Replace npm test with a proper bash script

The npm test script was dirty and had the unneeded side effect of generating an
output file. This change moves the test to a real bash script that runs the
appropriate tests and also additional checks when ran from Travis CI during a PR
build.

package.json

@@ -11,7 +11,7 @@
   "scripts": {
     "lint-markdown": "markdownlint pages*/**/*.md",
     "lint-tldr": "tldr-lint ./pages",
-    "test": "bash -c 'markdownlint pages*/**/*.md && tldr-lint ./pages 2>&1 | tee test_result; test ${PIPESTATUS[0]} -eq 0'",
+    "test": "bash scripts/test.sh",
     "build-index": "node ./scripts/build-index.js | tee pages/index.json > index.json"
   },
   "husky": {

scripts/test.sh

@@ -0,0 +1,54 @@
+#!/usr/bin/env bash
+
+# This script is executed by Travis CI for every successful push (on any branch, PR or not).
+# It runs some basic tests on pages. If the build is also a PR, additional
+# checks are run through the check-pr script, and any message or error is sent
+# to tldr-bot to be commented on the PR.
+#
+# NOTE: must be run from the repository root directory to correctly work!
+# NOTE: `set -e` is applied conditionally only if needed.
+
+# Default test.
+function default_test {
+  markdownlint pages*/**/*.md
+  tldr-lint ./pages
+}
+
+# Special test for Travis CI pull request builds.
+# Runs default_test collecting errors for tldr-bot.
+function pr_test {
+  errs=`default_test 2>&1`
+
+  if [ -n "$errs" ]; then
+    echo -e "Test failed!\n$errs\n" >&2
+    echo 'Sending errors to tldr-bot.' >&2
+    echo -n "$errs" | python3 scripts/send_to_bot.py error
+    exit 1
+  fi
+}
+
+# Additional checks for Travis CI pull request builds.
+# Only taken as suggestions, does not make the build fail.
+function pr_check {
+  msgs=`bash scripts/check-pr.sh`
+
+  if [ -n "$msgs" ]; then
+    echo -e "\nCheck PR reported the following message(s):\n$msgs\n" >&2
+    echo 'Sending check results to tldr-bot.' >&2
+    echo -n "$msgs" | python3 scripts/send_to_bot.py check
+  fi
+}
+
+###################################
+# MAIN
+###################################
+
+if [ "$TRAVIS" = "true" ] && [ "$TRAVIS_REPO_SLUG" = "tldr-pages/tldr" ] && [ "$TRAVIS_PULL_REQUEST" != "false" ]; then
+  pr_check
+  pr_test
+else
+  set -e
+  default_test
+fi
+
+echo 'Test ran succesfully!'