Cover exception cases in CapabilitiesClientTest

package it.niedermann.owncloud.notes.persistence;

import android.accounts.NetworkErrorException;

import android.os.Build;

import androidx.arch.core.executor.testing.InstantTaskExecutorRule;

import it.niedermann.owncloud.notes.shared.model.Capabilities;

import it.niedermann.owncloud.notes.shared.model.OcsResponse;

import it.niedermann.owncloud.notes.shared.model.OcsUser;

import okhttp3.Request;

import retrofit2.Call;

import retrofit2.Callback;

import retrofit2.Response;

import static org.junit.Assert.assertEquals;

import static org.junit.Assert.assertNull;

import static org.junit.Assert.assertThrows;

import static org.mockito.ArgumentMatchers.any;

import static org.mockito.Mockito.mock;

import static org.mockito.Mockito.when;

        assertEquals("[1.0]", capabilities.getApiVersion());

        assertEquals("ETag should be read correctly from response but wasn't.", "1234", capabilities.getETag());

        when(ocsAPI.getCapabilities(any())).thenReturn(Observable.error(new RuntimeException()));

        assertThrows(RuntimeException.class, () -> CapabilitiesClient.getCapabilities(ApplicationProvider.getApplicationContext(), ssoAccount, null, apiProvider));

        when(ocsAPI.getCapabilities(any())).thenReturn(Observable.error(new RuntimeException(new NetworkErrorException())));

        assertThrows("Should unwrap exception cause if possible", NetworkErrorException.class, () -> CapabilitiesClient.getCapabilities(ApplicationProvider.getApplicationContext(), ssoAccount, null, apiProvider));

    }

    @SuppressWarnings("unchecked")

        mockOcs.ocs = new OcsResponse.OcsWrapper<>();

        mockOcs.ocs.data = new OcsUser();

        mockOcs.ocs.data.displayName = "Peter";

        final Response<OcsResponse<OcsUser>> ocsUserResponseMock = Response.success(mockOcs);

        final Response<OcsResponse<OcsUser>> responseMock = Response.success(mockOcs);

        final Call<OcsResponse<OcsUser>> callMock = mock(Call.class);

        when(callMock.execute()).thenReturn(ocsUserResponseMock);

        when(ocsAPI.getUser(any())).thenReturn(callMock);

        final String user = CapabilitiesClient.getDisplayName(ApplicationProvider.getApplicationContext(), ssoAccount, apiProvider);

        assertEquals("Peter", user);

        when(callMock.execute()).thenReturn(responseMock);

        assertEquals("Peter", CapabilitiesClient.getDisplayName(ApplicationProvider.getApplicationContext(), ssoAccount, apiProvider));

        when(callMock.execute()).thenThrow(new RuntimeException() {

            @Override

            public void printStackTrace() {

                // Do not spam console, this will be printed.

            }

        });

        assertNull(CapabilitiesClient.getDisplayName(ApplicationProvider.getApplicationContext(), ssoAccount, apiProvider));

    }

}

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