How can I determine via the APIs that an Apex class contains test cases?

I can query ApexClass, but there is no immediate field indicating the class contains tests.

Assuming the body field content is available (not from a managed package), do I need to manually search the contents of the Body field?

Attribution to: Daniel Ballinger

Possible Suggestion/Solution #1

As far as I know there's no field to indicate the presence of test methods.

I think you're right, you'll have to scan the code by searching the body field manually (since long text fields aren't available for filtering in SOQL) for the testmethod keyword and @IsTest annotation.

You may want to cater for commented varieties too, though this might be overcomplicating the situation.

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SOSL Example to find (potential) classes containing tests.

FIND {@IsTest or testMethod} IN ALL FIELDS RETURNING ApexClass(Id, Name)

Attribution to: Matt Lacey
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