西维蜀黍

【Software Testing】Software Testing

Software Testing

A test case is a repeatable execution situation of a software system that produces recordable outcomes. A test is a particular attempt of a test case:

  • the outcomes may be expected
    • specified in advance, e.g., we expect passing 1+1 to a calculator to return 2
    • generally boolean outcoms (pass or fail)
  • the outcomes may be measurement results
    • e.g., we want to find the time it takes to compute 1+1
  • the outcomes should testify to some software quality
    • e.g., correctness, but also efficiency, usability, etc
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Posted by Wei on 2018-11-15, Last Modified on 2024-05-02

【Engineering】Software Quality

Defect

A defect in a software system is a quality level that is not acceptable.

Quality levels need to be elicited and negotiated.

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Posted by Wei on 2018-11-15, Last Modified on 2024-05-02

【OOP】Kind of Relations in OOP

  1. Is A (Inheritence)
  2. Has A (Composition)
  3. Works With (Collaboration)

Is A (Inheritence)

In object-oriented programming, the concept of IS-A is a totally based on Inheritance, which can be of two types Class Inheritance or Interface Inheritance.

It is just like saying “A is a B type of thing”. For example, Apple is a Fruit, Car is a Vehicle, etc. Inheritance is uni-directional. For example, House is a Building. But Building is not a House.

It is a key point to note that you can easily identify an IS-A relationship. Wherever you see an extends keyword or implements keyword in a class declaration, then this class is said to have IS-A relationship.

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Posted by Wei on 2018-11-12, Last Modified on 2024-05-02

【Database】Relationship between Tables

Relationship

One-to-one relationship

In a one-to-one relationship, one record in a table is associated with one and only one record in another table. For example, in a school database, each student has only one student ID, and each student ID is assigned to only one person.

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Posted by Wei on 2018-11-12, Last Modified on 2024-05-02

【XML】XML Schema

A Reference to an XML Schema

This XML document has a reference to an XML Schema:

<?xml version="1.0"?>

<note
xmlns="https://www.w3schools.com"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="https://www.w3schools.com/xml/note.xsd">
  <to>Tove</to>
  <from>Jani</from>
  <heading>Reminder</heading>
  <body>Don't forget me this weekend!</body>
</note>
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Posted by Wei on 2018-11-12, Last Modified on 2024-05-02

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