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Now that we have managed to load a custom raised button with the pump we did mattered.
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We can start doing something interesting with it.
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And for example we could check that this widget has a raised button inside it and to do that we need
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to use an object which is called a finder.
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So over here we can type the final button equals find.
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And here we get a list of all the metals that we can use to find a widget.
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And the one that we want is find by type like this.
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And so here we can pass braised bottom as an argument and then we need to write an expectation.
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So here I can type expect that button and then I'm going to use something that is called a matter.
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And in this case I can type finds one widget like this and finds one way that is a specific matter that
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is defined in the flatter test package.
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So in a nutshell this code tries to find a widget of type raised button inside the widget 3 that is
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returned by the custom raised but the widget.
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And then we expect that we find exactly one match by using this matter constant.
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So let's run the tests again OK.
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So let's get some more practice using matters by writing another expectation.
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And here I could dive extract and then find that y type.
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And this time I is flat bottom and then I want my matter to be fines nothing like this and finds nothing
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is a very common matter that is used to check that no we just are fun.
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So I could run the tests again and what we are saying here is that we expect to find our raised button
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but not a flat bottom.
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And our tests have passed again.
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OK.
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So let's take things one step further.
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And as you can see this custom raised button takes an optional child.
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We did and this is normally used to add some text inside a button.
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So as our next step we cannot a child.
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We did when we create this button and here we can pass up the text.
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We did that says stop me for example.
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And if we want here we can right expect and then find and this time we can say text and we're going
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to use the same string.
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So to me like this and we are going to use finds one widget as a matter.
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So let's run this test again.
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And the idea here is that we can pass a custom child to our widget and because this is a text widget
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then we can find that we did with the text that was used to configure it.
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And once again our test is green.
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In summary we have discovered how we can check if a widget contains another widget either white type
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or with a specific text.
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And to do that we need to use finders and matters.
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So let's continue on the next video.
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