diff --git a/.github/workflows/android-beta.yaml b/.github/workflows/android-beta.yaml
index 6025d0c415..9586cf580d 100644
--- a/.github/workflows/android-beta.yaml
+++ b/.github/workflows/android-beta.yaml
@@ -1,14 +1,37 @@
-name: Beta
+name: Android Beta
 on:
   push:
     branches:
       - master
+    paths-ignore:
+      - .github/workflows/linux*
+      - .github/workflows/ios*
+      - '**/*_tests/**'
+      - CONTRIBUTORS
+      - LICENSE
+      - NOTICE
+      - README.md
+      - docs/**
+      - generator/**
+      - iphone/**
+      - packaging/**
+      - pyhelpers/**
+      - qt*/**
+      - skin_generator/**
+      - track_generator/**
+      - xcode/**
 
 jobs:
   android-beta:
     name: Android Beta
     runs-on: ubuntu-latest
     steps:
+      - name: Install build tools and dependencies
+        shell: bash
+        run: |
+          sudo apt-get update -y
+          sudo apt-get install -y ninja-build
+
       - name: Set up JDK 1.8
         uses: actions/setup-java@v1
         with:
@@ -19,8 +42,7 @@ jobs:
 
       - name: Parallel submodules checkout
         shell: bash
-        run: |
-          git submodule update --init --recursive --jobs=10
+        run: git submodule update --init --recursive --jobs=$(($(nproc) * 2))
 
       - name: Checkout private keys
         uses: actions/checkout@v2
@@ -37,22 +59,16 @@ jobs:
           ./configure.sh ./private.git
           rm -rf ./private.git
 
-      - name: Remove old outputs
-        shell: bash
-        run: |
-          rm -rf android/build/outputs/
-
       - name: Set up SDK
         shell: bash
-        run: |
-          (cd tools/android; ./set_up_android.py --sdk $ANDROID_SDK_ROOT)
+        run: (cd tools/android; ./set_up_android.py --sdk $ANDROID_SDK_ROOT)
 
       - name: Compile
         shell: bash
         working-directory: android
         run: |
-          export PATH="$(dirname $ANDROID_SDK_ROOT/cmake/*/bin/.|tail -n1):$PATH" # Use CMake from SDK
-          echo $PATH
+          #export PATH="$(dirname $ANDROID_SDK_ROOT/cmake/*/bin/.|tail -n1):$PATH" # Use CMake from SDK
+          #echo $PATH
           cmake --version
           ninja --version
           ./gradlew -PsplitApk=true -x lint -x lintVitalWebBeta assembleWebBeta uploadCrashlyticsSymbolFileWebBeta
diff --git a/.github/workflows/android-check.yaml b/.github/workflows/android-check.yaml
index 210011ca58..39a0df6564 100644
--- a/.github/workflows/android-check.yaml
+++ b/.github/workflows/android-check.yaml
@@ -1,12 +1,35 @@
-name: Check
+name: Android Check
 on:
   pull_request:
+    paths-ignore:
+      - .github/workflows/linux*
+      - .github/workflows/ios*
+      - '**/*_tests/**'
+      - CONTRIBUTORS
+      - LICENSE
+      - NOTICE
+      - README.md
+      - docs/**
+      - generator/**
+      - iphone/**
+      - packaging/**
+      - pyhelpers/**
+      - qt*/**
+      - skin_generator/**
+      - track_generator/**
+      - xcode/**
 
 jobs:
   android-check:
-    name: Android Check
+    name: Build Android Debug
     runs-on: ubuntu-latest
     steps:
+      - name: Install build tools and dependencies
+        shell: bash
+        run: |
+          sudo apt-get update -y
+          sudo apt-get install -y ninja-build
+
       - name: Set up JDK 1.8
         uses: actions/setup-java@v1
         with:
@@ -17,25 +40,22 @@ jobs:
 
       - name: Parallel submodules checkout
         shell: bash
-        run: |
-          git submodule update --init --recursive --jobs=10
+        run: git submodule update --init --recursive --jobs=$(($(nproc) * 2))
 
       - name: Configure in Open Source mode
         shell: bash
-        run: |
-          ./configure.sh
+        run: ./configure.sh
 
       - name: Set up SDK
         shell: bash
-        run: |
-          (cd tools/android; ./set_up_android.py --sdk $ANDROID_SDK_ROOT)
+        run: (cd tools/android; ./set_up_android.py --sdk $ANDROID_SDK_ROOT)
 
       - name: Compile
         shell: bash
         working-directory: android
         run: |
-          export PATH="$(dirname $ANDROID_SDK_ROOT/cmake/*/bin/.|tail -n1):$PATH" # Use CMake from SDK
-          echo $PATH
+          #export PATH="$(dirname $ANDROID_SDK_ROOT/cmake/*/bin/.|tail -n1):$PATH" # Use CMake from SDK
+          #echo $PATH
           cmake --version
           ninja --version
           ./gradlew -Parm64 assembleWebDebug
diff --git a/.github/workflows/desktop-check.yaml b/.github/workflows/desktop-check.yaml
deleted file mode 100644
index 7fb02ec63b..0000000000
--- a/.github/workflows/desktop-check.yaml
+++ /dev/null
@@ -1,55 +0,0 @@
-name: Check
-on:
-  pull_request:
-
-jobs:
-  desktop-check:
-    name: Desktop Check
-    runs-on: ubuntu-latest
-    steps:
-      - name: Checkout sources
-        uses: actions/checkout@v2
-
-      - name: Parallel submodules checkout
-        shell: bash
-        run: |
-          git submodule update --init --recursive --jobs=10
-
-      - name: Configure
-        shell: bash
-        run: |
-          ./configure.sh
-
-      - name: Install dependencies
-        shell: bash
-        run: |
-          sudo apt-get update && sudo apt-get install -y \
-              build-essential \
-              cmake \
-              clang \
-              ccache \
-              python \
-              qtbase5-dev \
-              libqt5svg5-dev \
-              libc++-dev \
-              libboost-iostreams-dev \
-              libglu1-mesa-dev \
-              libsqlite3-dev \
-              zlib1g-dev
-
-      - name: Restore cache
-        uses: actions/cache@v2
-        with:
-          path: ~/.ccache
-          key: desktop-cache
-
-      - name: Compile
-        shell: bash
-        run: |
-          export PATH="/usr/lib/ccache:${PATH}"
-          ccache -M 4G
-          (mkdir -p build && cd build && cmake .. -DCMAKE_BUILD_TYPE=RelWithDebInfo && make desktop -j $(($(nproc)*2)))
-
-#      - name: Test
-#        shell: bash
-#        run: ./tools/python/run_desktop_tests.py -f build/ -e generator_integration_tests,opening_hours_integration_tests,opening_hours_supported_features_tests,routing_consistency_tests,routing_integration_tests,routing_quality_tests,storage_integration_tests
diff --git a/.github/workflows/ios-check.yaml b/.github/workflows/ios-check.yaml
index de1eeea619..f8cc937540 100644
--- a/.github/workflows/ios-check.yaml
+++ b/.github/workflows/ios-check.yaml
@@ -1,27 +1,39 @@
-name: Check
+name: iOS Check
 on:
   pull_request:
+    paths-ignore:
+    - .github/workflows/android*
+    - .github/workflows/linux*
+    - '**/*_tests/**'
+    - '**/CMakeLists.txt'
+    - CONTRIBUTORS
+    - LICENSE
+    - NOTICE
+    - README.md
+    - android/**
+    - docs/**
+    - generator/**
+    - packaging/**
+    - pyhelpers/**
+    - qt*/**
+    - skin_generator/**
+    - track_generator/**
 
 jobs:
   ios-check:
-    name: iOS Check
+    name: Build iOS Debug
     runs-on: macos-latest
     steps:
       - name: Checkout sources
         uses: actions/checkout@v2
-        with:
-          submodules: recursive
+
+      - name: Parallel submodules checkout
+        shell: bash
+        run: git submodule update --init --recursive --jobs=4
 
       - name: Configure
         shell: bash
-        run: |
-          ./configure.sh
-
-      - name: Restore cache
-        uses: actions/cache@v2
-        with:
-          path: ~/Library/Developer/Xcode/DerivedData/omim-*/Build
-          key: macos-cache
+        run: ./configure.sh
 
       - name: Compile
         shell: bash
diff --git a/.github/workflows/linux-check.yaml b/.github/workflows/linux-check.yaml
new file mode 100644
index 0000000000..3ec8549a16
--- /dev/null
+++ b/.github/workflows/linux-check.yaml
@@ -0,0 +1,88 @@
+name: Linux Check
+on:
+  pull_request:
+    paths-ignore:
+      - .github/workflows/android*
+      - .github/workflows/ios*
+      - CONTRIBUTORS
+      - LICENSE
+      - NOTICE
+      - README.md
+      - android/**
+      - docs/**
+      - iphone/**
+      - packaging/**
+      - pyhelpers/**
+      - xcode/**
+
+jobs:
+  linux-debug:
+    name: Linux Debug Build and Test
+    runs-on: ubuntu-latest
+    env:
+      CC: gcc-10
+      CXX: g++-10
+
+    steps:
+      - name: Checkout sources
+        uses: actions/checkout@v2
+
+      - name: Parallel submodules checkout
+        shell: bash
+        run: git submodule update --init --recursive --jobs=$(($(nproc) * 2))
+
+      - name: Install build tools and dependencies
+        shell: bash
+        run: |
+          sudo apt-get install -y \
+              ninja-build \
+              qtbase5-dev \
+              libqt5svg5-dev
+
+      - name: Configure
+        shell: bash
+        run: ./configure.sh
+
+      - name: CMake
+        shell: bash
+        # -g1 should slightly reduce build time.
+        run: cmake . -B build -G Ninja -DCMAKE_BUILD_TYPE=Debug -DCMAKE_CXX_FLAGS_DEBUG=-g1
+
+      - name: Compile
+        shell: bash
+        working-directory: build
+        run: ninja
+
+      - name: Checkout world_feed_integration_tests_data
+        uses: actions/checkout@v2
+        with:
+          repository: omapsapp/world_feed_integration_tests_data
+          path: data/world_feed_integration_tests_data
+
+      - name: Tests
+        shell: bash
+        # generator_integration_tests - https://github.com/omapsapp/omapsapp/issues/225
+        # partners_api_tests - https://github.com/omapsapp/omapsapp/issues/218
+        # routing_integration_tests - https://github.com/omapsapp/omapsapp/issues/221
+        # routing_quality_tests - https://github.com/omapsapp/omapsapp/issues/215
+        # drape_tests - requires X Window
+        run: |
+          ./tools/python/run_desktop_tests.py \
+            -f ./build \
+            -u ./data \
+            -d ./data \
+            -e generator_integration_tests \
+            -e partners_api_tests \
+            -e routing_integration_tests \
+            -e routing_quality_tests \
+            -e world_feed_integration_tests \
+            -e drape_tests \
+            -e shaders_tests \
+                            \
+            -e routing_tests \
+            -e generator_tests \
+            -e opening_hours_tests \
+            -e opening_hours_integration_tests \
+            -e routing_consistency_tests \
+            -e opening_hours_supported_features_tests \
+            -e storage_integration_tests \
diff --git a/docs/INSTALL.md b/docs/INSTALL.md
index 14041f3a9a..f54e305ce7 100644
--- a/docs/INSTALL.md
+++ b/docs/INSTALL.md
@@ -153,7 +153,37 @@ and run
 
 ### Testing
 
-Run tests from the binary directory with `omapsapp/tools/unix/run_tests.sh`.
+Compile all unit tests in Debug mode:
+
+```bash
+cmake . -B build -G Ninja -DCMAKE_BUILD_TYPE=Debug
+cmake --build build --target all
+```
+
+Run all unit tests:
+
+```bash
+cd build
+../tools/python/run_desktop_tests.py -f . -u ../data/ -d ../data/
+```
+
+To run a limited set of tests, use `-i` flag. To exclude some tests, use `-e` flag:
+
+```bash
+cd build
+../tools/python/run_desktop_tests.py -f . -u ../data/ -d ../data/ -i base_tests,coding_tests
+../tools/python/run_desktop_tests.py -f . -u ../data/ -d ../data/ -e routing_integration_tests
+```
+
+When developing, it is more convenient to use a symlink:
+
+```bash
+cd build
+ln -s ../data/ data
+./coding_tests
+```
+
+Some tests [are known to be broken](https://github.com/omapsapp/omapsapp/issues?q=is%3Aissue+is%3Aopen+label%3ATests).
 
 ## Android app
 
diff --git a/tools/unix/run_tests.sh b/tools/unix/run_tests.sh
old mode 100755
new mode 100644