Unit tests of BlockBroadcaster (#887)

Signed-off-by: Adrian Sutton <adrian.sutton@consensys.net>

ethereum/eth/src/test/java/tech/pegasys/pantheon/ethereum/eth/sync/BlockBroadcasterTest.java

@@ -0,0 +1,79 @@
+/*
+ * Copyright 2019 ConsenSys AG.
+ *
+ * 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 tech.pegasys.pantheon.ethereum.eth.sync;
+
+import static org.mockito.ArgumentMatchers.any;
+import static org.mockito.Mockito.mock;
+import static org.mockito.Mockito.never;
+import static org.mockito.Mockito.times;
+import static org.mockito.Mockito.verify;
+import static org.mockito.Mockito.when;
+
+import tech.pegasys.pantheon.ethereum.core.Block;
+import tech.pegasys.pantheon.ethereum.core.BlockBody;
+import tech.pegasys.pantheon.ethereum.core.BlockHeaderTestFixture;
+import tech.pegasys.pantheon.ethereum.eth.manager.EthContext;
+import tech.pegasys.pantheon.ethereum.eth.manager.EthPeer;
+import tech.pegasys.pantheon.ethereum.eth.manager.EthPeers;
+import tech.pegasys.pantheon.util.uint.UInt256;
+
+import java.util.Collections;
+import java.util.stream.Stream;
+
+import org.junit.Test;
+
+public class BlockBroadcasterTest {
+
+  @Test
+  public void blockPropagationUnitTest() {
+    final EthPeer ethPeer = mock(EthPeer.class);
+    final EthPeers ethPeers = mock(EthPeers.class);
+    when(ethPeers.availablePeers()).thenReturn(Stream.of(ethPeer));
+
+    final EthContext ethContext = mock(EthContext.class);
+    when(ethContext.getEthPeers()).thenReturn(ethPeers);
+
+    final BlockBroadcaster blockBroadcaster = new BlockBroadcaster(ethContext);
+    final Block block = generateBlock();
+
+    blockBroadcaster.propagate(block, UInt256.ZERO);
+
+    verify(ethPeer, times(1)).propagateBlock(any(), any());
+  }
+
+  @Test
+  public void blockPropagationUnitTestSeenUnseen() {
+    final EthPeer ethPeer0 = mock(EthPeer.class);
+    when(ethPeer0.hasSeenBlock(any())).thenReturn(true);
+
+    final EthPeer ethPeer1 = mock(EthPeer.class);
+
+    final EthPeers ethPeers = mock(EthPeers.class);
+    when(ethPeers.availablePeers()).thenReturn(Stream.of(ethPeer0, ethPeer1));
+
+    final EthContext ethContext = mock(EthContext.class);
+    when(ethContext.getEthPeers()).thenReturn(ethPeers);
+
+    final BlockBroadcaster blockBroadcaster = new BlockBroadcaster(ethContext);
+    final Block block = generateBlock();
+    blockBroadcaster.propagate(block, UInt256.ZERO);
+
+    verify(ethPeer0, never()).propagateBlock(any(), any());
+    verify(ethPeer1, times(1)).propagateBlock(any(), any());
+  }
+
+  private Block generateBlock() {
+    final BlockBody body = new BlockBody(Collections.emptyList(), Collections.emptyList());
+    return new Block(new BlockHeaderTestFixture().buildHeader(), body);
+  }
+}