diff --git a/.workflows/bats/Dockerfile b/.workflows/bats/Dockerfile
index afbcef3..77e8616 100644
--- a/.workflows/bats/Dockerfile
+++ b/.workflows/bats/Dockerfile
@@ -1,15 +1,60 @@
 ARG bashversion=3.2.57
+FROM alpine:3.12.0 as git
+RUN apk add --no-cache \
+        zlib-dev \
+        openssl-dev \
+        curl-dev \
+        curl \
+        expat-dev \
+        perl-dev \
+        python3-dev \
+        pcre2-dev \
+        asciidoc \
+        xmlto \
+        perl-error \
+        tcl \
+        tk \
+        make \
+        gcc \
+        g++
+WORKDIR /src
+ARG gitversion=2.26.2
+RUN curl --output git-${gitversion}.tar.gz \
+         https://mirrors.edge.kernel.org/pub/software/scm/git/git-${gitversion}.tar.gz && \
+    tar -xvzf git-${gitversion}.tar.gz
+RUN export TO=/git && \
+    mkdir -p ${TO} && \
+    cd git-${gitversion} && \
+    make prefix=/usr DESTDIR=${TO} NO_GETTEXT=YesPlease NO_REGEX=YesPlease ICONV_OMITS_BOM=Yes && \
+    make prefix=/usr DESTDIR=${TO} NO_GETTEXT=YesPlease NO_REGEX=YesPlease ICONV_OMITS_BOM=Yes strip && \
+    make prefix=/usr DESTDIR=${TO} NO_GETTEXT=YesPlease NO_REGEX=YesPlease ICONV_OMITS_BOM=Yes install && \
+    # remove files that aren't part of standard package
+    rm /git/usr/libexec/git-core/git-cvs* && \
+    rm /git/usr/libexec/git-core/git-daemon && \
+    rm /git/usr/libexec/git-core/git-fast-import && \
+    rm /git/usr/libexec/git-core/git-http-backend && \
+    rm /git/usr/libexec/git-core/git-instaweb && \
+    rm /git/usr/libexec/git-core/git-remote-testsvn && \
+    rm /git/usr/libexec/git-core/git-shell && \
+    rm /git/usr/libexec/git-core/git-svn && \
+    rm /git/usr/libexec/git-core/*p4* && \
+    rm /git/usr/libexec/git-core/mergetools/*p4* && \
+    rm /git/usr/libexec/git-core/*email* && \
+    rm /git/usr/libexec/git-core/*imap*
+
 FROM bash:${bashversion}
+ARG batsversion=v1.2.0
 LABEL maintainer="Dmytro Serdiuk <dmytro.serdiuk@gmail.com>" \
-      description="The image serves the environment for the testing of Elegant Git."
-VOLUME /elegant-git
+      description="The image serves the environment for the testing of Elegant Git." \
+      bashversion=${bashversion} \
+      gitversion=${gitversion} \
+      batsversion=${batsversion}
 WORKDIR /elegant-git
+VOLUME /elegant-git
 ENV EG_ENABLE_TESTING true
-ARG gitversion=2.26.2
-RUN apk add --no-cache git~=${gitversion}
-ARG batsversion=v1.2.0
-RUN git clone --branch ${batsversion} --single-branch --depth 1 https://github.com/bats-core/bats-core.git; \
+COPY --from=git /git/usr/ /usr/
+RUN apk add --no-cache curl-dev && \
+    git clone --branch ${batsversion} --single-branch --depth 1 https://github.com/bats-core/bats-core.git && \
     cd bats-core && ./install.sh /usr/local && cd - && rm -r bats-core
-COPY bats-workflows.bash /bats-workflows.bash
-ENTRYPOINT [ "/bats-workflows.bash" ]
+ENTRYPOINT [ ".workflows/bats/bats-workflows.bash" ]
 CMD ["help"]
diff --git a/.workflows/bats/bats-workflows.bash b/.workflows/bats/bats-workflows.bash
index 8380d09..fae619f 100755
--- a/.workflows/bats/bats-workflows.bash
+++ b/.workflows/bats/bats-workflows.bash
@@ -25,7 +25,6 @@ MESSAGE
 
 main() {
     case ${1} in
-        all_tests)  all_tests ;;
         some_tests) shift; some_tests "${@}" ;;
         help)       usage ;;
         *)          "${@}" ;;
diff --git a/.workflows/docs/Dockerfile b/.workflows/docs/Dockerfile
index 623d799..601334b 100644
--- a/.workflows/docs/Dockerfile
+++ b/.workflows/docs/Dockerfile
@@ -1,16 +1,15 @@
-ARG pythonversion=3.8.3
-FROM python:${pythonversion}-alpine
+FROM python:3.8.3-alpine
 LABEL maintainer="Dmytro Serdiuk <dmytro.serdiuk@gmail.com>" \
       description="The image serves the environment for docs development of Elegant Git."
+ARG bashversion=5.0.17
+ARG gitversion=2.26.2
+RUN apk add --no-cache bash=~${bashversion} git=~${gitversion}
 VOLUME /elegant-git
 WORKDIR /elegant-git
 ENV EG_ENABLE_TESTING true
 EXPOSE 80
-ENTRYPOINT [ "/docs-workflows.bash" ]
+ENTRYPOINT [ ".workflows/docs/docs-workflows.bash" ]
 CMD ["help"]
 COPY docs/requirements.txt .
-RUN python -m pip install --upgrade pip && \
-    python -m pip install -r requirements.txt
-ARG bashversion=5.0.17
-RUN apk add --no-cache bash~=${bashversion}
-COPY .workflows/docs/docs-workflows.bash /
+RUN python -m pip install --no-cache-dir --upgrade pip && \
+    python -m pip install --no-cache-dir -r requirements.txt
diff --git a/.workflows/docs/docs-workflows.bash b/.workflows/docs/docs-workflows.bash
index 0ddca5f..70d2292 100755
--- a/.workflows/docs/docs-workflows.bash
+++ b/.workflows/docs/docs-workflows.bash
@@ -2,7 +2,7 @@
 set -e
 
 generate() {
-    exec python .workflows/docs/docs.py
+    python .workflows/docs/docs.py
 }
 
 build() {
@@ -10,14 +10,20 @@ build() {
     if test -z "${EG_ENABLE_TESTING}"; then
         site_directory=$(pwd)/elegnat-git-docs
     fi
-    exec python -m mkdocs build --clean --strict --site-dir ${site_directory}
+    python -m mkdocs build --clean --strict --site-dir ${site_directory}
 }
 
 preview() {
     exec python -m mkdocs serve --dev-addr 0.0.0.0:80
 }
 
-help() {
+check() {
+    echo "Checking if there are uncommitted docs files ..."
+    git update-index --really-refresh
+    git diff-index --quiet HEAD docs
+}
+
+usage() {
 cat <<MESSAGE
 usage: ${BASH_SOURCE[0]} <command>
 
@@ -26,8 +32,17 @@ Available commands:
     generate        generates fresh commands documentation
     build           builds the static documentation site
     preview         previews the documentation site
+    check           shows whether 'docs' directory is committed or not
 
 MESSAGE
 }
 
-${1}
+main() {
+    case ${1} in
+        help)  usage ;;
+        ci)    generate && check ;;
+        *)     "${@}" ;;
+    esac
+}
+
+main "${@}"
diff --git a/docs/index.md b/docs/index.md
index b186c10..edaa31a 100644
--- a/docs/index.md
+++ b/docs/index.md
@@ -21,6 +21,18 @@ picture-in-picture" allowfullscreen></iframe></center>
 > _Looks interesting? Go to [getting started](getting-started.md) guide or take a look for
 available [commands](commands.md)._
 
+Elegant Git has a rich test suit that executes on several Git and Bash versions. Please refer to
+the table below to see the coverage matrix.
+
+`bash --version`|`git --version`|`git elegant --version`
+---|---|---
+5.0.17|2.26.2|up to the latest
+4.4.23|2.26.2|up to the latest
+3.2.57|2.26.2|up to the latest
+5.0.17|2.13.7|up to the latest
+4.4.23|2.13.7|up to the latest
+3.2.57|2.13.7|up to the latest
+
 # Workflows
 While developing something, it may be required to format code prior to committing modifications or
 to open several URLs to report release notes after a new release. All these and similar actions,
diff --git a/workflows b/workflows
index 25187c4..f6fa44b 100755
--- a/workflows
+++ b/workflows
@@ -3,43 +3,49 @@ set -e
 
 source ./libexec/plugins/text
 
-bash_3_2_57=3.2.57
+# bash versions
+bash_3_2_57=3.2.57 # MACOS default
+bash_4_4_23=4.4.23
 bash_5_0_17=5.0.17
+# python versions
 python_3_8_3=3.8.3
+# git versions
+git_2_13_7=2.13.7
 git_2_26_2=2.26.2
-bashes=(
-    ${bash_5_0_17}
-    ${bash_3_2_57}
-)
-gits=(
-    ${git_2_26_2}
-)
-base_testing_worker=bash${bash_3_2_57}-git${git_2_26_2}
+
+--worker-tag() {
+    # usege: --worker-tag <bash version> <git version>
+    echo ${1}-${2}
+}
 
 eg_docker_organization=beeshive
-eg_documents_repository=${eg_docker_organization}/elegant-git-docs-workflows
-eg_documents_image=${eg_documents_repository}:python${python_3_8_3}-bash${bash_5_0_17}
+eg_documents_repository=${eg_docker_organization}/elegant-git-docs-worker
+eg_documents_bash=${bash_5_0_17}
+eg_documents_git=${git_2_26_2}
+eg_documents_image=${eg_documents_repository}:$(--worker-tag ${eg_documents_bash} ${eg_documents_git})
 eg_bats_repository=${eg_docker_organization}/elegant-git-bats-worker
-eg_bats_image=${eg_bats_repository}:${base_testing_worker}
-
+bats_worker_tags=(
+    $(--worker-tag ${bash_3_2_57} ${git_2_13_7})
+    $(--worker-tag ${bash_4_4_23} ${git_2_13_7})
+    $(--worker-tag ${bash_5_0_17} ${git_2_13_7})
+    $(--worker-tag ${bash_3_2_57} ${git_2_26_2})
+    $(--worker-tag ${bash_4_4_23} ${git_2_26_2})
+    $(--worker-tag ${bash_5_0_17} ${git_2_26_2})
+)
 
 --publish-worker() {
     info-text "Select image to push:"
-    select tag in $(docker image ls --filter reference=${1} --format "{{.Repository}}:{{.Tag}}"); do
+    select tag in $(docker image ls --filter reference=${1} --format "{{.Repository}}:{{.Tag}}") exit; do
+        if test ${tag} = "exit"; then break; fi
         docker push ${tag}
-        break
     done
 }
 
 # docs workflows
 prepare-docs-worker() {
-    local bashversion=${bash_5_0_17}
-    local pythonversion=${python_3_8_3}
     docker build --tag ${eg_documents_image} \
-                 --label bashversion=${bashversion} \
-                 --label pythonversion=${pythonversion} \
-                 --build-arg bashversion=${bashversion} \
-                 --build-arg pythonversion=${pythonversion} \
+                 --build-arg bashversion=${eg_documents_bash} \
+                 --build-arg gitversion=${eg_documents_git} \
                  --file .workflows/docs/Dockerfile .
 }
 
@@ -68,100 +74,130 @@ serve-docs() {
 # docs workflows
 
 repository() {
-    info-text "Start container..."
-    docker run --interactive --tty --detach --rm \
-               --name repository \
-               --workdir /tmp/elegant-git-repo \
-               --mount type=bind,source=$(pwd),target=/elegant-git \
-               ${eg_bats_image} bash
-    info-text "Init repository..."
-    docker exec --interactive --tty repository bash -c "
-        cd /elegant-git
-        source tests/addons-repo.bash
-        source tests/addons-common.bash
-        repo-new
-    "
-    info-text "Install Elegant Git..."
-    docker exec --interactive --tty repository bash -c "
-        cd /elegant-git
-        .workflows/installation-workflows.bash install
-    "
-    info-text "Ready! Enjoy experiments..."
-    docker attach repository
+    info-text "Select worker:"
+    select worker in ${bats_worker_tags[*]} exit; do
+        if test ${worker} = "exit"; then break; fi
+        info-text "Start container..."
+        docker run --interactive --tty --detach --rm \
+                --name repository \
+                --workdir /tmp/elegant-git-repo \
+                --mount type=bind,source=$(pwd),target=/elegant-git \
+                ${eg_bats_repository}:${worker} bash
+        info-text "Init repository..."
+        docker exec --interactive --tty repository bash -c "
+            cd /elegant-git
+            source tests/addons-repo.bash
+            source tests/addons-common.bash
+            repo-new
+        "
+        info-text "Install Elegant Git..."
+        docker exec --interactive --tty repository bash -c "
+            cd /elegant-git
+            .workflows/installation-workflows.bash install
+        "
+        info-text "Ready! Enjoy experiments..."
+        docker attach repository
+    done
 }
 
 # testing workflows
 prepare-bats-worker() {
-    info-text "Select Bash and Git version:"
-    select bashv in ${bashes[*]}; do
-        bashversion=${bashv}
-        break
-    done
-    select gitv in ${gits[*]}; do
-        gitversion=${gitv}
-        break
-    done
     local batsversion=v1.2.0
-    docker build --tag ${eg_bats_repository}:bash${bashversion}-git${gitversion} \
-                 --label bashversion=${bashversion} \
-                 --label gitversion=${gitversion} \
-                 --label batsversion=${batsversion} \
-                 --build-arg bashversion=${bashversion} \
-                 --build-arg gitversion=${gitversion} \
-                 --build-arg batsversion=${batsversion} \
-                 .workflows/bats
+    info-text "Select worker:"
+    select worker in ${bats_worker_tags[*]} exit; do
+        if test ${worker} = "exit"; then break; fi
+        docker build --tag ${eg_bats_repository}:${worker} \
+                     --build-arg bashversion=${worker%%-*} \
+                     --build-arg gitversion=${worker##*-} \
+                     --build-arg batsversion=${batsversion} \
+                     .workflows/bats
+    done
 }
 
 publish-bats-worker() {
     --publish-worker ${eg_bats_repository}
 }
 
-testing() {
-    echo $@
-    docker run --interactive --rm  \
-               --mount type=bind,source=$(pwd),target=/elegant-git \
-               ${eg_bats_image} some_tests "$@"
+--bats-workers() {
+    # usage: --bats-workers <task-name> [<args> ...]
+    local task=${1}; shift
+    for tag in ${bats_worker_tags[*]}; do
+        docker run --detach \
+                   --mount type=bind,source=$(pwd),target=/elegant-git \
+                   --name elegant-git-${task}-${tag} \
+                   ${eg_bats_repository}:${tag} "${@}"
+    done
 }
 
-__fail() {
-    error-box $@
-    exit 1
+testing() {
+    --bats-workers some-bats some_tests "$@"
+    --report-containerized-jobs
 }
 
 test-commands-docs() {
-    (
-        generate-docs
-        git update-index --really-refresh
-        git diff-index --quiet HEAD docs
-    ) || __fail "'docs/commands.md' is not up to date. Please run './workflows generate-docs' and commit the changes."
+    docker run --detach \
+               --mount type=bind,source=$(pwd),target=/elegant-git \
+               --name elegant-git-test-commands-docs \
+               ${eg_documents_image} ci
 }
 
 test-docs-site() {
-    {
-        docker run --interactive --rm \
-                   --mount type=bind,source=$(pwd),target=/elegant-git \
-                ${eg_documents_image} build
-    } || __fail "Unable to build the documentation site."
+    docker run --detach \
+               --name elegant-git-test-docs-site \
+               --mount type=bind,source=$(pwd),target=/elegant-git \
+               ${eg_documents_image} build
 }
 
 test-installation() {
-    (
-        docker run --interactive --rm \
-               --mount type=bind,source=$(pwd),target=/elegant-git \
-               ${eg_bats_image} bash -c "
+    --bats-workers installation bash -c "
                .workflows/installation-workflows.bash install
                .workflows/installation-workflows.bash smoke-tests
         "
-    ) || __fail "Installation test is failed."
 }
 
 ci() {
-    docker run --interactive --rm \
-               --mount type=bind,source=$(pwd),target=/elegant-git \
-               ${eg_bats_image} all_tests
+    --bats-workers all-bats all_tests
     test-commands-docs
     test-docs-site
     test-installation
+    --report-containerized-jobs
+}
+
+--report-containerized-jobs() {
+    info-box "Waiting for containerized jobs are completed ..."
+    while test -n "$(docker container ls --filter name=elegant-git --format {{.Names}})"; do
+        local containers=($(docker container ls --filter name=elegant-git --format {{.Names}}))
+        info-text "${#containers[*]} jobs still working ..."
+        sleep 3
+    done
+    info-box "Reporting job statuses ..."
+    local passes=($(docker container ls --all --filter exited=0 --format {{.Names}}))
+    for passed in ${passes[*]} ; do
+        info-text "${passed} job is passed."
+    done
+    if test ${#passes[*]} -ne 0 ; then
+        info-text "Remove containers for passed jobs ..."
+        docker container rm -f ${passes[*]}
+    fi
+    local failures=($(docker container ls --all --filter name=elegant-git --format {{.Names}}))
+    for failed in ${failures[*]} ; do
+        error-text "${failed} job is failed."
+        docker logs ${failed}
+    done
+    if test ${#failures[*]} -ne 0 ; then
+        info-text "Remove containers for failed jobs ..."
+        docker container rm -f ${failures[*]}
+    fi
+    if test ${#failures[*]} -ne 0; then
+        error-box "${#passes[*]} jobs are passed and ${#failures[*]} are failed."
+        error-text "Failed jobs:"
+        for fail in ${failures[*]}; do
+            error-text "- ${fail}"
+        done
+        exit 1
+    else
+        info-box "${#passes[*]} jobs are passed."
+    fi
 }
 
 robot() {
@@ -172,6 +208,7 @@ robot() {
     for command_file in ${command_files[@]}; do
         local command_name=$(basename ${command_file})
         if ! test -f tests/${command_name}.bats; then continue; fi
+        info-box "Run tests for ${command_file}"
         ( testing ${command_name} && info-text "'${command_file}' testing is passed." ) || {
             error-text "'${command_name}' testing is failed."
             smart_testing_status=failed
@@ -184,6 +221,7 @@ robot() {
             continue # already tested
         fi
         if ! test -f tests/${file_name}; then continue; fi
+        info-box "Run tests in ${file_name}"
         ( testing ${file_name} && info-text "'${file_name}' testing is passed.") || {
             error-text "'${file_name}' testing is failed."
             smart_testing_status=failed
@@ -210,8 +248,8 @@ Available commands:
     preview-docs         runs a site with the current documentation (http://localhost)
     serve-docs           runs 'generate-docs' and 'preview-docs'
   testing modifications
-    prepare-bats-worker  builds a new '${eg_bats_image}' image
-    publish-bats-worker  pushes the '${eg_bats_image}' image
+    prepare-bats-worker  builds a new '${eg_bats_repository}' image
+    publish-bats-worker  pushes the '${eg_bats_repository}' image
     testing              runs bats tests; accepts a optional pattern for tests
                          filtering ("${BASH_SOURCE[0]} testing work" run all tests
                          which have the word in the test name)
@@ -250,8 +288,9 @@ main() {
     if [[ -z ${command} ]]; then
         question-text "Please select a command:"
         echo ""
-        select any in ${commands[@]}; do
-            command=${any}
+        select choise in ${commands[@]} exit; do
+            if test ${choise} = "exit"; then exit; fi
+            command=${choise}
             if test ${command} = testing; then
                 question-text "Please give the tests pattern: "
                 read args
@@ -263,6 +302,9 @@ main() {
     fi
     info-box "Run:" ${command} ${args:-${@}}
     ${command} ${args:-${@}}
+    if [[ ${command} =~ "test-" ]]; then
+        --report-containerized-jobs
+    fi
 }
 
 main ${@}