gemfire-core/src/test/java/com/gemstone/gemfire/internal/lang/ClassUtilsJUnitTest.java

/*
 * =========================================================================
 *  Copyright (c) 2002-2014 Pivotal Software, Inc. All Rights Reserved.
 *  This product is protected by U.S. and international copyright
 *  and intellectual property laws. Pivotal products are covered by
 *  more patents listed at http://www.pivotal.io/patents.
 * =========================================================================
 */

package com.gemstone.gemfire.internal.lang;

import static org.junit.Assert.*;

import java.util.Calendar;
import java.util.Date;

import org.junit.Test;
import org.junit.experimental.categories.Category;

import com.gemstone.gemfire.test.junit.categories.UnitTest;

/**
 * The ClassUtilsJUnitTest class is a test suite with test cases to test the contract and functionality of the ClassUtils
 * class.
 * <p/>
 * @author John Blum
 * @see com.gemstone.gemfire.internal.lang.ClassUtils
 * @see org.junit.Assert
 * @see org.junit.Test
 * @since 7.0
 */
@Category(UnitTest.class)
public class ClassUtilsJUnitTest {

  @Test
  public void testForNameWithExistingClass() {
    assertEquals(Object.class, ClassUtils.forName("java.lang.Object", new RuntimeException("unexpected")));
  }

  @Test(expected = RuntimeException.class)
  public void testForNameWithNonExistingClass() {
    try {
      ClassUtils.forName("com.mycompany.non.existing.Class", new RuntimeException("expected"));
    }
    catch (RuntimeException expected) {
      assertEquals("expected", expected.getMessage());
      throw expected;
    }
  }

  @Test(expected = NullPointerException.class)
  public void testForNameWithNullClassName() {
    ClassUtils.forName(null, new IllegalArgumentException("Null Class!"));
  }

  @Test(expected = IllegalArgumentException.class)
  public void testForNameWithEmptyClassName() {
    try {
      ClassUtils.forName(StringUtils.EMPTY_STRING, new IllegalArgumentException("Empty Class Name!"));
    }
    catch (IllegalArgumentException expected) {
      assertEquals("Empty Class Name!", expected.getMessage());
      throw expected;
    }
  }

  @Test(expected = IllegalArgumentException.class)
  public void testForNameWithBlankClassName() {
    try {
      ClassUtils.forName("  ", new IllegalArgumentException("Blank Class Name!"));
    }
    catch (IllegalArgumentException expected) {
      assertEquals("Blank Class Name!", expected.getMessage());
      throw expected;
    }
  }

  @Test(expected = NullPointerException.class)
  public void testForNameThrowsNullPointerExceptionForNullRuntimeExceptionArgument() {
    ClassUtils.forName("com.mycompany.non.existing.Class", null);
  }

  @Test
  public void testGetClassWithNull() {
    assertNull(ClassUtils.getClass(null));
  }

  @Test
  public void testGetClassWithObject() {
    assertEquals(java.lang.String.class, ClassUtils.getClass("test"));
  }

  @Test
  public void testGetClassNameWithNull() {
    assertNull(ClassUtils.getClassName(null));
  }

  @Test
  public void testGetClassNameWithObject() {
    assertEquals(java.lang.String.class.getName(), ClassUtils.getClassName("null"));
  }

  @Test
  public void testIsClassAvailableWithExistingClass() {
    assertTrue(ClassUtils.isClassAvailable("java.lang.Object"));
  }

  @Test
  public void testIsClassAvailableWithNonExistingClass() {
    assertFalse(ClassUtils.isClassAvailable("com.mycompany.non.existing.Class"));
  }

  @Test
  public void testIsAnInstanceOf() {
    assertTrue(ClassUtils.isInstanceOf(Object.class, "null"));
    assertTrue(ClassUtils.isInstanceOf(String.class, "C"));
    assertTrue(ClassUtils.isInstanceOf(Number.class, Math.PI));
    assertTrue(ClassUtils.isInstanceOf(Number.class, 3.14f));
    assertTrue(ClassUtils.isInstanceOf(Number.class, 0l));
    assertTrue(ClassUtils.isInstanceOf(Number.class, 0));
    assertTrue(ClassUtils.isInstanceOf(Boolean.class, true));
    assertTrue(ClassUtils.isInstanceOf(Boolean.class, false));
  }

  @Test
  public void testIsNotAnInstanceOf() {
    assertFalse(ClassUtils.isInstanceOf(null, null));
    assertFalse(ClassUtils.isInstanceOf(null, new Object()));
    assertFalse(ClassUtils.isInstanceOf(Object.class, null));
    assertFalse(ClassUtils.isInstanceOf(String.class, 'C'));
    assertFalse(ClassUtils.isInstanceOf(Long.class, Math.PI));
    assertFalse(ClassUtils.isInstanceOf(Double.class, 3.14f));
    assertFalse(ClassUtils.isInstanceOf(Date.class, Calendar.getInstance()));
    assertFalse(ClassUtils.isInstanceOf(Boolean.class, 1));
    assertFalse(ClassUtils.isInstanceOf(Boolean.class, "false"));
  }

  @Test
  public void testIsNotInstanceOfWithNoTypes() {
    assertTrue(ClassUtils.isNotInstanceOf("test"));
  }

  @Test
  public void testIsNotInstanceOfWithMultipleTypes() {
    assertTrue(ClassUtils.isNotInstanceOf("test", Boolean.class, Character.class, Integer.class, Double.class));
  }

  @Test
  public void testIsNotInstanceOfWithMultipleNumberTypes() {
    assertFalse(ClassUtils.isNotInstanceOf(1, Double.class, Long.class, Number.class));
  }

  @Test
  public void testIsNotInstanceOfWithMultipleCompatibleTypes() {
    assertFalse(ClassUtils.isNotInstanceOf(1, Double.class, Float.class, Integer.class, Long.class, Number.class));
  }

}