fix(dfm): update traps and tests (#124)

* fix(dfm): update traps and tests

* fix(dfm): initialize defaults and secure tests

* fix(tests): secure helper quoting and extend install coverage

* fix(utils): avoid double extension when resolving command

* fix(tests): quote paths and add strict mode

* fix(utils): escape function name in regex

tests/dfm/helpers.bash

@@ -0,0 +1,17 @@
+run_with_dfm() {
+  local cmd="$*"
+  run env \
+    PROJECT_ROOT="$PROJECT_ROOT" \
+    DFM_CMD_DIR="$PROJECT_ROOT/local/dfm/cmd" \
+    DFM_LIB_DIR="$PROJECT_ROOT/local/dfm/lib" \
+    DOTFILES="${DOTFILES:-$PROJECT_ROOT}" \
+    NO_AUTOMATION="${NO_AUTOMATION:-1}" \
+    TEMP_DIR="$TEMP_DIR" \
+    bash -c 'set -e
+      cmd="$1"
+      source "$PROJECT_ROOT/local/dfm/lib/common.sh"
+      source "$PROJECT_ROOT/local/dfm/lib/utils.sh"
+      set +e
+      eval "$cmd"' bash "$cmd"
+}
+