Infosys Certified Flutter Developer

Which of the following statements are true regarding debugging app by using breakpoints?

1. Step in step into a method call, stopping at the first executable line in that method
2. When the app encounters a breakpoint, it terminates the execution
3. When performing a hot restart for a Flutter app, user breakpoints are cleared

Consider the code given below:

class MyGreeting {
 String value = "";
 void morningGreeting() => greeting="Good morning"
}

test('Greeting should be Good morning, () {
 /* Your Code goes here */
});

Which of the following code snippets should be placed inside test(), for checking whether on calling morningGreeting(), greeting is set to "Good morning"?

Which error do we encounter while trying to place one scrollable widget inside another scrollable widget?

Which of the below is/are false?

1. DevTools Timeline view is used to perform a performance trace
2. Widget inspector allows setting breakpoints in the application
3. Flutter inspector's Slow Animation button can be used to debug animations.

Which of the following issues can lead to this error?

1. The vertical viewport is having an unbounded height
2. An InputDecorator is having unbounded width
3. RenderFlex overflow error

Flutter can use ________ and _______ to display events from the Dart runtime, for application-level logging of events and to execute app step by step in order to find out the bug.

Which of the following lines of code should be placed in Line 3 to :

• Find the textField and addButton by the keys “addField” and “addButton” resectively
• Initialize the flutter driver

void main() {
 group( 'Todo App' , (){
   late FlutterDriver driver;
     /* Line 3 */
     test('add a Todo',() async {
     await driver.tap(textField);
     await driver.enterText('Do homework' );
     await driver.tap(addButton);
     expect(await driver.getText(find.text('Do homework')), 'Do homework')
   });
 });
}

Which of the following limitations can be overcome by mocking the unit tests?

A) Calling APIs or databases slows down test execution.
B) If an API or database returns an unexpected result, then our passing test might start failing
C) It is difficult to test all possible success and failure scenarios by using a real API or database.

Alex is getting RenderFlex overflow error while he was developing a flutter page to display a list of products. Which widget/s can he use to resolve the error?

Which of the below code should be placed inside test() for testing whether on calling reset(), speed is set to 0?

class Race{
 int speed=20;
 void reset() => speed=0;
}
test( 'Speed should reset to 0', () {
   /* Your code goes here */
});