MCQs on Testing and Debugging | Ruby
Gain a deeper understanding of testing and debugging in Ruby, focusing on unit testing frameworks like Minitest and RSpec, as well as essential debugging tools such as byebug and pry. These 30 multiple-choice questions will guide you through essential testing concepts and debugging practices.
Introduction to Unit Testing with Minitest or RSpec
- Which of the following is a popular testing framework used in Ruby?
- A) Minitest
- B) RSpec
- C) Both A and B
- D) None of the above
- Which gem is required to use RSpec for testing in Ruby?
- A) rspec-core
- B) minitest
- C) rspec
- D) test-unit
- What is the default assertion method used in Minitest?
- A) assert_equal
- B) assert_true
- C) assert_instance_of
- D) assert_match
- How do you run RSpec tests from the command line?
- A) ruby rspec_tests.rb
- B) rspec
- C) rspec test
- D) test rspec
- What method in RSpec is used to define a test example?
- A) it
- B) test
- C) describe
- D) example
- In Minitest, which method is used to check equality between two values?
- A) assert_equal
- B) assert_match
- C) assert_same
- D) assert_raises
- Which RSpec method is used to group tests together?
- A) describe
- B) group
- C) it
- D) test
- What is the purpose of
beforeandafterhooks in RSpec?- A) To execute code before and after each test
- B) To define the test cases
- C) To ignore failed tests
- D) To skip the current test
- How do you define a test case in RSpec?
- A) test “should work” do
- B) it “should work” do
- C) define test_case “should work”
- D) test_case do
- In Minitest, which method is used to check if an error is raised?
- A) assert_raises
- B) assert_error
- C) assert_thrown
- D) assert_fail
- Which of the following is true about RSpec and Minitest?
- A) Both are used for unit testing
- B) RSpec is more declarative, while Minitest is more imperative
- C) Minitest is faster than RSpec
- D) All of the above
- Which method in RSpec is used to expect a value to raise an exception?
- A) expect { }.to raise_error
- B) should_raise
- C) expect_to_raise
- D) expect_error
- Which testing framework is included by default in Ruby?
- A) RSpec
- B) Minitest
- C) Test::Unit
- D) Cucumber
- What is the
contextkeyword used for in RSpec?- A) To group related examples based on a common condition
- B) To define a test case
- C) To describe the object being tested
- D) To list all the assertions
- How do you specify an expectation in RSpec?
- A) expect(value).to eq(expected_value)
- B) assert(value).eq(expected_value)
- C) assert_equal(value, expected_value)
- D) should_equal(value, expected_value)
- What is the purpose of mocking and stubbing in testing?
- A) To simulate the behavior of objects or methods in tests
- B) To check if the code is working
- C) To measure the code’s performance
- D) To skip tests that are not relevant
- How do you run a single test case in RSpec?
- A) rspec test_spec.rb
- B) rspec -t test_case
- C) ruby test_spec.rb
- D) rspec –run test_case
- Which command will generate an RSpec test file?
- A) rspec generate
- B) rspec –init
- C) rspec new
- D) rspec –new-file
- What is the
letkeyword used for in RSpec?- A) To define variables for test examples
- B) To define a helper method
- C) To group related tests
- D) To define a class method
- Which of the following is a valid RSpec matcher for testing whether a string includes a substring?
- A) include
- B) match
- C) contain
- D) has
Debugging Tools (byebug, pry)
- Which gem is used for debugging Ruby code with breakpoints?
- A) pry
- B) byebug
- C) debugger
- D) both A and B
- How do you add a breakpoint in Ruby using
byebug?- A) byebug
- B) breakpoint
- C) debug
- D) stop_debug
- Which command is used in
pryto step through the code line by line?- A) step
- B) next
- C) continue
- D) trace
- What is the purpose of
binding.pryin Ruby?- A) It pauses the execution of code and opens an interactive session
- B) It prints the value of a variable
- C) It skips the current line of code
- D) It checks for syntax errors
- How do you exit a
prysession?- A) exit
- B) quit
- C) Ctrl + D
- D) exit_session
- Which method in
byebugallows you to step through code after a breakpoint?- A) step
- B) next
- C) continue
- D) next_line
- In
byebug, what command is used to continue execution after hitting a breakpoint?- A) step
- B) next
- C) continue
- D) run
- Which of the following can be used to inspect variables in
pry?- A) pry variable_name
- B) show variable_name
- C) display variable_name
- D) var variable_name
- Which command in
byebugshows the current stack trace?- A) stack
- B) where
- C) trace
- D) call
- Which of the following is NOT a feature of the
prygem?- A) Interactive REPL
- B) Syntax highlighting
- C) Code coverage reports
- D) Debugging
Answer Key
| Qno | Answer (Option with the text) |
|---|---|
| 1 | C) Both A and B |
| 2 | C) rspec |
| 3 | A) assert_equal |
| 4 | B) rspec |
| 5 | A) it |
| 6 | A) assert_equal |
| 7 | A) describe |
| 8 | A) To execute code before and after each test |
| 9 | B) it “should work” do |
| 10 | A) assert_raises |
| 11 | D) All of the above |
| 12 | A) expect { }.to raise_error |
| 13 | B) Minitest |
| 14 | A) To group related examples based on a common condition |
| 15 | A) expect(value).to eq(expected_value) |
| 16 | A) To simulate the behavior of objects or methods in tests |
| 17 | A) rspec test_spec.rb |
| 18 | B) rspec –init |
| 19 | A) To define variables for test examples |
| 20 | A) include |
| 21 | D) both A and B |
| 22 | A) byebug |
| 23 | B) next |
| 24 | A) It pauses the execution of code and opens an interactive session |
| 25 | C) Ctrl + D |
| 26 | B) next |
| 27 | C) continue |
| 28 | A) pry variable_name |
| 29 | B) where |
| 30 | C) Code coverage reports |