diff --git a/plans/unit-tests.fmf b/plans/unit-tests.fmf
index 6b6e36e..be96033 100644
--- a/plans/unit-tests.fmf
+++ b/plans/unit-tests.fmf
@@ -7,6 +7,7 @@ prepare:
           - osbuild
 discover:
     how: fmf
+    dist-git-source: true
     filter: tag:unit-test
 execute:
     how: tmt
diff --git a/tests/unit-tests/prep-host-environment.sh b/tests/unit-tests/prep-host-environment.sh
index eb19934..7435e04 100755
--- a/tests/unit-tests/prep-host-environment.sh
+++ b/tests/unit-tests/prep-host-environment.sh
@@ -6,42 +6,12 @@ set -euxo pipefail
 
 source /etc/os-release
 
-case "${ID}" in
-    fedora)
-        PKG_MAINT_TOOL="fedpkg"
-        sudo dnf install -y "${PKG_MAINT_TOOL}"
-        ;;
-    rhel)
-        PKG_MAINT_TOOL="rhpkg"
-        # rhpkg is not available in the default repos
-        sudo curl -L -o "/etc/yum.repos.d/rcm-tools-rhel-${VERSION_ID%.*}-baseos.repo" "http://download.devel.redhat.com/rel-eng/internal/rcm-tools-rhel-${VERSION_ID%.*}-baseos.repo"
-        # install the RH IT CA certificate used by the repo above
-        sudo curl -L -o /etc/pki/ca-trust/source/anchors/2015-IT-Root-CA.pem http://certs.corp.redhat.com/certs/2015-IT-Root-CA.pem
-        sudo curl -L -o /etc/pki/ca-trust/source/anchors/2022-IT-Root-CA.pem http://certs.corp.redhat.com/certs/2022-IT-Root-CA.pem
-        sudo update-ca-trust
-        ;;
-    centos)
-        PKG_MAINT_TOOL="centpkg"
-        # centpkg is not available in the default repos
-        sudo dnf install -y epel-release
-        # CRB repos are available only for CentOS Stream 9
-        if [ "${VERSION_ID}" == "9" ]; then
-            dnf config-manager --set-enabled crb
-        fi
-        ;;
-    *)
-        echo "Error: unsupported OS: ${ID}-${VERSION_ID}"
-        exit 1
-        ;;
-esac
-
 # Move to the checked out git repo with the test plans
 # this should be the root of the dist-git repo
 cd "${TMT_TREE}"
 
 # install all test dependencies
 sudo dnf install -y \
-    "${PKG_MAINT_TOOL}" \
     rpmdevtools \
     python3-mako \
     python3-pip \
diff --git a/tests/unit-tests/run-unit-tests.sh b/tests/unit-tests/run-unit-tests.sh
index c04d7d6..3181add 100755
--- a/tests/unit-tests/run-unit-tests.sh
+++ b/tests/unit-tests/run-unit-tests.sh
@@ -13,68 +13,6 @@ if [ "$(uname -m)" != "x86_64" ]; then
     exit 0
 fi
 
-case "${ID}" in
-    fedora)
-        PKG_MAINT_TOOL="fedpkg"
-        ;;
-    rhel)
-        PKG_MAINT_TOOL="rhpkg"
-        ;;
-    centos)
-        PKG_MAINT_TOOL="centpkg"
-        ;;
-    *)
-        echo "Error: unsupported OS: ${ID}-${VERSION_ID}"
-        exit 1
-        ;;
-esac
-
-# Move to the checked out git repo with the test plans
-# this should be the root of the dist-git repo
-cd "${TMT_TREE}"
-# the content of the directory is copy of the dist-git repo, but the .git directory is missing
-# so we need to create it to make all *pkg tools happy
-git init
-
-# deduct the release to pass to rpkg to prep the sources.
-# 1. use the DIST_GIT_RELEASE if set
-DIST_GIT_RELEASE="${DIST_GIT_RELEASE:-}"
-# 2. use the TARGET_BRANCH if set
-if [[ -z "${DIST_GIT_RELEASE}" ]]; then
-    echo "DIST_GIT_RELEASE was not provided, trying to use TARGET_BRANCH"
-    DIST_GIT_RELEASE="${TARGET_BRANCH:-}"
-fi
-# 3. use the host OS type and version
-if [[ -z "${DIST_GIT_RELEASE}" ]]; then
-    echo "DIST_GIT_RELEASE nor TARGET_BRANCH were not provided, trying to use the host OS type and version"
-    case "${ID}" in
-        fedora)
-            DIST_GIT_RELEASE="f${VERSION_ID}"
-            ;;
-        rhel)
-            DIST_GIT_RELEASE="rhel-${VERSION_ID}.0"
-            ;;
-        centos)
-            DIST_GIT_RELEASE="c${VERSION_ID}s"
-            ;;
-    esac
-fi
-
-# The namespace and name must be passed explicitly to rhpkg, because it can't determine them on its own.
-# Passing these options to centpkg and fedpkg is harmless, so we can use them for all tools.
-# shellcheck disable=SC2086
-${PKG_MAINT_TOOL} -v --namespace rpms --name osbuild --release "${DIST_GIT_RELEASE}" prep
-
-# Extract the Source0 basename without extension
-SRC_DIR=$(spectool --source 0 osbuild.spec | sed -E 's|.*/([^/]*)\.tar\.gz$|\1|')
-
-cd "${SRC_DIR}"
-
-# Some unit tests depend on the fact that the source code is in a git repo
-git init .
-git add *
-git commit -m "Initial commit"
-
 # The 'test/run/test_assemblers.py::test_tar' test case uses system tar to extract the built tar archive.
 # However, files in the tar archive can have SELinux context not present in the system policy. Therefore,
 # in order for the system tar to be able to set it when extracting the archive, it must be labeled with
@@ -112,6 +50,15 @@ if ([ "${ID}" == "rhel" ] || [ "${ID}" == "centos" ]) && [ "${VERSION_ID%%.*}" =
     TEST_SELECTION_EXPR="${TEST_SELECTION_EXPR} and not (test_write_read)"
 fi
 
+# Move to the directory with sources
+cd "${TMT_SOURCE_DIR}"
+
+# Extract the Source0 basename without extension
+SRC_DIR=$(spectool --source 0 osbuild.spec | sed -E 's|.*/([^/]*)\.tar\.gz$|\1|')
+
+# Move to the extracted sources directory (patches are applied by default)
+cd "${SRC_DIR}"
+
 sudo python3 -m pytest \
     --rootdir "$(pwd)" \
     --ignore "$(pwd)/test/src" \