/*
    * Copyright (C) 2006 The Guava Authors
    *
    * Licensed under the Apache License, Version 2.0 (the "License");
    * you may not use this file except in compliance with the License.
    * You may obtain a copy of the License at
    *
    * http://www.apache.org/licenses/LICENSE-2.0
    *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  
  package com.google.common.base;
  
  import com.google.common.annotations.GwtCompatible;
  
  import junit.framework.AssertionFailedError;
  import junit.framework.TestCase;
  
  /**
   * Unit test for {@link Preconditions}.
   *
   * @author Kevin Bourrillion
   * @author Jared Levy
   */
  @GwtCompatible(emulated = true)
  public class PreconditionsTest extends TestCase {
    public void testCheckArgument_simple_success() {
      Preconditions.checkArgument(true);
    }
  
    public void testCheckArgument_simple_failure() {
      try {
        Preconditions.checkArgument(false);
        fail("no exception thrown");
      } catch (IllegalArgumentException expected) {
      }
    }
  
    public void testCheckArgument_simpleMessage_success() {
      Preconditions.checkArgument(true, IGNORE_ME);
    }
  
    public void testCheckArgument_simpleMessage_failure() {
      try {
        Preconditions.checkArgument(false, new Message());
        fail("no exception thrown");
      } catch (IllegalArgumentException expected) {
        verifySimpleMessage(expected);
      }
    }
  
    public void testCheckArgument_nullMessage_failure() {
      try {
        Preconditions.checkArgument(false, null);
        fail("no exception thrown");
      } catch (IllegalArgumentException expected) {
        assertEquals("null", expected.getMessage());
      }
    }
  
    public void testCheckArgument_complexMessage_success() {
      Preconditions.checkArgument(true, "%s", IGNORE_ME);
    }
  
    public void testCheckArgument_complexMessage_failure() {
      try {
        Preconditions.checkArgument(false, FORMAT, 5);
        fail("no exception thrown");
      } catch (IllegalArgumentException expected) {
        verifyComplexMessage(expected);
      }
    }
  
    public void testCheckState_simple_success() {
      Preconditions.checkState(true);
    }
  
    public void testCheckState_simple_failure() {
      try {
        Preconditions.checkState(false);
        fail("no exception thrown");
      } catch (IllegalStateException expected) {
      }
    }
  
    public void testCheckState_simpleMessage_success() {
      Preconditions.checkState(true, IGNORE_ME);
    }
  
    public void testCheckState_simpleMessage_failure() {
      try {
        Preconditions.checkState(false, new Message());
        fail("no exception thrown");
      } catch (IllegalStateException expected) {
       verifySimpleMessage(expected);
     }
   }
 
   public void testCheckState_nullMessage_failure() {
     try {
       Preconditions.checkState(false, null);
       fail("no exception thrown");
     } catch (IllegalStateException expected) {
       assertEquals("null", expected.getMessage());
     }
   }
 
   public void testCheckState_complexMessage_success() {
     Preconditions.checkState(true, "%s", IGNORE_ME);
   }
 
   public void testCheckState_complexMessage_failure() {
     try {
       Preconditions.checkState(false, FORMAT, 5);
       fail("no exception thrown");
     } catch (IllegalStateException expected) {
       verifyComplexMessage(expected);
     }
   }
 
   private static final String NON_NULL_STRING = "foo";
 
   public void testCheckNotNull_simple_success() {
     String result = Preconditions.checkNotNull(NON_NULL_STRING);
     assertSame(NON_NULL_STRING, result);
   }
 
   public void testCheckNotNull_simple_failure() {
     try {
       Preconditions.checkNotNull(null);
       fail("no exception thrown");
     } catch (NullPointerException expected) {
     }
   }
 
   public void testCheckNotNull_simpleMessage_success() {
     String result = Preconditions.checkNotNull(NON_NULL_STRING, IGNORE_ME);
     assertSame(NON_NULL_STRING, result);
   }
 
   public void testCheckNotNull_simpleMessage_failure() {
     try {
       Preconditions.checkNotNull(null, new Message());
       fail("no exception thrown");
     } catch (NullPointerException expected) {
       verifySimpleMessage(expected);
     }
   }
 
   public void testCheckNotNull_complexMessage_success() {
     String result = Preconditions.checkNotNull(
         NON_NULL_STRING, "%s", IGNORE_ME);
     assertSame(NON_NULL_STRING, result);
   }
 
   public void testCheckNotNull_complexMessage_failure() {
     try {
       Preconditions.checkNotNull(null, FORMAT, 5);
       fail("no exception thrown");
     } catch (NullPointerException expected) {
       verifyComplexMessage(expected);
     }
   }
 
   public void testCheckElementIndex_ok() {
     assertEquals(0, Preconditions.checkElementIndex(0, 1));
     assertEquals(0, Preconditions.checkElementIndex(0, 2));
     assertEquals(1, Preconditions.checkElementIndex(1, 2));
   }
 
   public void testCheckElementIndex_badSize() {
     try {
       Preconditions.checkElementIndex(1, -1);
       fail();
     } catch (IllegalArgumentException expected) {
       // don't care what the message text is, as this is an invalid usage of
       // the Preconditions class, unlike all the other exceptions it throws
     }
   }
 
   public void testCheckElementIndex_negative() {
     try {
       Preconditions.checkElementIndex(-1, 1);
       fail();
     } catch (IndexOutOfBoundsException expected) {
       assertEquals("index (-1) must not be negative", expected.getMessage());
     }
   }
 
   public void testCheckElementIndex_tooHigh() {
     try {
       Preconditions.checkElementIndex(1, 1);
       fail();
     } catch (IndexOutOfBoundsException expected) {
       assertEquals("index (1) must be less than size (1)",
           expected.getMessage());
     }
   }
 
   public void testCheckElementIndex_withDesc_negative() {
     try {
       Preconditions.checkElementIndex(-1, 1, "foo");
       fail();
     } catch (IndexOutOfBoundsException expected) {
       assertEquals("foo (-1) must not be negative", expected.getMessage());
     }
   }
 
   public void testCheckElementIndex_withDesc_tooHigh() {
     try {
       Preconditions.checkElementIndex(1, 1, "foo");
       fail();
     } catch (IndexOutOfBoundsException expected) {
       assertEquals("foo (1) must be less than size (1)",
           expected.getMessage());
     }
   }
 
   public void testCheckPositionIndex_ok() {
     assertEquals(0, Preconditions.checkPositionIndex(0, 0));
     assertEquals(0, Preconditions.checkPositionIndex(0, 1));
     assertEquals(1, Preconditions.checkPositionIndex(1, 1));
   }
 
   public void testCheckPositionIndex_badSize() {
     try {
       Preconditions.checkPositionIndex(1, -1);
       fail();
     } catch (IllegalArgumentException expected) {
       // don't care what the message text is, as this is an invalid usage of
       // the Preconditions class, unlike all the other exceptions it throws
     }
   }
 
   public void testCheckPositionIndex_negative() {
     try {
       Preconditions.checkPositionIndex(-1, 1);
       fail();
     } catch (IndexOutOfBoundsException expected) {
       assertEquals("index (-1) must not be negative", expected.getMessage());
     }
   }
 
   public void testCheckPositionIndex_tooHigh() {
     try {
       Preconditions.checkPositionIndex(2, 1);
       fail();
     } catch (IndexOutOfBoundsException expected) {
       assertEquals("index (2) must not be greater than size (1)",
           expected.getMessage());
     }
   }
 
   public void testCheckPositionIndex_withDesc_negative() {
     try {
       Preconditions.checkPositionIndex(-1, 1, "foo");
       fail();
     } catch (IndexOutOfBoundsException expected) {
       assertEquals("foo (-1) must not be negative", expected.getMessage());
     }
   }
 
   public void testCheckPositionIndex_withDesc_tooHigh() {
     try {
       Preconditions.checkPositionIndex(2, 1, "foo");
       fail();
     } catch (IndexOutOfBoundsException expected) {
       assertEquals("foo (2) must not be greater than size (1)",
           expected.getMessage());
     }
   }
 
   public void testCheckPositionIndexes_ok() {
     Preconditions.checkPositionIndexes(0, 0, 0);
     Preconditions.checkPositionIndexes(0, 0, 1);
     Preconditions.checkPositionIndexes(0, 1, 1);
     Preconditions.checkPositionIndexes(1, 1, 1);
   }
 
   public void testCheckPositionIndexes_badSize() {
     try {
       Preconditions.checkPositionIndexes(1, 1, -1);
       fail();
     } catch (IllegalArgumentException expected) {
     }
   }
 
   public void testCheckPositionIndex_startNegative() {
     try {
       Preconditions.checkPositionIndexes(-1, 1, 1);
       fail();
     } catch (IndexOutOfBoundsException expected) {
       assertEquals("start index (-1) must not be negative",
           expected.getMessage());
     }
   }
 
   public void testCheckPositionIndexes_endTooHigh() {
     try {
       Preconditions.checkPositionIndexes(0, 2, 1);
       fail();
     } catch (IndexOutOfBoundsException expected) {
       assertEquals("end index (2) must not be greater than size (1)",
           expected.getMessage());
     }
   }
 
   public void testCheckPositionIndexes_reversed() {
     try {
       Preconditions.checkPositionIndexes(1, 0, 1);
       fail();
     } catch (IndexOutOfBoundsException expected) {
       assertEquals("end index (0) must not be less than start index (1)",
           expected.getMessage());
     }
   }
 
   public void testFormat() {
     assertEquals("%s", Preconditions.format("%s"));
     assertEquals("5", Preconditions.format("%s", 5));
     assertEquals("foo [5]", Preconditions.format("foo", 5));
     assertEquals("foo [5, 6, 7]", Preconditions.format("foo", 5, 6, 7));
     assertEquals("%s 1 2", Preconditions.format("%s %s %s", "%s", 1, 2));
     assertEquals(" [5, 6]", Preconditions.format("", 5, 6));
     assertEquals("123", Preconditions.format("%s%s%s", 1, 2, 3));
     assertEquals("1%s%s", Preconditions.format("%s%s%s", 1));
     assertEquals("5 + 6 = 11", Preconditions.format("%s + 6 = 11", 5));
     assertEquals("5 + 6 = 11", Preconditions.format("5 + %s = 11", 6));
     assertEquals("5 + 6 = 11", Preconditions.format("5 + 6 = %s", 11));
     assertEquals("5 + 6 = 11", Preconditions.format("%s + %s = %s", 5, 6, 11));
     assertEquals("null [null, null]",
         Preconditions.format("%s", null, null, null));
     assertEquals("null [5, 6]", Preconditions.format(null, 5, 6));
   }
 
   private static final Object IGNORE_ME = new Object() {
     @Override public String toString() {
       throw new AssertionFailedError();
     }
   };
 
   private static class Message {
     boolean invoked;
     @Override public String toString() {
       assertFalse(invoked);
       invoked = true;
       return "A message";
     }
   }
 
   private static final String FORMAT = "I ate %s pies.";
 
   private static void verifySimpleMessage(Exception e) {
     assertEquals("A message", e.getMessage());
   }
 
   private static void verifyComplexMessage(Exception e) {
     assertEquals("I ate 5 pies.", e.getMessage());
   }
 }