Equivalence partitioning (EP) is a black box testing technique. This technique is very common and mostly used by all the testers informally. Equivalence partitions are also known as equivalence class partitioning.
As the name suggests Equivalence partitioning is to divide or to partition a set of test conditions into sets or valid and invalid groups that can be considered same while testing.
For example if you have to test a condition say Age field should only accept a number ranging from 0 and 100. You can't test for each value. As you all know that exhaustive testing of the software is not feasible task. In such cases equivalence partitioning technique is applied. Here the test data would be divided into partitions of valid and invalid range. In our case, valid range would be 0 to 100 and invalid range would be >100 and <0. While testing a data from each class or partition is considered and tested.
As the name suggests Equivalence partitioning is to divide or to partition a set of test conditions into sets or valid and invalid groups that can be considered same while testing.
For example if you have to test a condition say Age field should only accept a number ranging from 0 and 100. You can't test for each value. As you all know that exhaustive testing of the software is not feasible task. In such cases equivalence partitioning technique is applied. Here the test data would be divided into partitions of valid and invalid range. In our case, valid range would be 0 to 100 and invalid range would be >100 and <0. While testing a data from each class or partition is considered and tested.