diff --git a/.drevops/docs/.ahoy.yml b/.drevops/docs/.ahoy.yml
index 2b9dd44fa..4b174fe9c 100644
--- a/.drevops/docs/.ahoy.yml
+++ b/.drevops/docs/.ahoy.yml
@@ -39,6 +39,16 @@ commands:
     cmd: ./.utils/lint.sh
 
   test:
+    usage: Test
+    cmd: |
+      ahoy test-scripts
+      ahoy test-site
+
+  test-scripts:
+    usage: Test scripts
+    cmd: ./.utils/test.sh
+
+  test-site:
     usage: Test site
     cmd: docker compose run linkchecker http://mkdocs:8080 "$@"
 
diff --git a/.drevops/docs/.utils/.aspell.en.pws b/.drevops/docs/.utils/.aspell.en.pws
index 6b0c92c05..2a1e777b8 100644
--- a/.drevops/docs/.utils/.aspell.en.pws
+++ b/.drevops/docs/.utils/.aspell.en.pws
@@ -73,7 +73,6 @@ Ssl
 Suboptimal
 TBD
 Terminalizer
-Twig CS Fixer
 UAT
 UI
 UUID
diff --git a/.drevops/docs/.utils/.gitignore b/.drevops/docs/.utils/.gitignore
index 22d0d82f8..862e5ebf6 100644
--- a/.drevops/docs/.utils/.gitignore
+++ b/.drevops/docs/.utils/.gitignore
@@ -1 +1,3 @@
 vendor
+node_modules
+!package-lock.json
diff --git a/.drevops/docs/.utils/publish.sh b/.drevops/docs/.utils/publish.sh
index df2612a74..606508042 100755
--- a/.drevops/docs/.utils/publish.sh
+++ b/.drevops/docs/.utils/publish.sh
@@ -136,7 +136,7 @@ build() {
   echo "Copy combined dir into the container."
   docker compose cp "${combined_repo_dir}/." mkdocs:"/tmp/build"
   docker compose exec mkdocs git config --global --add safe.directory "/tmp/build"
-  # The credentials below are only used to produce some entermediate commits
+  # The credentials below are only used to produce some intermediate commits
   # while building the docs. They are not used to push the code.
   docker compose exec mkdocs git config --global user.name "Deployment robot"
   docker compose exec mkdocs git config --global user.email "robot@example.com"
diff --git a/.drevops/docs/.utils/test.sh b/.drevops/docs/.utils/test.sh
new file mode 100755
index 000000000..c4a866ea4
--- /dev/null
+++ b/.drevops/docs/.utils/test.sh
@@ -0,0 +1,40 @@
+#!/usr/bin/env bash
+##
+# Run DrevOps docs tests in CI.
+#
+# LCOV_EXCL_START
+
+set -eu
+[ "${DREVOPS_DEBUG-}" = "1" ] && set -x
+
+ROOT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")/../.." && pwd)"
+
+SCRIPTS_DIR="${ROOT_DIR}/docs/.utils"
+
+TEST_DIR="${ROOT_DIR}/docs/.utils/tests"
+
+# ------------------------------------------------------------------------------
+
+# Configure git username and email if it is not set.
+[ "$(git config --global user.name)" = "" ] && echo "==> Configuring global git user name" && git config --global user.name "Test user"
+[ "$(git config --global user.email)" = "" ] && echo "==> Configuring global git user email" && git config --global user.email "someone@example.com"
+
+# Create stub of local framework.
+docker network create amazeeio-network 2>/dev/null || true
+
+echo "==> Run docs tests."
+
+[ ! -d "${TEST_DIR}/node_modules" ] && echo "  > Installing test Node dependencies into ${TEST_DIR}." && npm --prefix="${TEST_DIR}" ci
+
+bats() {
+  pushd "${ROOT_DIR}" >/dev/null || exit 1
+  if [ -n "${DREVOPS_DEV_TEST_COVERAGE_DIR:-}" ]; then
+    mkdir -p "${DREVOPS_DEV_TEST_COVERAGE_DIR}"
+    kcov --include-pattern=.sh,.bash --bash-parse-files-in-dir="${SCRIPTS_DIR}","${TEST_DIR}" --exclude-pattern=vendor,node_modules "${DREVOPS_DEV_TEST_COVERAGE_DIR}" "${TEST_DIR}/node_modules/.bin/bats" "$@"
+  else
+    "${TEST_DIR}/node_modules/.bin/bats" "$@"
+  fi
+  popd >/dev/null || exit 1
+}
+
+bats "${TEST_DIR}/bats/docs.bats"
diff --git a/.drevops/docs/.utils/tests/bats/_helper.bash b/.drevops/docs/.utils/tests/bats/_helper.bash
new file mode 100644
index 000000000..8756c0b1b
--- /dev/null
+++ b/.drevops/docs/.utils/tests/bats/_helper.bash
@@ -0,0 +1,164 @@
+#!/usr/bin/env bash
+#
+# Helpers related to DrevOps common testing functionality.
+#
+# In some cases, shell may report platform incorrectly. Run with forced platform:
+# DOCKER_DEFAULT_PLATFORM=linux/amd64 bats --tap tests/bats/test.bats
+#
+# shellcheck disable=SC2155,SC2119,SC2120,SC2044,SC2294
+#
+
+################################################################################
+#                       BATS HOOK IMPLEMENTATIONS                              #
+################################################################################
+
+setup() {
+  # The root directory of the project.
+  export ROOT_DIR="$(dirname "$(cd "$(dirname "${BATS_TEST_DIRNAME}")/../../.." && pwd)")"
+
+  [ ! -d "${ROOT_DIR}/.drevops" ] && echo 'ERROR: The test should be run from the ".drevops" directory.' && exit 1
+
+  # Register a path to libraries.
+  export BATS_LIB_PATH="${BATS_TEST_DIRNAME}/../node_modules"
+  bats_load_library bats-helpers
+
+  ##
+  ## Application test directories structure setup.
+  ##
+
+  # To run installation tests, several fixture directories are required.
+  # They are defined and created in setup() test method.
+  #
+  # Root build directory where the rest of fixture directories located.
+  # The "build" in this context is a place to store assets produced by the
+  # installer script during the test.
+  export BUILD_DIR="${BUILD_DIR:-"${BATS_TEST_TMPDIR//\/\//\/}/drevops-$(date +%s)"}"
+
+  # Directory where the installer script is executed.
+  # May have existing project files (e.g. from previous installations) or be
+  # empty (to facilitate brand-new install).
+  export CURRENT_PROJECT_DIR="${BUILD_DIR}/star_wars"
+
+  # Directory where the installer script will be sourcing the instance of DrevOps.
+  # As a part of test setup, the local copy of DrevOps at the last commit is
+  # copied to this location. This means that during development of tests local
+  # changes need to be committed.
+  export LOCAL_REPO_DIR="${BUILD_DIR}/local_repo"
+
+  fixture_prepare_dir "${BUILD_DIR}"
+  fixture_prepare_dir "${CURRENT_PROJECT_DIR}"
+  fixture_prepare_dir "${LOCAL_REPO_DIR}"
+
+  # Allow to override debug variables from environment when developing tests.
+  export DREVOPS_DEBUG="${TEST_DREVOPS_DEBUG:-}"
+
+  ##
+  ## SUT files setup.
+  ##
+
+  # Copy DrevOps at the last commit.
+  fixture_export_codebase "${LOCAL_REPO_DIR}" "${ROOT_DIR}" >/dev/null
+
+  # Prepare global git config and ignore files required for testing cleanup scenarios.
+  prepare_global_gitconfig
+  prepare_global_gitignore
+
+  ##
+  ## Setting debug mode.
+  ##
+
+  # Print debug if "--verbose-run" is passed or TEST_DREVOPS_DEBUG is set to "1".
+  if [ "${BATS_VERBOSE_RUN:-}" = "1" ] || [ "${TEST_DREVOPS_DEBUG:-}" = "1" ]; then
+    echo "Verbose run enabled." >&3
+    echo "BUILD_DIR: ${BUILD_DIR}" >&3
+    export RUN_STEPS_DEBUG=1
+  fi
+
+  # Change directory to the current project directory for each test. Tests
+  # requiring to operate outside of CURRENT_PROJECT_DIR (like deployment tests)
+  # should change directory explicitly within their tests.
+  pushd "${CURRENT_PROJECT_DIR}" >/dev/null || exit 1
+}
+
+teardown() {
+  restore_global_gitignore
+  popd >/dev/null || cd "${ROOT_DIR}" || exit 1
+}
+
+# Print step.
+step() {
+  # Using prefix different from command prefix in SUT for easy debug.
+  echo "**> STEP: ${1}" >&3
+}
+
+# Print sub-step.
+substep() {
+  echo "     > ${1}" >&3
+}
+
+git_init() {
+  local allow_receive_update="${1:-0}"
+  local dir="${2:-$(pwd)}"
+
+  assert_not_git_repo "${dir}"
+  git --work-tree="${dir}" --git-dir="${dir}/.git" init >/dev/null
+
+  if [ "${allow_receive_update:-}" -eq 1 ]; then
+    git --work-tree="${dir}" --git-dir="${dir}/.git" config receive.denyCurrentBranch updateInstead >/dev/null
+  fi
+}
+
+git_add_all_commit() {
+  local message="${1}"
+  local dir="${2:-$(pwd)}"
+
+  assert_git_repo "${dir}"
+
+  git --work-tree="${dir}" --git-dir="${dir}/.git" add -A
+  git --work-tree="${dir}" --git-dir="${dir}/.git" commit -m "${message}" >/dev/null
+  commit=$(git --work-tree="${dir}" --git-dir="${dir}/.git" rev-parse HEAD)
+  echo "${commit}"
+}
+
+
+prepare_global_gitconfig() {
+  git config --global init.defaultBranch >/dev/null || git config --global init.defaultBranch "main"
+}
+
+prepare_global_gitignore() {
+  filename="${HOME}/.gitignore"
+  filename_backup="${filename}".bak
+
+  if git config --global --list | grep -q core.excludesfile; then
+    git config --global core.excludesfile >/tmp/git_config_global_exclude
+  fi
+
+  [ -f "${filename}" ] && cp "${filename}" "${filename_backup}"
+
+  cat <<EOT >"${filename}"
+##
+## Temporary files generated by various OSs and IDEs
+##
+Thumbs.db
+._*
+.DS_Store
+.idea
+.idea/*
+*.sublime*
+.project
+.netbeans
+.vscode
+.vscode/*
+nbproject
+nbproject/*
+EOT
+
+  git config --global core.excludesfile "${filename}"
+}
+
+restore_global_gitignore() {
+  filename=${HOME}/.gitignore
+  filename_backup="${filename}".bak
+  [ -f "${filename_backup}" ] && cp "${filename_backup}" "${filename}"
+  [ -f "/tmp/git_config_global_exclude" ] && git config --global core.excludesfile "$(cat /tmp/git_config_global_exclude)"
+}
diff --git a/.drevops/tests/bats/docs.bats b/.drevops/docs/.utils/tests/bats/docs.bats
similarity index 86%
rename from .drevops/tests/bats/docs.bats
rename to .drevops/docs/.utils/tests/bats/docs.bats
index a009d9155..110389e15 100644
--- a/.drevops/tests/bats/docs.bats
+++ b/.drevops/docs/.utils/tests/bats/docs.bats
@@ -2,10 +2,12 @@
 #
 # Test for docs publishing functionality.
 #
-# shellcheck disable=SC2030,SC2031,SC2129
+# shellcheck disable=SC2030,SC2031,SC2129,SC2002
 
 load _helper.bash
 
+export BATS_FIXTURE_EXPORT_CODEBASE_ENABLED=1
+
 @test "Docs release" {
   update_local_repo
 
@@ -23,7 +25,7 @@ load _helper.bash
   # The very first version is set as latest.
   assert_version "feature-test-branch-first" 1
 
-  substep "Test 2: Followup publish from \"feature-test-branch-second\" branch."
+  substep 'Test 2: Followup publish from "feature-test-branch-second" branch.'
   export DOCS_PUBLISH_SRC_BRANCH="feature/test-branch-second"
   run ./.utils/publish.sh
   assert_success
@@ -32,7 +34,7 @@ load _helper.bash
   assert_version "feature-test-branch-first" 1
   assert_version "feature-test-branch-second"
 
-  substep "Test 3: Followup publish from \"1.0.0\" tag."
+  substep 'Test 3: Followup publish from "1.0.0" tag.'
   export DOCS_PUBLISH_SRC_BRANCH="main"
   export DOCS_PUBLISH_SRC_TAG="1.0.0"
   run ./.utils/publish.sh
@@ -41,7 +43,7 @@ load _helper.bash
   assert_version "feature-test-branch-second"
   assert_version "1.0.0" 1
 
-  substep "Test 4: Followup publish from \"1.1.0\" tag."
+  substep 'Test 4: Followup publish from "1.1.0" tag.'
   export DOCS_PUBLISH_SRC_BRANCH="main"
   export DOCS_PUBLISH_SRC_TAG="1.1.0"
   run ./.utils/publish.sh
@@ -51,7 +53,7 @@ load _helper.bash
   assert_version "1.0.0"
   assert_version "1.1.0" 1
 
-  substep "Test 5: Followup publish from \"main\" branch."
+  substep 'Test 5: Followup publish from "main" branch.'
   export DOCS_PUBLISH_SRC_BRANCH="main"
   export DOCS_PUBLISH_CANARY_BRANCH="main"
   export DOCS_PUBLISH_SRC_TAG=""
@@ -75,10 +77,10 @@ assert_version() {
   assert_file_exists "${REMOTE_REPO_DIR}/CNAME"
   assert_file_exists "${REMOTE_REPO_DIR}/versions.json"
 
-  actual_has_version="$(cat "${REMOTE_REPO_DIR}/versions.json" | jq 'any(.[]; .version == "'${expected_version}'")')"
+  actual_has_version="$(cat "${REMOTE_REPO_DIR}/versions.json" | jq 'any(.[]; .version == "'"${expected_version}"'")')"
   assert_equal "true" "${actual_has_version}"
 
-  actual_has_alias="$(cat "${REMOTE_REPO_DIR}/versions.json" | jq 'any(.[]; .version == "'${expected_version}'" and any(.aliases[]?; . == "latest"))')"
+  actual_has_alias="$(cat "${REMOTE_REPO_DIR}/versions.json" | jq 'any(.[]; .version == "'"${expected_version}"'" and any(.aliases[]?; . == "latest"))')"
   if [ "${expected_has_alias}" -eq 1 ]; then
     assert_equal "true" "${actual_has_alias}"
   else
diff --git a/.drevops/docs/.utils/tests/package-lock.json b/.drevops/docs/.utils/tests/package-lock.json
new file mode 100644
index 000000000..d5a1f2d77
--- /dev/null
+++ b/.drevops/docs/.utils/tests/package-lock.json
@@ -0,0 +1,52 @@
+{
+    "name": "drevops-tests",
+    "version": "1.0.0",
+    "lockfileVersion": 2,
+    "requires": true,
+    "packages": {
+        "": {
+            "name": "drevops-tests",
+            "version": "1.0.0",
+            "license": "GPL-2.0-or-later",
+            "devDependencies": {
+                "bats-helpers": "npm:@drevops/bats-helpers@^1.3.1"
+            }
+        },
+        "node_modules/bats": {
+            "version": "1.10.0",
+            "resolved": "https://registry.npmjs.org/bats/-/bats-1.10.0.tgz",
+            "integrity": "sha512-yOQrC7npuCrN+Ic3TyjTjJlzHa0qlK3oEO6VAYPWwFeutx/GmpljIyB6uNSl/UTASyc2w4FgVuA/QMMf9OdsCw==",
+            "dev": true,
+            "bin": {
+                "bats": "bin/bats"
+            }
+        },
+        "node_modules/bats-helpers": {
+            "name": "@drevops/bats-helpers",
+            "version": "1.3.1",
+            "resolved": "https://registry.npmjs.org/@drevops/bats-helpers/-/bats-helpers-1.3.1.tgz",
+            "integrity": "sha512-CeKDILw3+o1W+L3EzMEo5E1is5UMc+tCbjMYJT+NE42cjNhH5l2+HTWksX5nc8unhmqysTOTn7zkp79LJLoX8w==",
+            "dev": true,
+            "dependencies": {
+                "bats": "^1"
+            }
+        }
+    },
+    "dependencies": {
+        "bats": {
+            "version": "1.10.0",
+            "resolved": "https://registry.npmjs.org/bats/-/bats-1.10.0.tgz",
+            "integrity": "sha512-yOQrC7npuCrN+Ic3TyjTjJlzHa0qlK3oEO6VAYPWwFeutx/GmpljIyB6uNSl/UTASyc2w4FgVuA/QMMf9OdsCw==",
+            "dev": true
+        },
+        "bats-helpers": {
+            "version": "npm:@drevops/bats-helpers@1.3.1",
+            "resolved": "https://registry.npmjs.org/@drevops/bats-helpers/-/bats-helpers-1.3.1.tgz",
+            "integrity": "sha512-CeKDILw3+o1W+L3EzMEo5E1is5UMc+tCbjMYJT+NE42cjNhH5l2+HTWksX5nc8unhmqysTOTn7zkp79LJLoX8w==",
+            "dev": true,
+            "requires": {
+                "bats": "^1"
+            }
+        }
+    }
+}
diff --git a/.drevops/docs/.utils/tests/package.json b/.drevops/docs/.utils/tests/package.json
new file mode 100644
index 000000000..3892a005d
--- /dev/null
+++ b/.drevops/docs/.utils/tests/package.json
@@ -0,0 +1,9 @@
+{
+    "name": "drevops-tests",
+    "version": "1.0.0",
+    "description": "Packages used for testing of DrevOps",
+    "license": "GPL-2.0-or-later",
+    "devDependencies": {
+        "bats-helpers": "npm:@drevops/bats-helpers@^1.3.1"
+    }
+}
diff --git a/.drevops/tests/lint.spelling.sh b/.drevops/tests/lint.spelling.sh
index 6903bc0ae..4520e2674 100755
--- a/.drevops/tests/lint.spelling.sh
+++ b/.drevops/tests/lint.spelling.sh
@@ -20,7 +20,6 @@ done < <(
   find \
     "${ROOT_DIR}"/.circleci \
     "${ROOT_DIR}"/.docker \
-    "${ROOT_DIR}"/docs \
     "${ROOT_DIR}"/hooks/library \
     "${ROOT_DIR}"/scripts \
     "${ROOT_DIR}"/patches \
@@ -53,7 +52,7 @@ for file in "${targets[@]}"; do
       # Remove HTML.
       sed -E 's/<([^<]+)>//g' |
       # Remove code blocks.
-      sed -n '/\`\`\`/,/\`\`\`/ !p' |
+      sed '/^[[:space:]]*```/,/^[[:space:]]*```/d' |
       # Remove inline code.
       sed -n '/\`/,/\`/ !p' |
       # Remove anchors.
diff --git a/.drevops/tests/test.common.sh b/.drevops/tests/test.common.sh
index 7ed51df69..7a48b4500 100755
--- a/.drevops/tests/test.common.sh
+++ b/.drevops/tests/test.common.sh
@@ -48,4 +48,3 @@ bats "${TEST_DIR}/bats/install.integrations.bats"
 bats "${TEST_DIR}/bats/install.demo.bats"
 bats "${TEST_DIR}/bats/reset.bats"
 bats "${TEST_DIR}/bats/update-drevops.bats"
-bats "${TEST_DIR}/bats/docs.bats"
diff --git a/.github/workflows/drevops-test-docs.yml b/.github/workflows/drevops-test-docs.yml
index 8c39e194b..2be30584c 100644
--- a/.github/workflows/drevops-test-docs.yml
+++ b/.github/workflows/drevops-test-docs.yml
@@ -12,18 +12,27 @@ jobs:
   drevops-test-docs:
     runs-on: ubuntu-latest
 
+    env:
+      DREVOPS_DEV_TEST_COVERAGE_DIR: /tmp/.drevops-coverage-html
+
     steps:
       - name: Checkout code
         uses: actions/checkout@v4
         with:
           persist-credentials: false
 
+      - name: Adjust git config to allow running git-related tests
+        run: git config --global safe.directory '*'
+
       - name: Install Ahoy
         run: os=$(uname -s | tr [:upper:] [:lower:]) && architecture=$(case $(uname -m) in x86_64 | amd64) echo "amd64" ;; aarch64 | arm64 | armv8) echo "arm64" ;; *) echo "amd64" ;; esac) && sudo wget -q https://github.com/ahoy-cli/ahoy/releases/latest/download/ahoy-bin-$os-$architecture -O /usr/local/bin/ahoy && sudo chown $USER /usr/local/bin/ahoy && chmod +x /usr/local/bin/ahoy
 
       - name: Install Aspell
         run: sudo apt-get update -y && sudo apt-get install -y aspell
 
+      - name: Install Kcov
+        run: wget https://github.com/SimonKagstrom/kcov/releases/download/v42/kcov-amd64.tar.gz && tar -xf kcov-amd64.tar.gz && sudo mv ./usr/local/bin/kcov /usr/local/bin/kcov && kcov --version
+
       - name: Setup PHP
         uses: shivammathur/setup-php@v2
 
@@ -37,4 +46,21 @@ jobs:
 
       - name: Run tests
         working-directory: .drevops/docs
-        run: ahoy test
+        run: ahoy test-site
+
+      - name: Run tests
+        run: ./docs/.utils/test.sh
+        working-directory: .drevops
+
+      - name: Upload coverage report as an artifact
+        uses: actions/upload-artifact@v4
+        with:
+          name: ${{github.job}}-code-coverage-report
+          path: /tmp/.drevops-coverage-html
+
+      - name: Upload coverage report to Codecov
+        uses: codecov/codecov-action@v4
+        with:
+          directory: /tmp/.drevops-coverage-html
+          fail_ci_if_error: true
+          token: ${{ secrets.CODECOV_TOKEN }}