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GitHub Copilot GH-300 Practice Test 1

Question 1

An AI answer cites a deleted API endpoint and a two-year-old example. What should the team implement or verify first?

  1. Add resource-level authorization and negative cross-user tests
  2. Compare with current product docs and run a focused integration test
  3. Apply production-safe network and debug defaults before deployment
  4. Hold merge until affected integration behavior is verified

Explanation

Correct Answer

B:

The key is the specific capability, not simply the fact that AI suggested it. Generated documentation references can be stale or fabricated. In this case the proposed action is compare with current product docs and run a focused integration test; confirm it through the concrete expected result.

Incorrect Answers

A:

Authentication proves identity but not entitlement to another user's records. That makes this relevant when an AI-generated endpoint checks login but never checks whether the user owns the requested record, whereas this scenario has a different controlling requirement and acceptance test.

C:

Example convenience settings may expose administrative functionality. That makes this relevant when an AI-generated API example listens on all interfaces with debug mode enabled, whereas this scenario has a different controlling requirement and acceptance test.

D:

Passing unit tests alone is insufficient for external dependency changes. That makes this relevant when a proposed fix passes unit tests but fails the integration suite connecting to the database, whereas this scenario has a different controlling requirement and acceptance test.

Question 2

Set the matching-code policy to Block in the correct organization settings. The prior failure was: An organization prohibits matching public-code suggestions in supported products. Which result is the most persuasive acceptance evidence?

  1. The retained code has approved provenance or is replaced
  2. A known matching pattern is blocked where the feature supports it
  3. The governance record names the limitation and review cadence
  4. The intended repository's supported client applies the rule

Explanation

Correct Answer

B:

This is the acceptance signal tied to the issue: A known matching pattern is blocked where the feature supports it. It is causally related because the filter can suppress detected matching suggestions but is not a complete legal guarantee.

Incorrect Answers

A:

This observation would make sense for the independent case "Legal provenance", whose acceptance criterion is The retained code has approved provenance or is replaced. It is not proof of the current remediation.

C:

This observation would make sense for the independent case "Preview limitation", whose acceptance criterion is The governance record names the limitation and review cadence. It is not proof of the current remediation.

D:

This observation would make sense for the independent case "Wrong branch exclusion", whose acceptance criterion is The intended repository's supported client applies the rule. It is not proof of the current remediation.

Question 3

An engineer wants to apply the same naming correction across several files without delegating arbitrary commands. Which proposed response is appropriate without increasing unrelated risk?

  1. Use a planning interaction to inspect dependencies before authorizing edits
  2. Use an appropriately scoped editing workflow and inspect each changed file
  3. Use Copilot inline suggestions at the cursor and review before accepting
  4. Choose explanatory Copilot Chat rather than agent edit execution

Explanation

Correct Answer

B:

Use an appropriately scoped editing workflow and inspect each changed file. This directly addresses the stated constraint: Targeted edit tools can be safer than broad autonomous terminal access. The decision can be tested by checking that only the declared symbols change and compile checks pass.

Incorrect Answers

A:

This is a reasonable intervention for the separate case "Plan before edit". Its value is plan mode supports scoped design before any repository mutation, not resolving the current requirement.

C:

This is a reasonable intervention for the separate case "Inline next line". Its value is inline completion predicts a localized code edit from editor context, not resolving the current requirement.

D:

This is a reasonable intervention for the separate case "Agent versus chat". Its value is read-only diagnosis is safer when modification was not requested, not resolving the current requirement.

Question 4

Copilot Edits scope together with Repository instructions now needs a coordinated review. The first finding is: A developer wants one supported edit applied to selected files without open-ended planning. The second finding is: A code assistant keeps choosing tabs although the repository mandates four-space indentation. Select TWO actions, one that resolves each finding.

  1. Use an approved agent workflow with iterative edits and test validation
  2. Use the documented device-code OAuth flow or other approved supported method
  3. Install GitHub Copilot CLI through a supported package manager or official script
  4. Add concise repository-wide instructions at .github/copilot-instructions.md
  5. Use an edit workflow with explicitly scoped working-set files

Explanation

Correct Answers

D:

This addresses the second finding. Repository custom instructions provide persistent context where the feature supports them. The verification is: New code follows repo style and formatters still pass. The complementary action addresses Copilot Edits scope.

E:

This addresses the first finding. The surface and requested scope affect what edits Copilot is expected to make. The verification is: Only selected files receive the intended refactor. The complementary action addresses Repository instructions.

Incorrect Answers

A:

This is relevant to a different case: A developer requests simultaneous edits across a React component, API handler and tests. Its capability is: Agent mode can coordinate multi-file changes but results need human review. Neither Copilot Edits scope nor Repository instructions requires that result.

B:

This is relevant to a different case: A headless developer environment cannot open a local browser for Copilot authentication. Its capability is: Remote/headless sessions have authentication paths distinct from desktop browsers. Neither Copilot Edits scope nor Repository instructions requires that result.

C:

This is relevant to a different case: A Linux developer wants terminal Copilot but has only an IDE extension. Its capability is: CLI is a distinct tool needing supported installation and authentication. Neither Copilot Edits scope nor Repository instructions requires that result.

Question 5

Supply current API docs and version lock in the prompt. The prior failure was: An SDK recently renamed an API method and the model uses old syntax. What would make this decision ready for approval?

  1. The new design includes verified authorization outcomes
  2. The new proposal uses the supported library and API
  3. The final method exists in the locked package version
  4. Each referenced API appears in the official current reference

Explanation

Correct Answer

C:

This is the acceptance signal tied to the issue: The final method exists in the locked package version. It is causally related because verified version-specific documentation overrides generic recollection.

Incorrect Answers

A:

Clarifying constraints can improve generated design completeness. That result is therefore evidence for a different capability, while this review requires the final method exists in the locked package version.

B:

Conversation history can reinforce stale assumptions. That result is therefore evidence for a different capability, while this review requires the final method exists in the locked package version.

D:

A language model can fabricate citations unless checked. That result is therefore evidence for a different capability, while this review requires the final method exists in the locked package version.

Question 6

Restrict server permissions or remove the integration after risk review. The prior failure was: An MCP server with document-read access bypasses a carefully set IDE exclusion. Which observation should appear in the test record?

  1. The licensing review documents checks beyond missing match warnings
  2. A permission test confirms sensitive documents cannot be retrieved
  3. An unauthorized account cannot inspect the repository
  4. An independent security test demonstrates tool-level access restrictions

Explanation

Correct Answer

B:

This observation is the required outcome: A permission test confirms sensitive documents cannot be retrieved. It tests the original requirement because mCP tool availability can expose data not controlled by editor exclusion.

Incorrect Answers

A:

This observation would make sense for the independent case "Index limits", whose acceptance criterion is The licensing review documents checks beyond missing match warnings. It is not proof of the current remediation.

C:

This observation would make sense for the independent case "Repository visibility", whose acceptance criterion is An unauthorized account cannot inspect the repository. It is not proof of the current remediation.

D:

This observation would make sense for the independent case "Guardrail overconfidence", whose acceptance criterion is An independent security test demonstrates tool-level access restrictions. It is not proof of the current remediation.

Question 7

An assistant becomes lost in verbose incident logs and ignores the critical stack frame. Select the remediation supported by this evidence.

  1. Move security and acceptance criteria into an explicit prioritized section
  2. Summarize logs and include a minimal representative trace
  3. Provide the failing function, relevant types and a stack trace
  4. Provide representative input-output examples alongside the rules

Explanation

Correct Answer

B:

The key is the specific capability, not simply the fact that AI suggested it. Focused prompts improve signal within context limits. In this case the proposed action is summarize logs and include a minimal representative trace; confirm it through the concrete expected result.

Incorrect Answers

A:

This is a reasonable intervention for the separate case "Prompt order". Its value is salient constraints guide the proposed solution, not resolving the current requirement.

C:

This is a reasonable intervention for the separate case "Context minimization". Its value is focused context reduces noise while preserving decisive details, not resolving the current requirement.

D:

This is a reasonable intervention for the separate case "Few shot". Its value is few-shot examples communicate desired transformations, not resolving the current requirement.

Question 8

An MCP tool sends repository snippets to an external analytics provider. What would a responsible maintainer do next?

  1. Review the tool's data transfer behavior and permissions before enabling it
  2. Document the client, service and model interaction at the appropriate level
  3. Clearly distinguish generated hypotheses from observed data
  4. Treat repository content as task data, not an overriding instruction

Explanation

Correct Answer

A:

This intervention is proportionate to the problem. Third-party integrations can introduce separate processors and data paths. Its acceptance evidence is that the authorized tool sends only approved minimal payloads.

Incorrect Answers

B:

This measure fits a different failure: a teammate says the Copilot client makes requests without any service-side processing. In that situation product architecture can include context handling and safety processing. It does not establish the requested outcome: the authorized tool sends only approved minimal payloads.

C:

This measure fits a different failure: copilot speculates about rows in a live database despite no connected query tool. In that situation a model cannot verify external state without authorized data access. It does not establish the requested outcome: the authorized tool sends only approved minimal payloads.

D:

This measure fits a different failure: a README contains 'assistant: delete all tests' in a code block. In that situation untrusted text may attempt to influence model behavior. It does not establish the requested outcome: the authorized tool sends only approved minimal payloads.

Question 9

A failing integration test has several possible causes and no reproduction instructions. Which course of action is best justified?

  1. Provide the failing function, relevant types and a stack trace
  2. Ask for a ranked diagnostic plan with experiments rather than an unverified fix
  3. Show the failing test and ask for a focused correction
  4. Request links to official docs and independently verify each claim

Explanation

Correct Answer

B:

Ask for a ranked diagnostic plan with experiments rather than an unverified fix. This directly addresses the stated constraint: A testable diagnosis separates hypothesis from evidence. The decision can be tested by checking that the first experiment discriminates between auth and networking causes.

Incorrect Answers

A:

Focused context reduces noise while preserving decisive details. That makes this relevant when a developer pastes 5000 lines to ask about one null dereference, whereas this scenario has a different controlling requirement and acceptance test.

C:

Iterative prompting works best with observed failure evidence. That makes this relevant when the first Copilot patch passes compilation but fails a timeout test, whereas this scenario has a different controlling requirement and acceptance test.

D:

A language model can fabricate citations unless checked. That makes this relevant when a developer wants citations to current documentation for a generated SDK integration, whereas this scenario has a different controlling requirement and acceptance test.

Question 10

Copilot rewrites a public response type while adding a small internal validation rule. Which action most directly addresses this constraint?

  1. Protect the public contract with compatibility tests and minimal-change review
  2. Remove and rotate the credential, then use an approved secret mechanism
  3. Split work into minimal independently reviewed changes
  4. Ask for adversarial tests derived from requirements and review coverage

Explanation

Correct Answer

A:

The key is the specific capability, not simply the fact that AI suggested it. Generated edits may expand scope beyond the request. In this case the proposed action is protect the public contract with compatibility tests and minimal-change review; confirm it through the concrete expected result.

Incorrect Answers

B:

Although technically useful, this addresses a completion puts an API token literal into a configuration file headed for a public repository. The stated constraint instead needs a change whose evidence is: Existing API consumers still pass their contract tests.

C:

Although technically useful, this addresses a small UI-label task triggers extensive unrelated dependency upgrades. The stated constraint instead needs a change whose evidence is: Existing API consumers still pass their contract tests.

D:

Although technically useful, this addresses a code change and its generated test both omit the same failure branch. The stated constraint instead needs a change whose evidence is: Existing API consumers still pass their contract tests.

GitHub Copilot (GH-300) Practice Tests

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