Software testing: My classroom Thoughts "two" equivalence class division

Equivalence class

The so-called equivalence class refers to a disjoint subset of the input fields, and the set of all equivalence classes is the entire input domain. The goal is to test the non-redundancy of the use case.

Method of equivalence class partitioning

Common principles of equivalence class partitioning

(1) divided by interval

(2) divided by numerical value

(3) divided by numerical value set

(4) by restrictive conditions or rules

(5) Subdivision equivalence class

Design method of test case

(1) After the equivalence class is established, all the partitioned equivalence class tables can be listed.

(2) A unique number is specified for each equivalence class.

(3) Design a new test case so that it overwrites as many valid equivalence classes as they have not yet covered. Repeat this step until the test case overrides all valid equivalence classes.

(4) Design a new test case to overwrite and overwrite only one invalid equivalence class that has not yet been overwritten. Repeat this step until the test case overrides all invalid equivalence classes.

Only one invalid equivalence class is introduced at a time to prevent leakage, or an invalid equivalence class to block out or terminate other valid classes.

EditBox Problems in Example

The topics are as follows:

. EditBox

Allow 1 to 6 English characters or numbers, press OK to end

Valid equivalence classes:

Length: 1 to 6

Character: a-z,a-z,0-9

Invalid equivalence class

Length: 0,7

Characters: English/numeric characters, control characters, punctuation

The design is as follows:

Partitioning equivalence classes with input criteria

Condition One length from 1 to 6

condition Two characters belong to A-Z,A-z,0-9

Number	Valid equivalence classes	Number	Invalid equivalence class
1	1 to the 6 number	5	less than 1 number
2	characters belong to A- z	6	Greater than 6 number
3	characters belong to A- z	7	Character contains control characters
4	characters belong to 0-9	8	Characters contain punctuation

Test cases for equivalence class partitioning

Number	Case	overriding equivalence classes	Expected output
1	Az0912	The	Right
2	az0912a	2,3,6	Wrong
3		5	Wrong
4	Az091,	1,2,3,8	Wrong
5	DEL91,	1,2,3,8,7	Wrong
6	DEL910	1,2,3,7	Wrong
7	111111	1,4	Right
8	Aaaaaa	The	Right
9	Aaaaaa	1,3	Right

Software testing: My classroom Thoughts "two" equivalence class division