Purpose of Test Strategy

Reason number 1: The number one reason of writing a test strategy document is to “have” a signed, sealed, and delivered, FDA (or FAA) approved document, where the document includes a written testing methodology, test plan, and test cases.
Reason number 2: Having a test strategy does satisfy one important step in the software testing process.
Reason number 3: The test strategy document tells us how the software product will be tested.
Reason number 4: The creation of a test strategy document presents an opportunity to review the test plan with the project team.
Reason number 5: The test strategy document describes the roles, responsibilities, and the resources required for the test and schedule constraints.
Reason number 6: When we create a test strategy document, we have to put into writing any testing issues requiring resolution (and usually this means additional negotiation at the project management level).
Reason number 7: The test strategy is decided first, before lower level decisions are made on the test plan, test design, and other testing issues.

Estimating Testing Effort

Time Estimation method for Testing ProcessNote : following method is based on use case driven specification.
Step 1 : count number of use cases (NUC) of system
step 2 : Set Avg Time Test Cases(ATTC) as per test plan
step 3 : Estimate total number of test cases (NTC)Total number of test cases = Number of usecases X Avg testcases per a use case
Step 4 : Set Avg Execution Time (AET) per a test case (idelly 15 min depends on your system)Step 5 : Calculate Total Execution Time (TET)TET = Total number of test cases * AET
Step 6 : Calculate Test Case Creation Time (TCCT)useually we will take 1.5 times of TET as TCCTTCCT = 1.5 * TET
Step 7 : Time for ReTest Case Execution (RTCE) this is for retestinguseually we take 0.5 times of TETRTCE = 0.5 * TET
Step 8 : Set Report generation Time (RGTusually we take 0.2 times of TETRGT = 0.2 * TET
Step 9 : Set Test Environment Setup Time (TEST)it also depends on test plan
Step 10 : Total Estimation time = TET + TCCT+ RTCE + RGT + TEST + some buffer…;)Example
Total No of use cases (NUC) : 227
Average test cases per Use cases(AET) : 10
Estimated Test cases(NTC) : 227 * 10 = 2270
Time estimation execution (TET) : 2270/4 = 567.5 hr
Time for creating testcases (TCCT) : 567.5*4/3 = 756.6 hr
Time for retesting (RTCE) : 567.5/2 = 283.75 hr
Report Generation(RGT) = 100 hr
Test Environment Setup Time(TEST) = 20 hr.——————-
Total Hrs 1727.85 + buffer——————-
here 4 means Number of testcases executed per houri.e 15 min will take for execution of each test case