[Refactor] extract “get default packages” logic to nvm_get_default_packages

test/installation_node/default-packages

@@ -0,0 +1,115 @@
+#!/bin/sh
+
+FILE="$NVM_DIR/default-packages"
+
+die () { echo "$@" ; cleanup ; exit 1; }
+setup () {
+  if [ -f $FILE ]; then
+    ORIG_DEFAULT_PACKAGES=$(cat $FILE)
+    mkdir ./tmp/ ||:
+    mv $FILE ./tmp/default-packages ||:
+  fi
+  touch $FILE
+}
+cleanup () {
+  rm -rf "$(nvm_version_path v6.10.1)" $FILE
+  if [ "$ORIG_DEFAULT_PACKAGES" != "" ]; then
+    rm -rf ./tmp/
+    echo "$ORIG_DEFAULT_PACKAGES" > $FILE
+  fi
+}
+
+setup
+
+\. ../../nvm.sh
+
+cat > $FILE << EOF
+rimraf
+object-inspect@1.0.2
+
+# commented-package
+
+stevemao/left-pad
+EOF
+
+nvm install v6.10.1 2>&1
+EXIT_CODE=$?
+[ "_$EXIT_CODE" = "_0" ] || die "expected 'nvm install v6.10.1' to exit with 0, got $EXIT_CODE"
+
+nvm exec v6.10.1 npm ls -g --depth=0 | grep -q 'rimraf'
+if [ -z "$?" ]; then
+  die "expected 'nvm exec v6.10.1 npm ls -g --depth=0 | grep -q 'rimraf'' to exit with 0, got $?"
+fi
+
+cleanup
+
+setup
+
+\. ../../nvm.sh
+
+cat > $FILE << EOF
+rimraf
+object-inspect@1.0.2
+
+# commented-package
+
+stevemao/left-pad
+EOF
+
+nvm install v6.10.1 --skip-default-packages 2>&1
+EXIT_CODE=$?
+[ "_$EXIT_CODE" = "_0" ] || die "expected 'nvm install v6.10.1' to exit with 0, got $EXIT_CODE"
+
+if nvm exec v6.10.1 npm ls -g --depth=0 | grep -q 'rimraf'; then
+  die "expected 'nvm exec v6.10.1 npm ls -g --depth=0 | grep -q 'rimraf'' to be empty"
+fi
+
+cleanup
+
+setup
+
+cat > $FILE << EOF
+not~a~package~name
+EOF
+
+nvm install v6.10.1
+EXIT_CODE=$?
+[ "_$EXIT_CODE" = "_0" ] || die "expected 'nvm install v6.10.1' to exit with 0, got $EXIT_CODE"
+
+if nvm exec v6.10.1 npm ls -g --depth=0 | grep -q 'not~a~package~name'; then
+  die "expected 'nvm exec v6.10.1 npm ls -g --depth=0 | grep -q 'not~a~package~name'' to exit with 1, got $?"
+fi
+
+cleanup
+
+setup
+
+cat > $FILE << EOF
+object-inspect @ 1.0.2
+EOF
+
+nvm install v6.10.1 2>&1
+EXIT_CODE=$?
+[ "_$EXIT_CODE" = "_1" ] || die "expected 'nvm install v6.10.1' to exit with 1, got $EXIT_CODE"
+
+if nvm exec v6.10.1 npm ls -g --depth=0 | grep -q 'object-inspect'; then
+  die "expected 'nvm exec v6.10.1 npm ls -g --depth=0 | grep -q 'object-inspect'' to exit with 1, got $?"
+fi
+
+cleanup
+
+setup
+
+rm -rf $FILE
+
+nvm install v6.10.1 2>&1
+EXIT_CODE=$?
+[ "_$EXIT_CODE" = "_0" ] || die "expected 'nvm install v6.10.1' to exit with 0, got $EXIT_CODE"
+
+if nvm exec v6.10.1 npm ls -g --depth=0 | grep -q 'object-inspect'; then
+  die "expected 'nvm exec v6.10.1 npm ls -g --depth=0 | grep -q 'object-inspect'' to exit with 1, got $?"
+fi
+
+touch $FILE
+
+cleanup