BAEL-4856 Update test names

libraries-http-2/src/test/java/com/baeldung/okhttp/download/BinaryFileWriterUnitTest.java

@@ -0,0 +1,55 @@
+package com.baeldung.okhttp.download;
+
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.mockito.Mock;
+import org.mockito.junit.MockitoJUnitRunner;
+
+import java.io.InputStream;
+import java.io.OutputStream;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.mockito.ArgumentMatchers.any;
+import static org.mockito.ArgumentMatchers.anyInt;
+import static org.mockito.ArgumentMatchers.eq;
+import static org.mockito.Mockito.mock;
+import static org.mockito.Mockito.times;
+import static org.mockito.Mockito.verify;
+import static org.mockito.Mockito.when;
+
+@RunWith(MockitoJUnitRunner.class)
+public class BinaryFileWriterUnitTest {
+
+  @Mock
+  private OutputStream outputStream;
+
+  @Test
+  public void givenInputStream_whenWrite_thenExpectWritten() throws Exception {
+    InputStream inputStream = mock(InputStream.class);
+    when(inputStream.read(any(), anyInt(), anyInt())).thenReturn(10, -1);
+
+    try (BinaryFileWriter tested = new BinaryFileWriter(outputStream)) {
+      long result = tested.write(inputStream);
+
+      assertEquals(10, result);
+      verify(outputStream).write(any(), eq(0), eq(10));
+      verify(inputStream).close();
+    }
+    verify(outputStream).close();
+  }
+
+  @Test
+  public void givenInputStreamEmpty_whenWrite_thenExpectNotWritten() throws Exception {
+    InputStream inputStream = mock(InputStream.class);
+
+    try (BinaryFileWriter tested = new BinaryFileWriter(outputStream)) {
+      long result = tested.write(inputStream);
+
+      assertEquals(0, result);
+      verify(outputStream, times(0)).write(any(), anyInt(), anyInt());
+      verify(inputStream).close();
+    }
+    verify(outputStream).close();
+  }
+
+}