feat(tests): add install-npm tests

scripts/install/netlify-cli.sh

@@ -1,2 +1,3 @@
 #!/bin/bash
 npm install -g netlify-cli
+echo "Netlify CLI installed successfully."

scripts/install/npm.sh

@@ -1,2 +1,3 @@
 #!/bin/bash
 npm install -g npm
+echo "npm installed successfully."

tests/install-npm.bats

@@ -0,0 +1,19 @@
+#!./tests/bats/bin/bats
+
+setup() {
+    load 'libraries/bats-support/load'
+    load 'libraries/bats-assert/load'
+    source ./tests/mocks.sh
+}
+
+@test "Install npm" {
+    run ./scripts/install/npm.sh
+    assert_output --partial "$INSTALL_NPM"
+    refute_output --partial "ERR!"
+}
+
+@test "Install Netlify CLI" {
+    run ./scripts/install/netlify-cli.sh
+    assert_output --partial "$INSTALL_NETLIFY_CLI"
+    refute_output --partial "ERR!"
+}