package com.atlassian.sal.api.features;
   
   import org.junit.Test;
   
   import static org.hamcrest.Matchers.is;
   import static org.junit.Assert.assertFalse;
   import static org.junit.Assert.assertThat;
   import static org.junit.Assert.assertTrue;
   
  public class TestValidFeatureKeyPredicate {
      @Test
      public void invalidNullKey() throws Exception {
          assertFalse(ValidFeatureKeyPredicate.isValidFeatureKey(null));
      }
  
      @Test
      public void invalidEmptyString() throws Exception {
          assertFalse(ValidFeatureKeyPredicate.isValidFeatureKey(""));
      }
  
      @Test
      public void invalidSpaces() throws Exception {
          assertFalse(ValidFeatureKeyPredicate.isValidFeatureKey(" "));
      }
  
      @Test
      public void invalidComma() throws Exception {
          assertFalse(ValidFeatureKeyPredicate.isValidFeatureKey(","));
      }
  
      @Test
      public void validWithDots() throws Exception {
          assertTrue(ValidFeatureKeyPredicate.isValidFeatureKey("com.atlassian.darkfeature.key"));
      }
  
      @Test
      public void validWithDash() throws Exception {
          assertTrue(ValidFeatureKeyPredicate.isValidFeatureKey("all-the-things"));
      }
  
      @Test
      public void validWithUnderscore() throws Exception {
          assertTrue(ValidFeatureKeyPredicate.isValidFeatureKey("go_go"));
      }
  
      @Test
      public void validWithNumbers() throws Exception {
          assertTrue(ValidFeatureKeyPredicate.isValidFeatureKey("v1"));
      }
  
      @Test
      public void checkValidFeatureKey() {
          final String featureKey = "valid.feature.key";
          final String result = ValidFeatureKeyPredicate.checkFeatureKey(featureKey);
          assertThat(result, is(featureKey));
      }
  
      @Test(expected = InvalidFeatureKeyException.class)
      public void checkInvalidFeatureKey() {
          ValidFeatureKeyPredicate.checkFeatureKey("  invalid   ");
      }
  }