#121: bug

src/test/java/org/cactoos/io/TeeInputStreamTest.java

@@ -0,0 +1,81 @@
+/**
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2017 Yegor Bugayenko
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included
+ * in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+package org.cactoos.io;
+
+import java.io.ByteArrayInputStream;
+import java.io.ByteArrayOutputStream;
+import java.io.IOException;
+import java.io.InputStream;
+import java.nio.charset.StandardCharsets;
+import org.hamcrest.MatcherAssert;
+import org.hamcrest.Matchers;
+import org.junit.Test;
+
+/**
+ * Test case for {@link TeeInputStream}.
+ * @author Yegor Bugayenko ([email protected])
+ * @version $Id$
+ * @since 0.1
+ * @checkstyle JavadocMethodCheck (500 lines)
+ * @checkstyle ClassDataAbstractionCouplingCheck (500 lines)
+ */
+public final class TeeInputStreamTest {
+
+    @Test
+    public void copiesContentByteByByte() throws IOException {
+        final ByteArrayOutputStream baos = new ByteArrayOutputStream();
+        final String content = "Hello, товарищ!";
+        MatcherAssert.assertThat(
+            "Can't copy InputStream to OutputStream byte by byte",
+            TeeInputStreamTest.asString(
+                new TeeInputStream(
+                    new ByteArrayInputStream(
+                        content.getBytes(StandardCharsets.UTF_8)
+                    ),
+                    baos
+                )
+            ),
+            Matchers.allOf(
+                Matchers.equalTo(content),
+                Matchers.equalTo(
+                    new String(baos.toByteArray(), StandardCharsets.UTF_8)
+                )
+            )
+        );
+    }
+
+    private static String asString(final InputStream input) throws IOException {
+        final ByteArrayOutputStream baos = new ByteArrayOutputStream();
+        while (true) {
+            final int data = input.read();
+            if (data < 0) {
+                break;
+            }
+            baos.write(data);
+        }
+        input.close();
+        return new String(baos.toByteArray(), StandardCharsets.UTF_8);
+    }
+
+}