Three simple steps to measure velocity in a software project:

• Estimate your requirements using a size metric.
• Agree on the concept of done.
• Define a timebox size.

Then we just need the formula:

Velocity = Points done / Timebox

Just to clarify:

• Integration test: modules of the system are tested together, as a group.
• Integration build: modifications made by developers are consolidated through a full build.

Although the integration build may include running integration tests, they’re are clearly two separate problems.