The method 'MultiHeaders.set' has fewer named arguments than those of overridden method 'HttpHeaders.set'. 1

The method ‘MultiHeaders.set’ has fewer named arguments than those of overridden method ‘HttpHeaders.set’.

flutter pub upgrade

Here is what the above code is Doing:
1. We’re importing the flutter_test package, which provides the test
function and the WidgetTester class for testing.
2. We’re importing the main function, which tells the Flutter driver
to run our app.
3. We’re importing the MyApp widget, which is the root of our app.
4. We’re creating a test. The test function takes a description string
and a callback. The callback is a function that contains the code for
the test.
5. We’re using the WidgetTester to build a new instance of the MyApp
widget, and then we use the finder to locate the Text widget in the
widget tree.
6. We’re using the expect function to make sure that the text we
located contains the string ‘Hello, World!’.
7. We’re calling the main function, which tells the Flutter driver to
run our tests.

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