assertThat(network.outDegree(N1)).isEqualTo(2);
  }

  // Element Mutation

  @Test
  public void addEdge_existingNodes() {
    assume().that(graphIsMutable()).isTrue();

    // Adding nodes initially for safety (insulating from possible future
    // modifications to proxy methods)
    addNode(N1);
    addNode(N2);
    assertThat(networkAsMutableNetwork.addEdge(N1, N2, E12)).isTrue();

    assertThat(network.outDegree(N1)).isEqualTo(2);
  }

  // Element Mutation

  @Test
  public void addEdge_existingNodes() {
    assume().that(graphIsMutable()).isTrue();

    // Adding nodes initially for safety (insulating from possible future
    // modifications to proxy methods)
    addNode(N1);
    addNode(N2);
    assertThat(networkAsMutableNetwork.addEdge(N1, N2, E12)).isTrue();

        when(fileHandle.acquire()).thenReturn(fileHandle);
        when(fileHandle.isValid()).thenReturn(true);
        when(fileHandle.getTree()).thenReturn(tree);

        // Initially not open (isStale returns false when handle is null, not true)
        assertFalse(target.isOpen());
        assertFalse(target.isStale());

        // After ensureOpen, handle valid -> open

    putEdge(1, 2);
    putEdge(3, 1);
  }

  // Element Mutation

  @Test
  public void putEdge_existingNodes() {
    assume().that(graphIsMutable()).isTrue();

    // Adding nodes initially for safety (insulating from possible future
    // modifications to proxy methods)
    addNode(N1);
    addNode(N2);

    assertThat(graphAsMutableGraph.putEdge(N1, N2)).isTrue();
  }

  @Test

        String sessionId = "rotation-test";
        keyManager.storeSessionKey(sessionId, testKey, "AES");

        // Initial version should be 0
        assertEquals(0, keyManager.getKeyVersion(sessionId), "Initial version should be 0");

        // Rotate key
        int newVersion = keyManager.rotateSessionKey(sessionId);
        assertEquals(1, newVersion, "New version should be 1");

    }

    @Test
    public void nextElement_firstCall_flipsIsPrimary() {
        DummyResponse d = new DummyResponse();
        // Initially isPrimary is true (inherited constructor)
        SmbComTransactionResponse r1 = (SmbComTransactionResponse) d.nextElement();
        assertSame(d, r1, "nextElement should return the same instance");

            assertNotNull(initialState, "Initial state should not be null");
            assertTrue(
                    initialState == RdmaConnection.RdmaConnectionState.DISCONNECTED
                            || initialState == RdmaConnection.RdmaConnectionState.CONNECTING,
                    "Initial state should be DISCONNECTED or CONNECTING");

            // Test connection properties

    void testBufDataStartInitialization() throws Exception {
        byte[] buffer = new byte[100];
        int bufferIndex = 0;

        // Set bufDataStart to 0 initially
        Field bufDataStartField = response.getClass().getSuperclass().getSuperclass().getDeclaredField("bufDataStart");
        bufDataStartField.setAccessible(true);
        bufDataStartField.set(response, 0);

        assertTrue(rateLimiter.checkAttempt("user1", "192.168.1.9"), "Should still track account");
    }

    @Test
    public void testStatistics() throws Exception {
        // Initially stats should be zero
        AuthenticationRateLimiter.RateLimiterStats stats = rateLimiter.getStats();
        assertEquals(0, stats.getTotalBlocked());
        assertEquals(0, stats.getAccountsLocked());

    putEdge(1, 2); // Duplicate
    putEdge(4, 5);
  }

  // Element Mutation

  @Test
  public void putEdge_existingNodes() {
    assume().that(graphIsMutable()).isTrue();

    // Adding nodes initially for safety (insulating from possible future
    // modifications to proxy methods)
    addNode(N1);
    addNode(N2);

    assertThat(graphAsMutableGraph.putEdge(N1, N2)).isTrue();
  }

  @Test