fix: Allow SVGElement in toContainElement and toBeInTheDOM (#38)

Author: jgoz

README.md

@@ -100,7 +100,7 @@ expect.extend({toBeInTheDOM, toHaveClass})
 ### `toBeInTheDOM`
 
 ```typescript
-toBeInTheDOM(container?: HTMLElement)
+toBeInTheDOM(container?: HTMLElement | SVGElement)
 ```
 
 This allows you to assert whether an element present in the DOM container or not. If no DOM container is specified it will use the default DOM context.
@@ -161,7 +161,7 @@ expect(queryByTestId(container, 'not-empty')).not.toBeEmpty()
 ### `toContainElement`
 
 ```typescript
-toContainElement(element: HTMLElement)
+toContainElement(element: HTMLElement | SVGElement)
 ```
 
 This allows you to assert whether an element contains another element as a descendant or not.

extend-expect.d.ts

@@ -1,10 +1,10 @@
 declare namespace jest {
   interface Matchers<R> {
-    toBeInTheDOM(container?: HTMLElement): R
+    toBeInTheDOM(container?: HTMLElement | SVGElement): R
     toBeVisible(): R
     toBeEmpty(): R
     toBeDisabled(): R
-    toContainElement(element: HTMLElement): R
+    toContainElement(element: HTMLElement | SVGElement): R
     toHaveAttribute(attr: string, value?: string): R
     toHaveClass(...classNames: string[]): R
     toHaveStyle(css: string): R