Add more coverage

src/main/java/org/kohsuke/github/connector/GitHubConnectorResponse.java

@@ -113,4 +113,25 @@ public Map<String, List<String>> allHeaders() {
         return headers;
     }
 
+    /**
+     * Unwraps a {@link GitHubConnectorResponse} from a {@link HttpURLConnection} adapter.
+     *
+     * Only works on the internal {@link GitHubConnectorResponseHttpUrlConnectionAdapter}.
+     *
+     * @param connection
+     *            the connection to unwrap.
+     * @return an unwrapped response from an adapter.
+     * @throws UnsupportedOperationException
+     *             if the connection is not an adapter.
+     * @deprecated Only preset for testing and interaction with deprecated HttpURLConnection components.
+     */
+    @Deprecated
+    public final static GitHubConnectorResponse fromHttpURLConnectionAdapter(HttpURLConnection connection) {
+        if (connection instanceof GitHubConnectorResponseHttpUrlConnectionAdapter) {
+            return ((GitHubConnectorResponseHttpUrlConnectionAdapter) connection).connectorResponse();
+        } else {
+            throw new UnsupportedOperationException(
+                    "Cannot unwrap GitHubConnectorResponse from " + connection.getClass().getName());
+        }
+    }
 }

src/main/java/org/kohsuke/github/connector/GitHubConnectorResponseHttpUrlConnectionAdapter.java

@@ -9,6 +9,14 @@
 import java.security.Permission;
 import java.util.*;
 
+/**
+ * Adapter class for {@link org.kohsuke.github.connector.GitHubConnectorResponse} to be usable as a
+ * {@link HttpURLConnection}.
+ *
+ * Behavior is equivalent to a {@link HttpURLConnection} after {@link HttpURLConnection#connect()} has been called.
+ * Methods that make no sense throw {@link UnsupportedOperationException}.
+ */
+@Deprecated
 class GitHubConnectorResponseHttpUrlConnectionAdapter extends HttpURLConnection {
 
     private final GitHubConnectorResponse connectorResponse;
@@ -19,6 +27,16 @@ public GitHubConnectorResponseHttpUrlConnectionAdapter(GitHubConnectorResponse c
         this.connectorResponse = connectorResponse;
     }
 
+    /**
+     * Readable to support {@link GitHubConnectorResponse#fromHttpURLConnectionAdapter(HttpURLConnection)} which only
+     * exist for testing.
+     *
+     * @return
+     */
+    GitHubConnectorResponse connectorResponse() {
+        return connectorResponse;
+    }
+
     @Override
     public String getHeaderFieldKey(int n) {
         List<String> keys = new ArrayList<>(connectorResponse.allHeaders().keySet());

src/main/java/org/kohsuke/github/internal/GitHubConnectorHttpConnectorAdapter.java

@@ -193,6 +193,9 @@ public InputStream bodyStream() throws IOException {
             return inputBytes == null ? null : new ByteArrayInputStream(inputBytes);
         }
 
+        /**
+         * {@inheritDoc}
+         */
         @SuppressFBWarnings(value = { "EI_EXPOSE_REP" },
                 justification = "Internal implementation class. Should not be used externally.")
         @Nonnull

src/test/java/org/kohsuke/github/AbuseLimitHandlerTest.java

@@ -5,6 +5,7 @@
 import org.hamcrest.Matchers;
 import org.junit.Assert;
 import org.junit.Test;
+import org.kohsuke.github.connector.GitHubConnectorResponse;
 
 import java.io.IOException;
 import java.io.InputStream;
@@ -59,6 +60,13 @@ public void testHandler_Fail() throws Exception {
                     @Override
                     public void onError(IOException e, HttpURLConnection uc) throws IOException {
 
+                        GitHubConnectorResponse connectorResponse = null;
+                        try {
+                            connectorResponse = GitHubConnectorResponse.fromHttpURLConnectionAdapter(uc);
+                        } catch (UnsupportedOperationException ex) {
+                            assertThat(ex.getMessage(), startsWith("Cannot unwrap GitHubConnectorResponse"));
+                        }
+
                         // Verify
                         assertThat(uc.getDate(), Matchers.greaterThanOrEqualTo(new Date().getTime() - 10000));
                         assertThat(uc.getExpiration(), equalTo(0L));
@@ -87,6 +95,12 @@ public void onError(IOException e, HttpURLConnection uc) throws IOException {
                         String error = IOUtils.toString(errorStream, StandardCharsets.UTF_8);
                         assertThat(error, containsString("Must have push access to repository"));
 
+                        if (connectorResponse != null) {
+                            String connectorBody = IOUtils.toString(connectorResponse.bodyStream(),
+                                    StandardCharsets.UTF_8);
+                            assertThat(connectorBody, containsString("Must have push access to repository"));
+                        }
+
                         // calling again should still error
                         ioEx = Assert.assertThrows(IOException.class, () -> uc.getInputStream());
 
@@ -116,12 +130,10 @@ public void onError(IOException e, HttpURLConnection uc) throws IOException {
                         Assert.assertThrows(IllegalStateException.class, () -> uc.setRequestProperty("bogus", "thing"));
                         Assert.assertThrows(IllegalStateException.class, () -> uc.setUseCaches(true));
 
-                        boolean isAdapter = false;
-                        if (uc.toString().contains("GitHubConnectorResponseHttpUrlConnectionAdapter")) {
-                            isAdapter = true;
-                        }
+                        if (connectorResponse != null) {
+                            assertThat(uc.toString(),
+                                    containsString("GitHubConnectorResponseHttpUrlConnectionAdapter"));
 
-                        if (isAdapter) {
                             Assert.assertThrows(UnsupportedOperationException.class,
                                     () -> uc.getAllowUserInteraction());
                             Assert.assertThrows(UnsupportedOperationException.class, () -> uc.getConnectTimeout());