[CMake] Setting environment before running a test

[Judicaël Bedouet]

Hello,

I have a test which must be executed in different environments. Test results
depend on values of environment variables.
Is there a way to easily set environment variables before running a test ?
Somewhat like

ADD_TEST (TestEnv1 testEnv)
SET_TEST_PROPERTIES (TestEnv1 PROPERTIES ENV TEST_ENV="testEnvValue1")
SET_TEST_PROPERTIES (TestEnv1 PROPERTIES WILL_FAIL true)

ADD_TEST (TestEnv2 testEnv)
SET_TEST_PROPERTIES (TestEnv2 PROPERTIES ENV TEST_ENV="testEnvValue2")

J. Bedouet
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