FIT9136 Chap.6 Modules, Libraries and Unit Testing

Modules, Libraries and Unit Testing

Define module

The course material gives this chapter a concrete anchor: Weeks 7 and 10 combine library discovery with assertions and unit-level verification. That module anchor controls how library is explained and how unit test is tested in changed practice.

Modules, Libraries and Unit Testing turns module, library and unit test into executable reasoning.

The chapter's practical target is to reuse a library through a clear interface and verify the surrounding code, so every explanation should connect syntax to program state, control flow and observable output.

Treat module as a precise program object, not a loose label. Identify the value or responsibility of module before execution, then trace what can read it, change it or depend on it.

This makes state changes visible before they become debugging guesses.

Use library to explain the program's next move. Work through one representative library input by hand and name the branch, iteration or call that follows. If the library trace cannot be stated, the code may run by accident rather than by understood design.

Bring in unit test as the test of structure.

Compare normal, boundary and invalid inputs for unit test; state the expected behaviour first; then use the mismatch between expectation and result to localise the defect.

For the application — reuse a library through a clear interface and verify the surrounding code — write the smallest complete example that exposes the rule.

Explain why the unit test result works, what would break it and how the program should signal or recover from that failure.

Trace library

Before running an example involving module, make a trace table with the important state before and after each operation. Include the value associated with module, the control decision governed by library and the output or object affected by unit test.

The module table turns an unexplained result into a sequence that can be tested one transition at a time.

Test three inputs: an ordinary case, a boundary case and an invalid case. State the expected unit test result for each before execution, then compare it with what the program actually does.

A useful test of library isolates one rule; changing several conditions at once cannot reveal which condition caused the failure.

Practise explaining the solution without reading the code. For fit9136, name the data representation, the control flow, the responsibility of each function or class and the reason the chosen design supports reuse a library through a clear interface and verify the surrounding code.

This unit test rehearsal matters when a written test or interview asks why the program works rather than whether it produces one correct output.

A complete response should make the task visible before the detail: identify what must be decided, define the relevant terms, connect the evidence to library, and use unit test to test the result.

The final sentence about unit test should answer the question actually asked rather than merely repeat the topic.

The controlling limit is specific: Library availability does not prove correct arguments, units or interpretation.

Keep that unit test limit beside the worked example, because it separates a careful fit9136 answer from one that sounds confident but claims more than the task or evidence supports.

For revision, retrieve module, library and unit test without notes, explain their relationship aloud, then complete a changed version of the application: reuse a library through a clear interface and verify the surrounding code.

Record the first failed library reasoning move and repair it before attempting another case.

What this chapter covers

• 01

  module

• 02

  library

• 03

  unit test

• 04

  Applying module

• 05

  Limits of library and unit test

Test a discount function

Key terms

module

Python file or package namespace containing reusable definitions. This chapter uses the concept when students reuse a library through a clear interface and verify the surrounding code. Use this definition when the task is to reuse a library through a clear interface and verify the surrounding code.

library

Organised collection of modules providing tested capabilities. It helps explain the reasoning required to reuse a library through a clear interface and verify the surrounding code. Use this definition when the task is to reuse a library through a clear interface and verify the surrounding code.

unit test

Automated check of one small behaviour under declared input and expected output. Its limit matters because library availability does not prove correct arguments, units or interpretation. Use this definition when the task is to reuse a library through a clear interface and verify the surrounding code.

Modules, Libraries and Unit Testing FAQ

Assessment move

Reconstruct the relationship among module, library and unit test; complete the chapter application without notes; then test the result against this limit: Library availability does not prove correct arguments, units or interpretation.

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