diff --git a/.ci/unit_test b/.ci/unit_test
index 49aaf79b7..00cbfc6f5 100755
--- a/.ci/unit_test
+++ b/.ci/unit_test
@@ -28,31 +28,73 @@ test_with_coverage() {
   local output_dir=test/output
   local coverprofile_file=coverprofile.out
   mkdir -p "${output_dir}"
+
   ginkgo "${GINKGO_COMMON_FLAGS[@]}" -gcflags=all=-d=checkptr=0 --coverprofile "${coverprofile_file}" -covermode=set -outputdir "${output_dir}" ${TEST_PACKAGES}
   sed -i='' '/mode: set/d' "${output_dir}/${coverprofile_file}"
   { echo "mode: set"; cat "${output_dir}/${coverprofile_file}"; } > "${output_dir}/${coverprofile_file}.temp"
   mv "${output_dir}/${coverprofile_file}.temp" "${output_dir}/${coverprofile_file}"
+
   go tool cover -func "${output_dir}/${coverprofile_file}"
 }
 
 ################################################################################
 
 # To run a specific package, run TEST_PACKAGES=<PATH_TO_PACKAGE> make test
-TEST_PACKAGES="${TEST_PACKAGES:-"cmd pkg"}"
+# If the TEST_PACKAGES is not set, then define a list of packages to run.
+TEST_PACKAGES="${TEST_PACKAGES:-"
+./pkg/backoff \
+./pkg/compactor \
+./pkg/defragmentor \
+./pkg/health/... \
+./pkg/initializer/... \
+./pkg/leaderelection \
+./pkg/member \
+./pkg/metrics \
+./pkg/miscellaneous \
+./pkg/server \
+./pkg/snapshot/... \
+./pkg/snapstore"
+}"
+
 
 RUN_NEGATIVE="${RUN_NEGATIVE:-"true"}"
 
 GINKGO_COMMON_FLAGS="-r -timeout=1h0m0s --show-node-events --fail-on-pending -mod=vendor"
 
+# First run the `pkg/defragmentor` tests to fail fast as it has flaky tests.
+# TODO: Remove this once the flaky tests are fixed.
+FIRST_PACKAGE_TO_RUN="./pkg/defragmentor"
+
+# Check if the FIRST_PACKAGE_TO_RUN is part of the TEST_PACKAGES
+IS_FIRST_PACKAGE_PRESENT=false
+if [[ " ${TEST_PACKAGES} " == *" ${FIRST_PACKAGE_TO_RUN} "* ]]; then
+  IS_FIRST_PACKAGE_PRESENT=true
+  # Remove FIRST_PACKAGE_TO_RUN from TEST_PACKAGES
+  TEST_PACKAGES=$(echo "${TEST_PACKAGES}" | sed "s|${FIRST_PACKAGE_TO_RUN}||")
+fi
+
 if [[ "${COVER:-false}" == "false" ]]; then
   echo "[INFO] Test coverage is disabled."
 
-  # Run all non-negative scenarios with randomize-all parameters.
+  # If the FIRST_PACKAGE_TO_RUN is present, run non-negative tests on it first.
+  if [[ "${IS_FIRST_PACKAGE_PRESENT}" == "true" ]]; then
+    echo "[INFO] Running tests for the first package: ${FIRST_PACKAGE_TO_RUN}"
+    ginkgo -race -trace $GINKGO_COMMON_FLAGS -gcflags=all=-d=checkptr=0 --randomize-all --skip="NEGATIVE\:.*" ${FIRST_PACKAGE_TO_RUN}
+  fi
+
+  # Run the non-negative scenarios for remaining packages with randomize-all parameters.
   ginkgo -race -trace $GINKGO_COMMON_FLAGS -gcflags=all=-d=checkptr=0 --randomize-all --randomize-suites --skip="NEGATIVE\:.*" $TEST_PACKAGES
 
   if [[ "${RUN_NEGATIVE}" == "true" ]]; then
     echo "[INFO] Running negative tests now..."
-    # Run negative scenarios sequentially (removed failOnPending as one spec in restore test is marked as 'X' for excluding)
+
+    # If the FIRST_PACKAGE_TO_RUN is present, run negative tests on it first.
+    if [[ "${IS_FIRST_PACKAGE_PRESENT}" == "true" ]]; then
+      echo "[INFO] Running negative tests for the first package: ${FIRST_PACKAGE_TO_RUN}"
+      ginkgo -race -trace $GINKGO_COMMON_FLAGS -gcflags=all=-d=checkptr=0 --focus="NEGATIVE\:.*" ${FIRST_PACKAGE_TO_RUN}
+    fi
+
+    # Run negative scenarios sequentially for remaining packages (removed failOnPending as one spec in restore test is marked as 'X' for excluding)
     ginkgo -race -trace $GINKGO_COMMON_FLAGS -gcflags=all=-d=checkptr=0 --focus="NEGATIVE\:.*" ${TEST_PACKAGES}
   fi