Add support for unit testing

* Downgraded macOS CI to Qt 6.2.0 due to a bug in Qt Test module
* Revised cmake build scripts
* For now, only building via cmake is supported

PR #17338.

.github/workflows/ci_macos.yaml

@@ -16,10 +16,10 @@ jobs:
       matrix:
         libt_version: ["2.0.6", "1.2.16"]
         qbt_gui: ["GUI=ON", "GUI=OFF"]
-        qt_version: ["5.15.2", "6.3.0"]
+        qt_version: ["5.15.2", "6.2.0"]
         exclude:
           - libt_version: "1.2.16"
-            qt_version: "6.3.0"
+            qt_version: "6.2.0"
 
     env:
       boost_path: "${{ github.workspace }}/../boost"
@@ -87,10 +87,12 @@ jobs:
             -DCMAKE_EXPORT_COMPILE_COMMANDS=ON \
             -DBOOST_ROOT="${{ env.boost_path }}" \
             -DOPENSSL_ROOT_DIR="${{ env.openssl_root }}" \
+            -DTESTING=ON \
             -DVERBOSE_CONFIGURE=ON \
             -D${{ matrix.qbt_gui }}
           cmake --build build --target qbt_update_translations
           cmake --build build
+          cmake --build build --target check
 
       - name: Build qBittorrent (Qt6)
         if: ${{ startsWith(matrix.qt_version, 6) }}
@@ -103,10 +105,12 @@ jobs:
             -DBOOST_ROOT="${{ env.boost_path }}" \
             -DOPENSSL_ROOT_DIR="${{ env.openssl_root }}" \
             -DQT6=ON \
+            -DTESTING=ON \
             -DVERBOSE_CONFIGURE=ON \
             -D${{ matrix.qbt_gui }}
           cmake --build build --target qbt_update_translations
           cmake --build build
+          cmake --build build --target check
 
       - name: Prepare build artifacts
         run: |

.github/workflows/ci_ubuntu.yaml

@@ -70,10 +70,12 @@ jobs:
             -DCMAKE_BUILD_TYPE=RelWithDebInfo \
             -DCMAKE_EXPORT_COMPILE_COMMANDS=ON \
             -DCMAKE_INSTALL_PREFIX="/usr" \
+            -DTESTING=ON \
             -DVERBOSE_CONFIGURE=ON \
             -D${{ matrix.qbt_gui }}
           cmake --build build --target qbt_update_translations
           cmake --build build
+          cmake --build build --target check
           DESTDIR="qbittorrent" cmake --install build
 
       - name: Build qBittorrent (Qt6)
@@ -86,10 +88,12 @@ jobs:
             -DCMAKE_EXPORT_COMPILE_COMMANDS=ON \
             -DCMAKE_INSTALL_PREFIX="/usr" \
             -DQT6=ON \
+            -DTESTING=ON \
             -DVERBOSE_CONFIGURE=ON \
             -D${{ matrix.qbt_gui }}
           cmake --build build --target qbt_update_translations
           cmake --build build
+          cmake --build build --target check
           DESTDIR="qbittorrent" cmake --install build
 
       - name: Prepare build artifacts

.github/workflows/ci_windows.yaml

@@ -115,11 +115,13 @@ jobs:
             -DLibtorrentRasterbar_DIR="${{ env.libtorrent_path }}/lib/cmake/LibtorrentRasterbar" `
             -DMSVC_RUNTIME_DYNAMIC=OFF `
             -DQT6=ON `
+            -DTESTING=ON `
             -DVCPKG_TARGET_TRIPLET=x64-windows-static-release `
             -DVERBOSE_CONFIGURE=ON `
             --graphviz=build/target_graph.dot
           cmake --build build --target qbt_update_translations
           cmake --build build
+          cmake --build build --target check
 
       - name: Prepare build artifacts
         run: |