OkHttp3TestUtils.java

public static void initMockSslContext() throws KeyStoreException, NoSuchAlgorithmException {
  final TrustManagerFactory trustManagerFactory = PowerMockito.mock(TrustManagerFactory.class);
  final TrustManager[] trustManagers = new TrustManager[1];

  // Mock TrustManagerFactory.getInstance(String)
  mockStatic(TrustManagerFactory.class);
  when(TrustManagerFactory.getInstance(anyString())).thenReturn(trustManagerFactory);

  // Mock TrustManagerFactory#getTrustManagers()
  trustManagers[0] = PowerMockito.mock(X509TrustManager.class);
  doNothing().when(trustManagerFactory).init(any(KeyStore.class));
  when(trustManagerFactory.getTrustManagers()).thenReturn(trustManagers);

  // Mock SSLContext.getInstance(String)
  mockStatic(SSLContext.class);
  when(SSLContext.getInstance(anyString())).thenReturn(PowerMockito.mock(SSLContext.class));

  // Mock CertificateChainCleaner.get(X509TrustManager)
  mockStatic(CertificateChainCleaner.class);
  when(CertificateChainCleaner.get(any(X509TrustManager.class)))
      .thenReturn(PowerMockito.mock(CertificateChainCleaner.class));
}