Learn the vocabulary of scanning a program's code structure for bugs and security issues before it ever runs.
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At standup, a dev mentions scanning source code for bugs, style violations, and security issues by examining the code's structure directly, without ever executing the program. What is this technique called?
Static analysis is exactly this: static analysis scans a program's source code, examining its structure, control flow, and data flow directly, to find bugs, style violations, and security issues without ever executing the program. A hash collision is an unrelated hash-table concept about two keys sharing a bucket. This examine-without-executing approach is exactly why static analysis can catch a class of bugs, like null-pointer paths or unreachable code, before the program ever runs against real input.
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During a design review, the team adds static analysis to the CI pipeline, specifically because scanning the code's structure directly can flag a whole class of bugs before the program ever runs against real input, unlike tests that only catch what they happen to execute. Which capability does this provide?
Static analysis here provides Bug detection before runtime across code paths tests may never exercise, since it examines every code path structurally instead of relying on a test happening to execute the exact buggy path at runtime. A test suite only catches issues in the code paths it happens to execute at runtime, leaving untested paths unchecked. This examine-every-path-structurally behavior is exactly why static analysis catches classes of bugs, like unreachable code or certain null-pointer paths, that a test suite alone can miss.
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In a code review, a dev notices a CI pipeline relies solely on the test suite to catch bugs, with no static analysis step scanning the code's structure for issues in paths the tests never happen to exercise. What does this represent?
This is a missed static-analysis opportunity, since scanning the code's structure directly would flag issues in code paths the test suite never happens to exercise, instead of relying solely on runtime test coverage. A cache eviction policy is an unrelated concept about discarded cache entries. This tests-only pattern is exactly the kind of coverage gap a reviewer flags once the codebase is large enough for untested paths to be likely.
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An incident report shows a bug shipped to production in a code path the test suite never happened to exercise, because the CI pipeline relied solely on tests with no static analysis step scanning the code's structure. What practice would prevent this?
Adding static analysis scans the code's structure for issues in paths the test suite never exercises. Continuing to rely solely on the test suite regardless of how many code paths the tests actually exercise is exactly what caused the issue described in this incident. This static-analysis step is the standard fix once a bug is confirmed to have shipped through a code path the tests never covered.
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During a PR review, a teammate asks why the team adds static analysis on top of an already solid test suite. What is the reasoning?
A test suite only catches bugs in the code paths it actually executes at runtime, while static analysis examines the code's structure directly and can flag issues in paths the tests never exercise, making the two complementary rather than redundant. This is exactly why thorough CI pipelines combine both, rather than treating either one as a full substitute for the other.