diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 92703a3..d0cea54 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -19,15 +19,14 @@ jobs:
         run: sudo apt-get install -y libgtest-dev libgmock-dev clang-tidy lcov #clang-format
 
       - name: Configure CMake
-        run: |
-          rm -rf build
-          mkdir build
-          cd build
+        run: | # ensures a fresh environment for each build
+          mkdir -p build
+          cd build 
           cmake -DCMAKE_EXPORT_COMPILE_COMMANDS=ON -DCMAKE_CXX_STANDARD=20 ..
 
       - name: Build Main Executable and Test Executable
-        run: |
-          cd build
+        run: | 
+          cd build 
           make
 
     #  - name: Analyze code with clang-tidy
@@ -44,7 +43,7 @@ jobs:
       - name: Run all Tests
         run: |
           cd build
-          ctest -R AllTests --output-on-failure
+          ctest --output-on-failure
 
     #  - name: Generate code coverage
     #    run: |
diff --git a/cmake-build-cmake/.ninja_log b/cmake-build-cmake/.ninja_log
index 2f1583f..ca6fff4 100644
--- a/cmake-build-cmake/.ninja_log
+++ b/cmake-build-cmake/.ninja_log
@@ -33,3 +33,5 @@
 30	224	1721111159292832750	/Users/anthony/CLionProjects/Option_pricer/cmake-build-cmake/tests/CMakeFiles/Tests	51903612152c3c7d
 49	278	1721112733607081719	tests/CMakeFiles/Tests	51903612152c3c7d
 49	278	1721112733607081719	/Users/anthony/CLionProjects/Option_pricer/cmake-build-cmake/tests/CMakeFiles/Tests	51903612152c3c7d
+41	262	1721114972327539687	tests/CMakeFiles/Tests	51903612152c3c7d
+41	262	1721114972327539687	/Users/anthony/CLionProjects/Option_pricer/cmake-build-cmake/tests/CMakeFiles/Tests	51903612152c3c7d
diff --git a/cmake-build-cmake/Testing/Temporary/LastTest.log b/cmake-build-cmake/Testing/Temporary/LastTest.log
index e2b1650..969c4aa 100644
--- a/cmake-build-cmake/Testing/Temporary/LastTest.log
+++ b/cmake-build-cmake/Testing/Temporary/LastTest.log
@@ -1,77 +1,3 @@
-Start testing: Jul 16 08:52 CEST
+Start testing: Jul 16 09:29 CEST
 ----------------------------------------------------------
-1/2 Testing: UnitTests
-1/2 Test: UnitTests
-Command: "/Users/anthony/CLionProjects/Option_pricer/cmake-build-cmake/tests/unit/Unit_tests"
-Directory: /Users/anthony/CLionProjects/Option_pricer/cmake-build-cmake/tests/unit
-"UnitTests" start time: Jul 16 08:52 CEST
-Output:
-----------------------------------------------------------
-[==========] Running 12 tests from 4 test suites.
-[----------] Global test environment set-up.
-[----------] 6 tests from MarketDataTest
-[ RUN      ] MarketDataTest.SingletonInstance
-[       OK ] MarketDataTest.SingletonInstance (0 ms)
-[ RUN      ] MarketDataTest.NotifyObserver
-[       OK ] MarketDataTest.NotifyObserver (0 ms)
-[ RUN      ] MarketDataTest.NotifyAllObservers
-[       OK ] MarketDataTest.NotifyAllObservers (0 ms)
-[ RUN      ] MarketDataTest.AddAndUpdateStockData
-[       OK ] MarketDataTest.AddAndUpdateStockData (0 ms)
-[ RUN      ] MarketDataTest.UpdateNonExistentStock
-[       OK ] MarketDataTest.UpdateNonExistentStock (0 ms)
-[ RUN      ] MarketDataTest.RiskFreeRate
-[       OK ] MarketDataTest.RiskFreeRate (0 ms)
-[----------] 6 tests from MarketDataTest (0 ms total)
-
-[----------] 1 test from StockDataTest
-[ RUN      ] StockDataTest.InvalidStockData
-[       OK ] StockDataTest.InvalidStockData (0 ms)
-[----------] 1 test from StockDataTest (0 ms total)
-
-[----------] 4 tests from PayoffSingleStrikeTest
-[ RUN      ] PayoffSingleStrikeTest.PayoffCallTests
-[       OK ] PayoffSingleStrikeTest.PayoffCallTests (0 ms)
-[ RUN      ] PayoffSingleStrikeTest.PayoffPutTests
-[       OK ] PayoffSingleStrikeTest.PayoffPutTests (0 ms)
-[ RUN      ] PayoffSingleStrikeTest.PayoffDigitalCallTests
-[       OK ] PayoffSingleStrikeTest.PayoffDigitalCallTests (0 ms)
-[ RUN      ] PayoffSingleStrikeTest.PayoffDigitalPutTests
-[       OK ] PayoffSingleStrikeTest.PayoffDigitalPutTests (0 ms)
-[----------] 4 tests from PayoffSingleStrikeTest (0 ms total)
-
-[----------] 1 test from PayoffDoubleStrikesTest
-[ RUN      ] PayoffDoubleStrikesTest.PayoffDoubleDigitalTests
-[       OK ] PayoffDoubleStrikesTest.PayoffDoubleDigitalTests (0 ms)
-[----------] 1 test from PayoffDoubleStrikesTest (0 ms total)
-
-[----------] Global test environment tear-down
-[==========] 12 tests from 4 test suites ran. (0 ms total)
-[  PASSED  ] 12 tests.
-<end of output>
-Test time =   0.01 sec
-----------------------------------------------------------
-Test Passed.
-"UnitTests" end time: Jul 16 08:52 CEST
-"UnitTests" time elapsed: 00:00:00
-----------------------------------------------------------
-
-2/2 Testing: IntegrationTests
-2/2 Test: IntegrationTests
-Command: "/Users/anthony/CLionProjects/Option_pricer/cmake-build-cmake/tests/integration/Integration_tests"
-Directory: /Users/anthony/CLionProjects/Option_pricer/cmake-build-cmake/tests/integration
-"IntegrationTests" start time: Jul 16 08:52 CEST
-Output:
-----------------------------------------------------------
-[==========] Running 0 tests from 0 test suites.
-[==========] 0 tests from 0 test suites ran. (0 ms total)
-[  PASSED  ] 0 tests.
-<end of output>
-Test time =   0.01 sec
-----------------------------------------------------------
-Test Passed.
-"IntegrationTests" end time: Jul 16 08:52 CEST
-"IntegrationTests" time elapsed: 00:00:00
-----------------------------------------------------------
-
-End testing: Jul 16 08:52 CEST
+End testing: Jul 16 09:29 CEST
diff --git a/cmake-build-cmake/tests/Testing/Temporary/CTestCostData.txt b/cmake-build-cmake/tests/Testing/Temporary/CTestCostData.txt
index a447362..e08182e 100644
--- a/cmake-build-cmake/tests/Testing/Temporary/CTestCostData.txt
+++ b/cmake-build-cmake/tests/Testing/Temporary/CTestCostData.txt
@@ -1,3 +1,3 @@
-UnitTests 2 0.00937588
-IntegrationTests 2 0.00869047
+UnitTests 3 0.00582454
+IntegrationTests 3 0.00482503
 ---
diff --git a/cmake-build-cmake/tests/Testing/Temporary/LastTest.log b/cmake-build-cmake/tests/Testing/Temporary/LastTest.log
index fe36423..98fe10c 100644
--- a/cmake-build-cmake/tests/Testing/Temporary/LastTest.log
+++ b/cmake-build-cmake/tests/Testing/Temporary/LastTest.log
@@ -1,10 +1,10 @@
-Start testing: Jul 16 08:52 CEST
+Start testing: Jul 16 09:29 CEST
 ----------------------------------------------------------
 1/2 Testing: UnitTests
 1/2 Test: UnitTests
 Command: "/Users/anthony/CLionProjects/Option_pricer/cmake-build-cmake/tests/unit/Unit_tests"
 Directory: /Users/anthony/CLionProjects/Option_pricer/cmake-build-cmake/tests/unit
-"UnitTests" start time: Jul 16 08:52 CEST
+"UnitTests" start time: Jul 16 09:29 CEST
 Output:
 ----------------------------------------------------------
 [==========] Running 12 tests from 4 test suites.
@@ -52,7 +52,7 @@ Output:
 Test time =   0.02 sec
 ----------------------------------------------------------
 Test Passed.
-"UnitTests" end time: Jul 16 08:52 CEST
+"UnitTests" end time: Jul 16 09:29 CEST
 "UnitTests" time elapsed: 00:00:00
 ----------------------------------------------------------
 
@@ -60,18 +60,18 @@ Test Passed.
 2/2 Test: IntegrationTests
 Command: "/Users/anthony/CLionProjects/Option_pricer/cmake-build-cmake/tests/integration/Integration_tests"
 Directory: /Users/anthony/CLionProjects/Option_pricer/cmake-build-cmake/tests/integration
-"IntegrationTests" start time: Jul 16 08:52 CEST
+"IntegrationTests" start time: Jul 16 09:29 CEST
 Output:
 ----------------------------------------------------------
 [==========] Running 0 tests from 0 test suites.
 [==========] 0 tests from 0 test suites ran. (0 ms total)
 [  PASSED  ] 0 tests.
 <end of output>
-Test time =   0.02 sec
+Test time =   0.01 sec
 ----------------------------------------------------------
 Test Passed.
-"IntegrationTests" end time: Jul 16 08:52 CEST
+"IntegrationTests" end time: Jul 16 09:29 CEST
 "IntegrationTests" time elapsed: 00:00:00
 ----------------------------------------------------------
 
-End testing: Jul 16 08:52 CEST
+End testing: Jul 16 09:29 CEST