fix gzip filter on resteasy 3.6.2

scm-core/src/test/java/sonia/scm/filter/GZipResponseFilterTest.java

@@ -0,0 +1,81 @@
+package sonia.scm.filter;
+
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Nested;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.extension.ExtendWith;
+import org.mockito.Mock;
+import org.mockito.junit.jupiter.MockitoExtension;
+
+import javax.ws.rs.core.HttpHeaders;
+import javax.ws.rs.core.MultivaluedMap;
+import javax.ws.rs.ext.WriterInterceptorContext;
+import java.io.ByteArrayOutputStream;
+import java.io.IOException;
+import java.io.OutputStream;
+import java.util.zip.GZIPOutputStream;
+
+import static org.mockito.Mockito.*;
+
+@ExtendWith(MockitoExtension.class)
+class GZipResponseFilterTest {
+
+  @Mock
+  private WriterInterceptorContext context;
+
+  @Mock
+  private MultivaluedMap<String,Object> headers;
+
+  private final GZipResponseFilter filter = new GZipResponseFilter();
+
+  @BeforeEach
+  void setUpContext() {
+    when(context.getHeaders()).thenReturn(headers);
+  }
+
+  @Test
+  void shouldSkipGZipCompression() throws IOException {
+    when(headers.getFirst(HttpHeaders.ACCEPT_ENCODING)).thenReturn("deflate, br");
+
+    filter.aroundWriteTo(context);
+
+    verifySkipped();
+  }
+
+  @Test
+  void shouldSkipGZipCompressionWithoutAcceptEncodingHeader() throws IOException {
+    filter.aroundWriteTo(context);
+
+    verifySkipped();
+  }
+
+  private void verifySkipped() throws IOException {
+    verify(context, never()).getOutputStream();
+    verify(context).proceed();
+  }
+
+
+  @Nested
+  class AcceptGZipEncoding {
+
+    @BeforeEach
+    void setUpContext() {
+      when(headers.getFirst(HttpHeaders.ACCEPT_ENCODING)).thenReturn("gzip, deflate, br");
+      when(context.getOutputStream()).thenReturn(new ByteArrayOutputStream());
+    }
+
+    @Test
+    void shouldEncode() throws IOException {
+      filter.aroundWriteTo(context);
+
+      verify(headers).remove(HttpHeaders.CONTENT_LENGTH);
+      verify(headers).add(HttpHeaders.CONTENT_ENCODING, "gzip");
+
+      verify(context).setOutputStream(any(GZIPOutputStream.class));
+      verify(context, times(2)).setOutputStream(any(OutputStream.class));
+    }
+
+  }
+
+
+}