openbakery / swifthamcrestautolayoutmatchers

Hamcrest AutoLayout Matchers

This frameworks contains Hamcrest matchers to verify auto layout constraints.

Example:

func test_height_matcher() {
	// given
	first.heightAnchor.constraint(equalToConstant: 44.0).isActive = true
		
	// expect
	assertThat(first, hasHeight(of: 44))
}

Center and Size

assertThat(view, isVerticalCenter())
assertThat(view, isHorizontalCenter())
// or
assertThat(view, isCenter())

assertThat(view, hasWidth(of:150))
assertThat(view, hasHeight(of:44))

Pinned

assertThat(view, isPinned(.top, gap: 20))
assertThat(view, isPinned(.left, gap: 20))
assertThat(view, isPinned(.right, gap: 20))
assertThat(view, isPinned(.bottom, gap: 20))
// or
assertThat(view, isPinned(.leading, gap: 20))
assertThat(view, isPinned(.trailing, gap: 20))

// isPinned(<NSLayoutConstraint.Attribute>)

Pinned to other

assertThat(first, isPinned(.top, gap: 20))
assertThat(first, isVerticalCenter())
//assertThat(first, hasWidth(of:150))
//assertThat(first, hasHeight(of:44))

assertThat(second, hasSameWidthAs(first))
assertThat(second, hasSameHeightAs(first))
assertThat(second, isVerticalCenter())
assertThat(second, isPinned(.top, toView: first, gap: 20))

Save Area

// Safe area
assertThat(view, isPinnedToSafeAreaAnchor(.top))

// Readable Anchor
assertThat(view, isPinnedToReadableAnchor(.leading))