[Tests] nvm exec/nvm run: add --silent tests

Co-authored-by: Atsushi Yamamoto <[email protected]>
Co-authored-by: Jordan Harband <[email protected]>

Author: jumbosushi

test/slow/nvm exec/Preamble works and respects 'silent' flag renamed to test/slow/nvm exec/Running 'nvm exec --silent' should work

@@ -0,0 +1,29 @@
+#!/bin/sh
+
+set -ex
+
+die () { echo "$@" ; exit 1; }
+
+. ../../../nvm.sh
+
+echo "0.10.7" > .nvmrc
+
+# Check nvm run without --silent
+OUTPUT="$(nvm run --version)"
+EXPECTED_OUTPUT="
+Found '${PWD}/.nvmrc' with version <0.10.7>
+Running node v0.10.7 (npm v1.2.17)
+v0.10.7"
+[ "${OUTPUT}" = "${EXPECTED_OUTPUT}" ] \
+  || die "\`nvm run\` failed to run; did not match with the .nvmrc version; got >${OUTPUT}<"
+
+OUTPUT="$(nvm run --silent --version)"
+EXPECTED_OUTPUT="v0.10.7"
+[ "${OUTPUT}" = "${EXPECTED_OUTPUT}" ] \
+  || die "\`nvm run --silent\` failed to run silently; expected no output, got >${OUTPUT}<"
+
+# Output shouldn't be silent if --silent flag is not at the third argument position
+OUTPUT="$(nvm run --version --silent)"
+EXPECTED_OUTPUT=""
+[ "${OUTPUT}" != "${EXPECTED_OUTPUT}" ] \
+  || die "\`nvm run --version --silent\` should not be silent; expected >${OUTPUT}<, got no output"