8); + byte[] bytes = new byte[8]; + assertThat(in.read(bytes)).isEqualTo(8); + assertArrayEquals(bytes(1, 2, 3, 4, 5, 6, 7, 8), bytes); + assertEmpty(in); + } + + @Test + public void testRead_wholeArray_arrayLarger() throws IOException { + JimfsInputStream in = newInputStream(1, 2, 3, 4, 5, 6, 7, 8); + byte[] bytes = new byte[12]; + assertThat(in.read(bytes)).isEqualTo(8); + assertArrayEquals(bytes(1, 2, 3, 4, 5, 6, 7, 8, 0, 0, 0, 0), bytes); + assertEmpty(in); + } + + @Test + public void testRead_wholeArray_arraySmaller() throws IOException { + JimfsInputStream in = newInputStream(1, 2, 3, 4, 5, 6, 7, 8); + byte[] bytes = new byte[6]; + assertThat(in.read(bytes)).isEqualTo(6); + assertArrayEquals(bytes(1, 2, 3, 4, 5, 6), bytes); + bytes = new byte[6]; + assertThat(in.read(bytes)).isEqualTo(2); + assertArrayEquals(bytes(7, 8, 0, 0, 0, 0), bytes); + assertEmpty(in); + } + + @Test + public void testRead_partialArray() throws IOException { + JimfsInputStream in = newInputStream(1, 2, 3, 4, 5, 6, 7, 8); + byte[] bytes = new byte[12]; + assertThat(in.read(bytes, 0, 8)).isEqualTo(8); + assertArrayEquals(bytes(1, 2, 3, 4, 5, 6, 7, 8, 0, 0, 0, 0), bytes); + assertEmpty(in); + } + + @Test + public void testRead_partialArray_sliceLarger() throws IOException { + JimfsInputStream in = newInputStream(1, 2, 3, 4, 5, 6, 7, 8); + byte[] bytes = new byte[12]; + assertThat(in.read(bytes, 0, 10)).isEqualTo(8); + assertArrayEquals(bytes(1, 2, 3, 4, 5, 6, 7, 8, 0, 0, 0, 0), bytes); + assertEmpty(in); + } + + @Test + public void testRead_partialArray_sliceSmaller() throws IOException { + JimfsInputStream in = newInputStream(1, 2, 3, 4, 5, 6, 7, 8); + byte[] bytes = new byte[12]; + assertThat(in.read(bytes, 0, 6)).isEqualTo(6); + assertArrayEquals(bytes(1, 2, 3, 4, 5, 6, 0, 0, 0, 0, 0, 0), bytes); + assertThat(in.read(bytes, 6, 6)).isEqualTo(2); + assertArrayEquals(bytes(1, 2, 3, 4, 5, 6, 7, 8, 0, 0, 0, 0), bytes); + assertEmpty(in); + } + + @Test + public void testRead_partialArray_invalidInput() throws IOException { + JimfsInputStream in = newInputStream(1, 2, 3, 4, 5); + + try { + in.read(new byte[3], -1, 1); + fail(); + } catch (IndexOutOfBoundsException expected) { + } + + try { + in.read(new byte[3], 0, 4); + fail(); + } catch (IndexOutOfBoundsException expected) { + } + + try { + in.read(new byte[3], 1, 3); + fail(); + } catch (IndexOutOfBoundsException expected) { + } + } + + @Test + public void testAvailable() throws IOException { + JimfsInputStream in = newInputStream(1, 2, 3, 4, 5, 6, 7, 8); + assertThat(in.available()).isEqualTo(8); + assertThat(in.read()).isEqualTo(1); + assertThat(in.available()).isEqualTo(7); + assertThat(in.read(new byte[3])).isEqualTo(3); + assertThat(in.available()).isEqualTo(4); + assertThat(in.read(new byte[10], 1, 2)).isEqualTo(2); + assertThat(in.available()).isEqualTo(2); + assertThat(in.read(new byte[10])).isEqualTo(2); + assertThat(in.available()).isEqualTo(0); + } + + @Test + public void testSkip() throws IOException { + JimfsInputStream in = newInputStream(1, 2, 3, 4, 5, 6, 7, 8); + assertThat(in.skip(0)).isEqualTo(0); + assertThat(in.skip(-10)).isEqualTo(0); + assertThat(in.skip(2)).isEqualTo(2); + assertThat(in.read()).isEqualTo(3); + assertThat(in.skip(3)).isEqualTo(3); + assertThat(in.read()).isEqualTo(7); + assertThat(in.skip(10)).isEqualTo(1); + assertEmpty(in); + assertThat(in.skip(10)).isEqualTo(0); + assertEmpty(in); + } + + @SuppressWarnings("GuardedByChecker") + @Test + public void testFullyReadInputStream_doesNotChangeStateWhenStoreChanges() throws IOException { + JimfsInputStream in = newInputStream(1, 2, 3, 4, 5); + assertThat(in.read(new byte[5])).isEqualTo(5); + assertEmpty(in); + + in.file.write(5, new byte[10], 0, 10); // append more bytes to file + assertEmpty(in); + } + + @Test + public void testMark_unsupported() throws IOException { + JimfsInputStream in = newInputStream(1, 2, 3); + assertThat(in.markSupported()).isFalse(); + + // mark does nothing + in.mark(1); + + try { + // reset throws IOException when unsupported + in.reset(); + fail(); + } catch (IOException expected) { + } + } + + @Test + public void testClosedInputStream_throwsException() throws IOException { + JimfsInputStream in = newInputStream(1, 2, 3); + in.close(); + + try { + in.read(); + fail(); + } catch (IOException expected) { + } + + try { + in.read(new byte[3]); + fail(); + } catch (IOException expected) { + } + + try { + in.read(new byte[10], 0, 2); + fail(); + } catch (IOException expected) { + } + + try { + in.skip(10); + fail(); + } catch (IOException expected) { + } + + try { + in.available(); + fail(); + } catch (IOException expected) { + } + + in.close(); // does nothing + } + + private static JimfsInputStream newInputStream(int... bytes) throws IOException { + byte[] b = new byte[bytes.length]; + for (int i = 0; i < bytes.length; i++) { + b[i] = (byte) bytes[i]; + } + + RegularFile file = regularFile(0); + file.write(0, b, 0, b.length); + return new JimfsInputStream(file, new FileSystemState(Runnables.doNothing())); + } + + private static void assertEmpty(JimfsInputStream in) throws IOException { + assertThat(in.read()).isEqualTo(-1); + assertThat(in.read(new byte[3])).isEqualTo(-1); + assertThat(in.read(new byte[10], 1, 5)).isEqualTo(-1); + assertThat(in.available()).isEqualTo(0); + } +} |