Remove `aria2c` from PATH to use `curl` stub during test

test/build.bats

@@ -8,6 +8,7 @@ export CC=cc
 export -n RUBY_CONFIGURE_OPTS
 
 setup() {
+  ensure_not_found_in_path aria2c
   mkdir -p "$INSTALL_ROOT"
   stub md5 false
   stub aria2c false

test/cache.bats

@@ -6,6 +6,7 @@ export RUBY_BUILD_CACHE_PATH="$TMP/cache"
 export RUBY_BUILD_ARIA2_OPTS=
 
 setup() {
+  ensure_not_found_in_path aria2c
   mkdir "$RUBY_BUILD_CACHE_PATH"
 }
 

test/fetch.bats

@@ -5,6 +5,7 @@ export RUBY_BUILD_SKIP_MIRROR=1
 export RUBY_BUILD_CACHE_PATH=
 
 setup() {
+  ensure_not_found_in_path aria2c
   export RUBY_BUILD_BUILD_PATH="${TMP}/source"
   mkdir -p "${RUBY_BUILD_BUILD_PATH}"
 }

test/hooks.bats

@@ -3,6 +3,7 @@
 load test_helper
 
 setup() {
+  ensure_not_found_in_path aria2c
   export RBENV_ROOT="${TMP}/rbenv"
   export HOOK_PATH="${TMP}/i has hooks"
   mkdir -p "$HOOK_PATH"

test/rbenv.bats

@@ -4,6 +4,7 @@ load test_helper
 export RBENV_ROOT="${TMP}/rbenv"
 
 setup() {
+  ensure_not_found_in_path aria2c
   stub rbenv-hooks 'install : true'
   stub rbenv-rehash 'true'
 }

test/test_helper.bash

@@ -9,6 +9,39 @@ if [ "$FIXTURE_ROOT" != "$BATS_TEST_DIRNAME/fixtures" ]; then
   export PATH
 fi
 
+remove_command_from_path() {
+  OLDIFS="${IFS}"
+  local cmd="$1"
+  local path
+  local paths=()
+  IFS=:
+  for path in ${PATH}; do
+    if [ -e "${path}/${cmd}" ]; then
+      local tmp_path="$(mktemp -d "${TMP}/path.XXXXX")"
+      ln -fs "${path}"/* "${tmp_path}"
+      rm -f "${tmp_path}/${cmd}"
+      paths["${#paths[@]}"]="${tmp_path}"
+    else
+      paths["${#paths[@]}"]="${path}"
+    fi
+  done
+  export PATH="${paths[*]}"
+  IFS="${OLDIFS}"
+}
+
+ensure_not_found_in_path() {
+  local cmd
+  for cmd; do
+    if command -v "${cmd}" 1>/dev/null 2>&1; then
+      remove_command_from_path "${cmd}"
+    fi
+  done
+}
+
+setup() {
+  ensure_not_found_in_path aria2c
+}
+
 teardown() {
   rm -fr "${TMP:?}"/*
 }