Unit 3: Continuous Integration (CI) & Build Automation - Practice Quiz

1 What does the abbreviation CI stand for in DevOps?

2 Which of the following is a key benefit of Continuous Integration?

3 In CI, how often are developers encouraged to integrate their code into the main branch?

4 What typically triggers a CI pipeline to start running?

5 Which of the following is a common stage found in a CI pipeline?

6 In a CI pipeline, what is an artifact?

7 Which of the following CI tools is an open-source automation server written primarily in Java?

8 Which CI/CD tool is built directly into the GitHub platform?

9 What file format is commonly used to define GitHub Actions workflows?

10 Which configuration file is used to define pipelines in GitLab CI?

11 Which build tool uses a file named pom.xml for its configuration?

12 Which build tool is most commonly associated with JavaScript/Node.js projects?

13 Which build tool uses a Groovy or Kotlin based DSL in files like build.gradle?

14 Which file stores project dependencies for an npm project?

15 What is the name of the file used to define a Jenkins pipeline as code?

16 In a Jenkins declarative pipeline, which block contains all the stages?

17 In a Jenkins declarative pipeline, what does the agent directive specify?

18 What is the main goal of an automated build?

19 Why is automated testing important in a CI pipeline?

20 What does code coverage measure?

21 A team merges code into the shared main branch only once every two weeks, resulting in painful merge conflicts. Which core Continuous Integration principle would most directly address this problem?

22 Which outcome is the least likely direct benefit of adopting Continuous Integration?

23 In a typical CI pipeline, what event most commonly acts as the trigger that starts a pipeline run?

24 A pipeline is arranged so that if the compile/build stage fails, no later stages run. What is the primary reason for this fail-fast ordering?

25 Which statement correctly distinguishes GitHub Actions from a self-hosted Jenkins server in a default setup?

26 In GitLab CI, which file located at the repository root defines the pipeline configuration?

27 A team wants to run each job of their CI pipeline inside a fresh, isolated container image they specify. Which CI tool is especially known for making per-job Docker containers a first-class, native concept via a docker executor?

28 A Java project uses Maven. Which command compiles the code, runs tests, and packages the result into a JAR/WAR without installing it to the local repository?

29 What is the primary functional advantage of Gradle's incremental build support compared to a naive full rebuild every time?

30 In a Node.js project, which file records the exact resolved version of every installed dependency to ensure reproducible installs across machines?

31 Which pair correctly matches a build tool with the ecosystem it is most commonly used in?

32 In a Jenkins Declarative Pipeline, which block is required at the top level to specify where the pipeline will execute?

33 Consider this Jenkins snippet:
groovy
post {
always {
echo 'Cleaning up'
}
}

When does the always block execute?

34 In a Declarative Pipeline, where must individual stage blocks be placed?

35 A pipeline author wants a variable available as an environment variable to every step in all stages of the build. Which directive should be used at the top level of the Declarative Pipeline?

36 Which practice best characterizes an automated build in a CI context?

37 Why is producing a versioned, immutable build artifact (e.g., a specific JAR) important in a CI/CD workflow?

38 A CI pipeline runs unit tests automatically on every push. A commit introduces code that breaks a test. What is the most valuable immediate benefit of this automation?

39 Which ordering of test types generally reflects a healthy test pyramid, from most to fewest tests?

40 A test suite reports 85% line coverage. What does this figure specifically indicate?

41 A team practices trunk-based development with CI, but developers still experience frequent 'integration hell' at release time. Investigation shows that although commits are pushed to the main branch several times daily, the CI pipeline only runs a compile step and no tests, and feature flags are absent. Which corrective action most directly restores the core CI benefit being violated?

42 In a fan-out/fan-in CI pipeline, a build stage produces an artifact consumed by three parallel test stages (unit, integration, contract), which then converge into a single deploy stage. If the integration test stage has a flaky 20% failure rate per run and the pipeline retries only that stage up to 2 additional times, what is the approximate probability the pipeline reaches the deploy stage on a given trigger (assuming other stages always pass)?

43 Consider this Jenkins declarative snippet:

groovy
pipeline {
agent none
stages {
stage('Build') {
agent { label 'linux' }
steps { sh 'make' }
}
stage('Test') {
agent { label 'linux' }
steps { sh './run-tests --input target/app.bin' }
}
}
}


The Test stage fails because target/app.bin does not exist. What is the root cause?

44 A Gradle build is slow on CI despite the code changing minimally between runs. The CI runner is ephemeral (fresh container per build). Which combination most effectively reduces build time while remaining correct?

45 A module has 100% line coverage but a production bug slips through: a function divide(a, b) throws on b == 0, which callers never handle. Why did high coverage fail to catch this, and what metric would have exposed the gap?

46 In GitHub Actions, a workflow defines two jobs: build and deploy, where deploy has needs: build. Both jobs set concurrency: production. A developer pushes two commits in quick succession. What behavior results?

47 A reproducible build requirement states that building the same commit twice must yield byte-identical artifacts. A Java build currently fails this check. Which factor is the most likely culprit?

48 A pipeline uses caching to speed up dependency installation. After a security advisory, a compromised dependency version was published and later yanked. The team pins versions but still gets the compromised artifact on some CI runs. What architectural flaw explains this?

49 In a Jenkins declarative pipeline, you need a stage to run only when the branch is main AND a prior stage set an environment variable DEPLOYABLE=true. Which when construct is correct?

50 A CI suite runs 5000 tests in 40 minutes. The team wants sub-10-minute feedback. They shard tests across 4 parallel runners by simple alphabetical file split, but one runner consistently takes 30 minutes. What is the best fix?

51 During npm ci on CI, the build fails with an error that package-lock.json is out of sync with package.json. A developer suggests switching to npm install to 'auto-fix' it. Why is this the wrong fix for CI?

52 In GitLab CI, a job in the test stage must run only for merge requests targeting main, but never on scheduled pipelines. Which rules configuration achieves this correctly?

53 A team enforces a coverage gate of 80%. A developer adds a large auto-generated file with no tests, dropping coverage below the gate. To pass, they add coverage exclusions for generated code. Later, a genuine untested handler also gets excluded by an overly broad glob. What is the key lesson about coverage gates?

54 A manager claims 'we have CI because we run a nightly build and test job'. A CI expert disagrees. Which argument best explains why a nightly-only build is not true Continuous Integration?

55 A Maven multi-module project builds fine locally but fails on CI with 'Could not resolve dependencies for project A: artifact B not found'. Module A depends on module B, both in the same reactor. Locally, B was previously mvn installed. What is the correct CI-safe build command?

56 In CircleCI, a workflow uses a context to inject shared secrets and restricts it to a security group. A contractor's job in the same workflow needs a different, non-privileged credential set. What is the correct approach to enforce least privilege?

57 A declarative pipeline must guarantee that a cleanup step runs whether the build succeeds, fails, or is aborted, and a notification runs only on failure. Which structure is correct?

58 A CI pipeline reports intermittent test failures that disappear on re-run. Analysis shows two tests share a database table and run in parallel. Which statement best characterizes the problem and the most robust fix?

59 A pipeline separates a fast 'commit stage' (compile + unit tests, target < 5 min) from a slower 'acceptance stage'. A proposal suggests moving slow end-to-end tests into the commit stage 'to catch more bugs earlier'. Why does this typically harm the pipeline?

60 Comparing Maven and Gradle for a large monorepo, a team values incremental builds and task-level caching but also wants a low-magic, declarative configuration. Which trade-off statement is most accurate?