Magento2 unit test error "Error: Call to a member function getDirectoryWrite() on null"

Pallavi
April 17, 2023
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Magento2 unit test for block file for admin grid extending MagentoBackendBlockWidgetGridExtended is giving error "Error: Call to a member function getDirectoryWrite() on null"

added below mocks, still error continues.

$this->_filesystem = $this->createMock(Filesystem::class);
$this->_directory = $this->createMock(DirectoryWrite::class);
$this->_filesystem->method('getDirectoryWrite')->willReturn($this->_directory);

Can anyone help here?