diff --git a/.github/workflows/check.yml b/.github/workflows/check.yml
index b69d2f2b..af53c74e 100644
--- a/.github/workflows/check.yml
+++ b/.github/workflows/check.yml
@@ -1,3 +1,5 @@
+# https://docs.github.com/en/actions/reference/workflows-and-actions/workflow-syntax
+# https://docs.github.com/en/actions/reference/runners/github-hosted-runners
 name: Build Analyze Check
 on: [push, pull_request]
 jobs:
@@ -16,25 +18,47 @@ jobs:
         run: cmake -B build
       - name: Build
         run: cmake --build build
+      - name: Test
+        run: |
+          cmake --build build --target test || \
+          { cat build/Testing/Temporary/LastTest.log && false; }
 
   build_check_job:
     runs-on: ubuntu-latest
-    name: Build with CMake
+    strategy:
+      fail-fast: false
+      matrix:
+        cmake-generator: [Unix Makefiles, Ninja]
+        cmake-build-type: [Debug, Release]
+    name: Build ${{ matrix.cmake-build-type }} ${{ matrix.cmake-generator }}
     steps:
       - uses: actions/checkout@v5
-      - name: Setup
+      - name: Apt Update
+        run: sudo apt-get update -q -y --no-install-recommends
+      - name: Install Build Tools
+        run: sudo apt-get install -q -y --no-install-recommends cmake ninja-build
+      - name: Install Libraries
+        run: sudo apt-get install -q -y --no-install-recommends libsoapysdr-dev librtlsdr-dev
+      - name: Versions
         run: |
-          sudo apt-get update -q -y
-          sudo apt-get install -q -y --no-install-recommends cmake ninja-build
-          sudo apt-get install -q -y libsoapysdr-dev librtlsdr-dev
-      - name: Configure CMake+Ninja
-        run: cmake -GNinja -B ${{ runner.workspace }}/b/ninja -DENABLE_RTLSDR=OFF -DENABLE_SOAPYSDR=OFF
-      - name: Build CMake+Ninja
-        run: cmake --build ${{ runner.workspace }}/b/ninja
-      - name: Configure CMake+UnixMakefiles
-        run: cmake -G"Unix Makefiles" -B ${{ runner.workspace }}/b/unixmakefiles -DENABLE_RTLSDR=OFF -DENABLE_SOAPYSDR=OFF
-      - name: Build CMake+UnixMakefiles
-        run: cmake --build ${{ runner.workspace }}/b/unixmakefiles
+          cmake --version
+          lsb_release -a
+          make --version
+          echo Ninja Version: $(ninja --version)
+          uname -a
+      - name: Configure
+        run: |
+          cmake \
+            -B build \
+            -DCMAKE_BUILD_TYPE=${{ matrix.cmake-build-type }} \
+            -DENABLE_RTLSDR=OFF -DENABLE_SOAPYSDR=OFF \
+            -G "${{ matrix.cmake-generator }}"
+      - name: Build
+        run: cmake --build build
+      - name: Test
+        run: |
+          cmake --build build --target test || \
+          { cat build/Testing/Temporary/LastTest.log && false; }
 
   doc_check_job:
     runs-on: ubuntu-latest
diff --git a/.gitignore b/.gitignore
index 53a8634e..83ca7751 100644
--- a/.gitignore
+++ b/.gitignore
@@ -35,3 +35,6 @@ cmake-build-debug/
 # File manager files
 .DS_Store
 .history
+
+# Precompiled headers
+*.h.pch
diff --git a/tests/CMakeLists.txt b/tests/CMakeLists.txt
index 2f83c87b..ec6fa249 100644
--- a/tests/CMakeLists.txt
+++ b/tests/CMakeLists.txt
@@ -33,6 +33,24 @@ endforeach(testSrc)
 # Define integration tests
 ########################################################################
 add_test(rtl_433_help ../src/rtl_433 -h)
+add_test(flex_decoder_help ../src/rtl_433 -X)
+add_test(flex_decoder bash -c
+    "touch empty_file.cu8 && \
+    ../src/rtl_433 \
+        -X n=name,m=FSK_PCM,s=10,l=10,r=10240 \
+        -r empty_file.cu8")
+# Borrowed from: https://github.com/merbanan/rtl_433/pull/786#issuecomment-410513334
+add_test(flex_decoder_w_getter bash -c
+    "touch empty_file.cu8 && \
+    ../src/rtl_433 \
+        -X 'n=name,m=FSK_PCM,s=10,l=10,r=10240,get=@20:{12}0x7f:status:[10:pir 14:open 7:close 11:tamper 0xf:battery_low]' \
+        -r empty_file.cu8")
+# Borrowed from: https://github.com/merbanan/rtl_433/pull/1532#issue-728103584
+add_test(flex_decoder_w_getter_and_format_specifier bash -c
+    "touch empty_file.cu8 && \
+    ../src/rtl_433 \
+        -X 'n=name,m=FSK_PCM,s=10,l=10,r=10240,get=@2:{32}:code:%x' \
+        -r empty_file.cu8")
 
 # Black-box test of the HTTP/WS API server. Starts rtl_433 in manual device
 # mode (no SDR), exercises each endpoint, and shuts it down cleanly. Skipped