Add approvaltests to linux clang build

.github/workflows/test_verification.yml

@@ -92,12 +92,19 @@ jobs:
 
       - name: Build
         working-directory: ${{github.workspace}}/build
-        run: make OpenALpp_UnitTests OpenALpp_Integration -j 4
+        run: make OpenALpp_UnitTests OpenALpp_Integration OpenALpp_ApprovalTests -j
 
-    #      - name: Test
+    #     Commented out because one does not simply acquire a sound context
     #        run: ./OpenALpp_UnitTests --order rand
     #        working-directory: ${{github.workspace}}/build/bin/
 
+      - name: CopyAssets
+        run: cp -r ${{github.workspace}}/assets ${{github.workspace}}/build/test/approval_tests
+
+      - name: ApprovalTest
+        run: ./OpenALpp_ApprovalTests --order rand
+        working-directory: ${{github.workspace}}/build/test/approval_tests
+
   Windows:
     runs-on: windows-2019
     steps:

test/approval_tests/approval_test_helpers.cpp

@@ -0,0 +1,11 @@
+#include "approval_test_helpers.hpp"
+#include <algorithm>
+
+std::vector<int> ApprovalTestHelpers::asInt(std::vector<float> const& numbers, unsigned int digits)
+{
+    std::vector<int> numbersAsInts;
+    numbersAsInts.resize(numbers.size());
+    std::transform(numbers.cbegin(), numbers.cend(), numbersAsInts.begin(), [digits](float number)
+        {return static_cast<int>(number * digits);});
+    return numbersAsInts;
+}

test/approval_tests/approval_test_helpers.hpp

@@ -0,0 +1,9 @@
+#ifndef OPENALPP_APPROVAL_TEST_HELPERS_HPP
+#define OPENALPP_APPROVAL_TEST_HELPERS_HPP
+#include <vector>
+
+struct ApprovalTestHelpers {
+    static std::vector<int> ApprovalTestHelpers::asInt(std::vector<float> const& number, unsigned int digits);
+};
+
+#endif // OPENALPP_APPROVAL_TEST_HELPERS_HPP

test/approval_tests/effect_convolution_test.cpp

@@ -2,6 +2,7 @@
 #include "catch2/catch.hpp"
 #include "oalpp/effects/utility/convolution.hpp"
 #include "oalpp/sound_data.hpp"
+#include "approval_test_helpers.hpp"
 
 TEST_CASE("convolution")
 {
@@ -10,5 +11,7 @@ TEST_CASE("convolution")
     oalpp::effects::utility::Convolution convolution { buffer.getSamples() };
     oalpp::SoundDataWithEffect soundWithEffect { buffer, convolution };
 
-    ApprovalTests::Approvals::verifyAll(soundWithEffect.getSamples());
+    // note: Due to platform dependent float behavior, the result needs to be converted to int for
+    // the approval tests to work.
+    ApprovalTests::Approvals::verifyAll(ApprovalTestHelpers::asInt(soundWithEffect.getSamples(), 100));
 }