qa_sources: disable execution speed sensitive checks

Disable certain sensitive checks for the processing rate when running
the instrumented build. This is done by introducing an Environment
variable which is used to conditionally skip them:
`DISABLE_SENSITIVE_CHECKS=1 qa_sources`

.github/workflows/ci.yml

@@ -118,6 +118,8 @@ jobs:
 
       - name: execute tests with coverage
         if: matrix.configurations.compiler == 'gcc13' && matrix.cmake-build-type == 'Debug'
+        env:
+          DISABLE_SENSITIVE_TESTS: 1 # disables tests which are sensitive to execution speed and will not run with instrumented code
         working-directory: ${{runner.workspace}}/build
         shell: bash
         run: cmake --build . --target coverage

blocks/basic/test/qa_sources.cpp

@@ -54,10 +54,14 @@ const boost::ut::suite TagTests = [] {
         expect(eq(src.n_samples_produced, n_samples)) << "src did not produce enough output samples";
         expect(eq(static_cast<std::uint32_t>(sink1.n_samples_produced), n_samples)) << fmt::format("sink1 did not consume enough input samples ({} vs. {})", sink1.n_samples_produced, n_samples);
         expect(eq(static_cast<std::uint32_t>(sink2.n_samples_produced), n_samples)) << fmt::format("sink2 did not consume enough input samples ({} vs. {})", sink2.n_samples_produced, n_samples);
-        expect(approx(sink1.effective_sample_rate(), sample_rate, 500.f))
-                << fmt::format("sink1: effective sample rate {} vs {} +- {} does not match", sink1.effective_sample_rate(), sample_rate, 500.f);
-        expect(approx(sink2.effective_sample_rate(), sample_rate, 500.f))
-                << fmt::format("sink2: effective sample rate {} vs {} +- {} does not match", sink1.effective_sample_rate(), sample_rate, 500.f);
+
+        if (std::getenv("DISABLE_SENSITIVE_TESTS") != nullptr) {
+            expect(approx(sink1.effective_sample_rate(), sample_rate, 500.f))
+                    << fmt::format("sink1: effective sample rate {} vs {} +- {} does not match", sink1.effective_sample_rate(), sample_rate, 500.f);
+            expect(approx(sink2.effective_sample_rate(), sample_rate, 500.f))
+                    << fmt::format("sink2: effective sample rate {} vs {} +- {} does not match", sink1.effective_sample_rate(), sample_rate, 500.f);
+        }
+
         fmt::print("sink1 (USE_PROCESS_ONE): effective {} vs. expected {} sample rate [Hz]\n", sink1.effective_sample_rate(), sample_rate);
         fmt::print("sink2 (USE_PROCESS_BULK): effective {} vs. expected {} sample rate [Hz]\n", sink2.effective_sample_rate(), sample_rate);