Require tests for feature/bugfix

https://pulp.plan.io/issues/7437
closes #7437

.travis/pre_before_install.sh

@@ -0,0 +1,23 @@
+#!/usr/bin/env bash
+
+set -mveuo pipefail
+
+# skip this check for everything but PRs
+if [ "$TRAVIS_PULL_REQUEST" = "false" ]; then
+  exit 0
+fi
+
+if [ "$TRAVIS_COMMIT_RANGE" != "" ]; then
+  RANGE=$TRAVIS_COMMIT_RANGE
+elif [ "$TRAVIS_COMMIT" != "" ]; then
+  RANGE="$TRAVIS_COMMIT~...$TRAVIS_COMMIT"
+fi
+
+
+REQUIRES_TEST=$(git diff --name-only $RANGE | grep -E 'feature|bugfix')
+CONTAINS_TEST=$(git diff --name-only $RANGE | grep -E '^test_')
+
+if [ -n $REQUIRES_TEST ] && ![ -n $CONTAINS_TEST ]; then
+  echo "Test required for feature/bugfix."
+  exit 1
+fi

CHANGES/7437.feature

@@ -0,0 +1 @@
+Require tests for feature/bugfix