1 files changed, 100 insertions, 0 deletions
diff --git a/vespajlib/src/test/java/com/yahoo/io/TeeInputStreamTest.java b/vespajlib/src/test/java/com/yahoo/io/TeeInputStreamTest.java
new file mode 100644
index 00000000000..ac438d8645b
--- /dev/null
+++ b/vespajlib/src/test/java/com/yahoo/io/TeeInputStreamTest.java
@@ -0,0 +1,100 @@
+package com.yahoo.io;
+
+import java.io.*;
+import java.nio.charset.StandardCharsets;
+
+import org.junit.Test;
+import static org.hamcrest.Matchers.greaterThan;
+import static org.hamcrest.core.Is.is;
+import static org.junit.Assert.*;
+
+/**
+ * @author arnej
+ */
+public class TeeInputStreamTest {
+
+    @Test
+    public void testSimpleInput() throws IOException {
+        byte[] input = "very simple input".getBytes(StandardCharsets.UTF_8);
+        ByteArrayInputStream in = new ByteArrayInputStream(input);
+        ByteArrayOutputStream gotten = new ByteArrayOutputStream();
+        ByteArrayOutputStream output = new ByteArrayOutputStream();
+
+        TeeInputStream tee = new TeeInputStream(in, gotten);
+        int b = tee.read();
+        assertThat(b, is((int)'v'));
+        output.write(b);
+        assertThat(gotten.toString(), is("very simple input"));
+        for (int i = 0; i < 16; i++) {
+            b = tee.read();
+            // System.out.println("got["+i+"]: "+(char)b);
+            assertThat(b, is(greaterThan(0)));
+            output.write(b);
+        }
+        assertThat(tee.read(), is(-1));
+        assertThat(gotten.toString(), is("very simple input"));
+        assertThat(output.toString(), is("very simple input"));
+    }
+
+    private class Generator implements Runnable {
+        private OutputStream dst;
+        public Generator(OutputStream dst) { this.dst = dst; }
+        @Override
+        public void run() {
+            for (int i = 0; i < 123456789; i++) {
+                int b = i & 0x7f;
+                if (b < 32) continue;
+                if (b > 126) b = '\n';
+                try {
+                    dst.write(b);
+                } catch (IOException e) {
+                    return;
+                }
+            }
+        }
+    }
+
+    @Test
+    public void testPipedInput() throws IOException {
+        PipedOutputStream input = new PipedOutputStream();
+        PipedInputStream in = new PipedInputStream(input);
+        ByteArrayOutputStream gotten = new ByteArrayOutputStream();
+        ByteArrayOutputStream output = new ByteArrayOutputStream();
+        TeeInputStream tee = new TeeInputStream(in, gotten);
+        input.write("first input".getBytes(StandardCharsets.UTF_8));
+        int b = tee.read();
+        assertThat(b, is((int)'f'));
+        output.write(b);
+        assertThat(gotten.toString(), is("first input"));
+        input.write(" second input".getBytes(StandardCharsets.UTF_8));
+        b = tee.read();
+        assertThat(b, is((int)'i'));
+        output.write(b);
+        assertThat(gotten.toString(), is("first input second input"));
+        new Thread(new Generator(input)).start();
+        b = tee.read();
+        assertThat(b, is((int)'r'));
+        output.write(b);
+        byte[] ba = new byte[9];
+        for (int i = 0; i < 12345; i++) {
+            b = tee.read();
+            // System.out.println("got["+i+"]: "+(char)b);
+            assertThat(b, is(greaterThan(0)));
+            output.write(b);
+            int l = tee.read(ba);
+            assertThat(l, is(greaterThan(0)));
+            output.write(ba, 0, l);
+            l = tee.read(ba, 3, 3);
+            assertThat(l, is(greaterThan(0)));
+            output.write(ba, 3, l);
+        }
+        tee.close();
+        String got = gotten.toString();
+        // System.out.println("got length: "+got.length());
+        // System.out.println("output length: "+output.toString().length());
+        // System.out.println("got: "+got);
+        assertThat(got.length(), is(greaterThan(34567)));
+        assertTrue(got.startsWith(output.toString()));
+    }
+
+}