How to access the style attribute of Primeng table

In an angular project, I need to test that the displayed table width of the primeng data table is set to the maxWidth value i assign to it. To do so, i want to call the [style] attribute to get the width and see if its equal to my maxWidth. However, i do not know how to call attributes like this. How do i go about this? Currently i have no clue if I'm going in the correct direction.

I have tried several things but I am not sure of the syntax for it.

<p-table class="p-table" ... [style] = "{width: maxWidth}" >

it('should implement maxwidth', () => {
    const widthDebug: DebugElement = fixture.debugElement;
    const tableWidth = widthDebug.query(By.css('.ui-table .ui-widget'));
    const ptable: HTMLElement = tableWidth.nativeElement;

    expect(ptable.textContent).toContain("width: " + component.maxWidth);

});

expected: success (ptable.textContent contains "width: component.maxWidth") actual: TypeError: cannot read property 'nativeElement' of null