src/test/java/net/pterodactylus/util/envopt/SystemEnvironmentTest.java

   1 package net.pterodactylus.util.envopt;
   2
   3 import java.util.Map;
   4 import java.util.Map.Entry;
   5 import java.util.Optional;
   6
   7 import org.hamcrest.MatcherAssert;
   8 import org.hamcrest.Matchers;
   9 import org.junit.Test;
  10
  11 /**
  12  * Unit test for {@link SystemEnvironment}.
  13  *
  14  * @author <a href="mailto:bombe@pterodactylus.net">David ‘Bombe’ Roden</a>
  15  */
  16 public class SystemEnvironmentTest {
  17
  18         private final SystemEnvironment environment = new SystemEnvironment();
  19
  20         @Test
  21         public void accessorCanAccessTheSystemEnvironment() {
  22                 Map<String, String> systemEnvironment = System.getenv();
  23                 MatcherAssert.assertThat(systemEnvironment.entrySet(), Matchers.not(Matchers.empty()));
  24                 for (Entry<String, String> environmentEntry : systemEnvironment.entrySet()) {
  25                         MatcherAssert.assertThat(environment.getValue(environmentEntry.getKey()), Matchers.is(
  26                                         Optional.of(environmentEntry.getValue())));
  27                 }
  28         }
  29
  30         @Test
  31         public void accessorRecognizesNonExistingVariables() {
  32                 String randomName = generateRandomName();
  33                 MatcherAssert.assertThat(environment.getValue(randomName), Matchers.is(Optional.empty()));
  34         }
  35
  36         private String generateRandomName() {
  37                 StringBuilder stringBuilder = new StringBuilder();
  38                 do {
  39                         stringBuilder.setLength(0);
  40                         for (int i = 0; i < 10; i++) {
  41                                 stringBuilder.append((char) ('A' + (Math.random() * 26)));
  42                         }
  43                 } while (System.getenv(stringBuilder.toString()) != null);
  44                 return stringBuilder.toString();
  45         }
  46
  47 }