Enhancement: Require phpunit/phpunit and add basic Travis configuration

.travis.yml

@@ -0,0 +1,32 @@
+language: php
+
+sudo: false
+
+php:
+  - 7.1
+  - 7.2
+  - master
+
+env:
+  matrix:
+    - DEPENDENCIES="high"
+    - DEPENDENCIES="low"
+  global:
+    - DEFAULT_COMPOSER_FLAGS="--no-interaction --no-ansi --no-progress --no-suggest"
+
+before_install:
+  - composer self-update
+  - composer clear-cache
+
+install:
+  - if [[ "$DEPENDENCIES" = 'high' ]]; then travis_retry composer update $DEFAULT_COMPOSER_FLAGS; fi
+  - if [[ "$DEPENDENCIES" = 'low' ]]; then travis_retry composer update $DEFAULT_COMPOSER_FLAGS --prefer-lowest; fi
+
+script:
+  - ./vendor/bin/phpunit --coverage-clover=coverage.xml
+
+after_success:
+  - bash <(curl -s https://codecov.io/bash)
+
+notifications:
+  email: false

README.md

@@ -1,3 +1,5 @@
+[![Build Status](https://travis-ci.org/sebastianbergmann/php-file-iterator.svg?branch=master)](https://travis-ci.org/sebastianbergmann/php-file-iterator)
+
 # php-file-iterator
 
 ## Installation

composer.json

@@ -21,6 +21,9 @@
     "require": {
         "php": "^7.1"
     },
+    "require-dev": {
+        "phpunit/phpunit": "^7.1"
+    },
     "autoload": {
         "classmap": [
             "src/"
@@ -32,4 +35,3 @@
         }
     }
 }
-

phpunit.xml

@@ -0,0 +1,21 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<phpunit xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:noNamespaceSchemaLocation="https://schema.phpunit.de/7.2/phpunit.xsd"
+         bootstrap="vendor/autoload.php"
+         forceCoversAnnotation="true"
+         beStrictAboutCoversAnnotation="true"
+         beStrictAboutOutputDuringTests="true"
+         beStrictAboutTodoAnnotatedTests="true"
+         verbose="true">
+    <testsuites>
+        <testsuite name="default">
+            <directory suffix="Test.php">tests</directory>
+        </testsuite>
+    </testsuites>
+
+    <filter>
+        <whitelist processUncoveredFilesFromWhitelist="true">
+            <directory suffix=".php">src</directory>
+        </whitelist>
+    </filter>
+</phpunit>