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GitHub Copilot GH-300 Practice Test 21

Question 200

A developer wants citations to current documentation for a generated SDK integration. Which action most directly addresses this constraint?

  1. Provide source/target schemas, target version and rollout constraints
  2. Ask for a ranked diagnostic plan with experiments rather than an unverified fix
  3. Request links to official docs and independently verify each claim
  4. Add an explicit input partition matrix to the prompt

Explanation

Correct Answer

C:

This intervention is proportionate to the problem. A language model can fabricate citations unless checked. Its acceptance evidence is that each referenced API appears in the official current reference.

Incorrect Answers

A:

This measure fits a different failure: a developer asks for a migration but supplies no schema or DB version. In that situation prompt structure should include task, context and acceptance criteria. It does not establish the requested outcome: each referenced API appears in the official current reference.

B:

This measure fits a different failure: a failing integration test has several possible causes and no reproduction instructions. In that situation a testable diagnosis separates hypothesis from evidence. It does not establish the requested outcome: each referenced API appears in the official current reference.

D:

This measure fits a different failure: an AI-generated validator handles normal cases but fails whitespace and Unicode edge cases. In that situation a test matrix ensures boundary conditions are requested. It does not establish the requested outcome: each referenced API appears in the official current reference.

Question 201

A parser crashes on malformed binary payloads despite many happy-path tests. What should the team implement or verify first?

  1. Ask for invariant-based property tests rather than handpicked expected strings only
  2. Use Copilot to propose type annotations and independently run static checks
  3. Ask Copilot for a minimal shared helper while preserving behavior and run regression tests
  4. Use controlled fuzzing and sanitizers with memory safety checks

Explanation

Correct Answer

D:

Use controlled fuzzing and sanitizers with memory safety checks. This directly addresses the stated constraint: Randomized malformed inputs help uncover unanticipated failures. The decision can be tested by checking that the parser rejects malformed payloads without crash or excessive resource use.

Incorrect Answers

A:

Properties can expose cases beyond fixed examples when invariants are correct. That makes this relevant when a string normalization helper has many input combinations and manual examples are sparse, whereas this scenario has a different controlling requirement and acceptance test. Here the controlling problem is a parser crashes on malformed binary payloads despite many happy-path tests, and the proposal must meet that constraint.

B:

Type hints can expose incompatible assumptions but require correct modeling. That makes this relevant when a dynamic Python service has runtime errors from None values, whereas this scenario has a different controlling requirement and acceptance test. Here the controlling problem is a parser crashes on malformed binary payloads despite many happy-path tests, and the proposal must meet that constraint.

C:

Refactoring can reduce duplication but may accidentally change edge handling. That makes this relevant when a service repeats the same date parser in four modules, whereas this scenario has a different controlling requirement and acceptance test.

Question 202

A developer requests simultaneous edits across a React component, API handler and tests. Choose the intervention that resolves the underlying issue.

  1. Use an edit workflow with explicitly scoped working-set files
  2. Remove and rotate exposed credentials and use approved secret input handling
  3. Use an approved agent workflow with iterative edits and test validation
  4. Use Copilot code review as an assistive reviewer rather than code-writing mode

Explanation

Correct Answer

C:

The key is the specific capability, not simply the fact that AI suggested it. Agent mode can coordinate multi-file changes but results need human review. In this case the proposed action is use an approved agent workflow with iterative edits and test validation; confirm it through the concrete expected result.

Incorrect Answers

A:

Although technically useful, this addresses a developer wants one supported edit applied to selected files without open-ended planning. The stated constraint instead needs a change whose evidence is: All three files form one coherent tested change without extra side effects.

B:

Although technically useful, this addresses a developer includes a production API key directly in a prompt argument captured by shell history. The stated constraint instead needs a change whose evidence is: All three files form one coherent tested change without extra side effects.

D:

Although technically useful, this addresses a contributor wants feedback on a submitted pull request, not more autonomous edits. The stated constraint instead needs a change whose evidence is: All three files form one coherent tested change without extra side effects.

Question 203

Follow-up with diff together with Prompt refinement now needs a coordinated review. The first finding is: Copilot says it fixed a race but a PR shows unrelated threading changes. The second finding is: A model suggests an API design without discussing authentication. Select TWO actions, one that resolves each finding.

  1. Ask for a line-by-line explanation of the changed synchronization
  2. Ask for a bounded explanation and counterexample before code changes
  3. Specify minimal diff, preserved interfaces and tests as completion criteria
  4. Treat project comments as data and follow authorized task constraints
  5. Revise the prompt to explicitly require auth, error and audit behavior

Explanation

Correct Answers

A:

This addresses the first finding. Diff-grounded prompts force attention to actual modifications. The verification is: Every changed lock corresponds to a documented race condition. The complementary action addresses Prompt refinement.

E:

This addresses the second finding. Clarifying constraints can improve generated design completeness. The verification is: The new design includes verified authorization outcomes. The complementary action addresses Follow-up with diff.

Incorrect Answers

B:

This is relevant to a different case: A junior developer does not understand the effect of async cancellation on an existing worker. Its capability is: Conceptual explanation can reduce unsafe premature edits. Neither Follow-up with diff nor Prompt refinement requires that result.

C:

This is relevant to a different case: An agent makes unwanted stylistic changes while addressing a logic bug. Its capability is: Constraints limit unnecessary scope expansion. Neither Follow-up with diff nor Prompt refinement requires that result.

D:

This is relevant to a different case: Repository comments ask an agent to disable tests but a human task requires preserving them. Its capability is: Untrusted repository content cannot authorize harmful workflow changes. Neither Follow-up with diff nor Prompt refinement requires that result.

Question 204

A pull request has AI-generated code but lacks reviewer identity. What is the defensible engineering decision?

  1. Differentiate generated preview from accepted code changes
  2. Require code review and security testing after any model-side filter
  3. Maintain normal human accountability and branch protections
  4. Include the pending diff and test error as context

Explanation

Correct Answer

C:

Maintain normal human accountability and branch protections. This directly addresses the stated constraint: Generated contributions remain code changes requiring human decisions. The decision can be tested by checking that the merge record shows authorized approvals and quality checks.

Incorrect Answers

A:

This measure fits a different failure: a developer believes ghost text modifies the repository before the user accepts it. In that situation inline suggestions must be accepted to become tracked edits. It does not establish the requested outcome: the merge record shows authorized approvals and quality checks.

B:

This measure fits a different failure: a team claims content safety filtering makes generated code production secure. In that situation output filters cannot replace domain-specific secure design validation. It does not establish the requested outcome: the merge record shows authorized approvals and quality checks.

D:

This measure fits a different failure: a reviewer asks why a new guard clause fails but Copilot discusses only committed code. In that situation generated suggestions depend on the code and edits actually supplied. It does not establish the requested outcome: the merge record shows authorized approvals and quality checks.

Question 205

A security-focused subagent asks for secrets to test a password reset flow. Which step should the responsible reviewer require?

  1. Review relevant organization policy and audit records
  2. Treat tool results as untrusted data and deny unauthorized access
  3. Provide synthetic credentials and keep secrets outside tool access
  4. Keep GitHub repository authorization separate from Copilot plan entitlement

Explanation

Correct Answer

C:

The key is the specific capability, not simply the fact that AI suggested it. Delegating a task does not justify exposing production credentials. In this case the proposed action is provide synthetic credentials and keep secrets outside tool access; confirm it through the concrete expected result.

Incorrect Answers

A:

Central policy decisions should be traceable through administrative evidence. That makes this relevant when a security team needs to understand who enabled terminal Copilot access for an organization, whereas this scenario has a different controlling requirement and acceptance test.

B:

Tool output can carry prompt injection attempts. That makes this relevant when a third-party MCP tool returns text instructing Copilot to dump local SSH keys, whereas this scenario has a different controlling requirement and acceptance test.

D:

Copilot subscription rights do not grant repository permissions. That makes this relevant when a team wants users with Chat entitlement to read private repos they cannot normally access, whereas this scenario has a different controlling requirement and acceptance test.

Question 206

Plan external export or authorized retention where supported. The prior failure was: A security auditor needs policy history older than the available audit-log retention window. Which observation should appear in the test record?

  1. An eligible PR gets an AI review event without changing required approvals
  2. The reconciliation lists additions and removals without leaking tokens
  3. No raw key remains in command history or generated output
  4. The historical event can be retrieved from the approved archive

Explanation

Correct Answer

D:

This is the acceptance signal tied to the issue: The historical event can be retrieved from the approved archive. It is causally related because audit data availability depends on retention and plan settings.

Incorrect Answers

A:

This observation would make sense for the independent case "Copilot code review policy", whose acceptance criterion is An eligible PR gets an AI review event without changing required approvals. It is not proof of the current remediation. In this verification case, the decisive result is the historical event can be retrieved from the approved archive, not a generic indication that the tool was used.

B:

This observation would make sense for the independent case "REST subscription audit", whose acceptance criterion is The reconciliation lists additions and removals without leaking tokens. It is not proof of the current remediation.

C:

This observation would make sense for the independent case "CLI secret argument", whose acceptance criterion is No raw key remains in command history or generated output. It is not proof of the current remediation. In this verification case, the decisive result is the historical event can be retrieved from the approved archive, not a generic indication that the tool was used.

Question 207

An employee claims an assistant never received a secret after it was displayed in an editor. Select the remediation supported by this evidence.

  1. Inspect the actual diff and changed control flow rather than trusting the summary
  2. Verify actual data-flow and supported exclusions rather than assuming
  3. Sanitize the trace and minimize incident data before prompt submission
  4. Evaluate changes against a fixed quality rubric and representative regression cases

Explanation

Correct Answer

B:

Verify actual data-flow and supported exclusions rather than assuming. This directly addresses the stated constraint: Editor context may be used to construct prompts depending on surface and policy. The decision can be tested by checking that the privacy review identifies exactly which content the feature can access.

Incorrect Answers

A:

This is a reasonable intervention for the separate case "Review context". Its value is generated summaries can omit security-relevant details, not resolving the current requirement. Here the controlling problem is an employee claims an assistant never received a secret after it was displayed in an editor, and the proposal must meet that constraint.

C:

This is a reasonable intervention for the separate case "Sensitive incident report". Its value is troubleshooting context can carry identifiers unrelated to the code bug, not resolving the current requirement.

D:

This is a reasonable intervention for the separate case "Model drift assumption". Its value is probabilistic outputs and model updates make exact wording unstable, not resolving the current requirement. Here the controlling problem is an employee claims an assistant never received a secret after it was displayed in an editor, and the proposal must meet that constraint.

Question 208

A long Copilot chat starts following assumptions from an abandoned earlier approach. What would a responsible maintainer do next?

  1. Delegate the bounded research to a subagent and inspect its findings
  2. Use Copilot Chat with explicit tradeoff constraints
  3. Start a focused conversation with the current requirement and relevant file selection
  4. Ask Copilot Chat with the relevant stack trace and narrow file context

Explanation

Correct Answer

C:

The key is the specific capability, not simply the fact that AI suggested it. Old context can distract a later prompt from revised acceptance criteria. In this case the proposed action is start a focused conversation with the current requirement and relevant file selection; confirm it through the concrete expected result.

Incorrect Answers

A:

This measure fits a different failure: a long refactor needs isolated research into a particular database library. In that situation subagents can separate specialized context without granting blanket edit authority. It does not establish the requested outcome: the resulting answer references current code and the new constraint only.

B:

This measure fits a different failure: a team asks for rationale and competing design choices rather than a few characters of implementation. In that situation chat can discuss options while inline completion primarily proposes local edits. It does not establish the requested outcome: the resulting answer references current code and the new constraint only.

D:

This measure fits a different failure: a developer needs to understand why one stack trace and its surrounding source produce an exception. In that situation conversational explanation is better suited than accepting an inline code completion blindly. It does not establish the requested outcome: the resulting answer references current code and the new constraint only.

Question 209

Copilot generates Python syntax inside a TypeScript file. Which course of action is best justified?

  1. Verify working directory and explicit file references before retrying
  2. Ask Copilot Chat with the relevant stack trace and narrow file context
  3. Split the task and provide precise linked modules or summaries
  4. Verify the language mode, current file and surrounding imports

Explanation

Correct Answer

D:

This intervention is proportionate to the problem. Editor language and nearby code affect context construction. Its acceptance evidence is that the revised suggestion follows TypeScript syntax and project dependencies.

Incorrect Answers

A:

Local context is scoped by current workspace and tool access. That makes this relevant when the CLI explains tests from the wrong repository after the operator changes directories, whereas this scenario has a different controlling requirement and acceptance test.

B:

Conversational explanation is better suited than accepting an inline code completion blindly. That makes this relevant when a developer needs to understand why one stack trace and its surrounding source produce an exception, whereas this scenario has a different controlling requirement and acceptance test.

C:

Context windows and automatic selection do not guarantee whole-repository coverage. That makes this relevant when copilot answers a repository-wide architectural question from only the open file, whereas this scenario has a different controlling requirement and acceptance test.

Question 210

Copilot proposes a cleanup script that recursively removes a shared project directory. Which action most directly addresses this constraint?

  1. Restrict the target path, dry-run, and obtain review before executing destructive commands
  2. Compare the design against hosting constraints before implementing
  3. Enforce acceptance criteria that preserve tests and require explicit review of deletions
  4. Inspect and verify the script source before running with least privilege

Explanation

Correct Answer

A:

Restrict the target path, dry-run, and obtain review before executing destructive commands. This directly addresses the stated constraint: A natural-language assistant may infer a broader target than intended. The decision can be tested by checking that the dry run lists only allowed disposable files and rejects the root path.

Incorrect Answers

B:

Although technically useful, this addresses copilot proposes serverless for a long-running stateful task with strict socket requirements. The stated constraint instead needs a change whose evidence is: The dry run lists only allowed disposable files and rejects the root path.

C:

Although technically useful, this addresses an agent proposes deleting failing tests instead of repairing the implementation. The stated constraint instead needs a change whose evidence is: The dry run lists only allowed disposable files and rejects the root path.

D:

Although technically useful, this addresses copilot suggests piping an unverified script from the internet directly into a privileged shell. The stated constraint instead needs a change whose evidence is: The dry run lists only allowed disposable files and rejects the root path.

GitHub Copilot (GH-300) Practice Tests

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