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Groovy example source code file (MultipleAssignmentDeclarationTest.groovy)

This example Groovy source code file (MultipleAssignmentDeclarationTest.groovy) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Groovy tags/keywords

compilabletestsupport, integer, integer, missingpropertyexception, missingpropertyexception, multipleassignmentdeclarationtest, multipleassignmentdeclarationtest, string, string

The Groovy MultipleAssignmentDeclarationTest.groovy source code

package gls.statements

import gls.CompilableTestSupport

class MultipleAssignmentDeclarationTest extends CompilableTestSupport {

  void testDef() {
    assertScript """
      def (a,b) = [1,2]
      assert a==1
      assert b==2
    """
  }
  
  void testDefWithoutLiteral() {
    def list = [1, 2]
    def (c, d) = list
    assert c==1
    assert d==2
  }
  
  void testMixedTypes() {
    assertScript """
      def x = "foo"
      def (int i, String j) = [1,x]
      assert x == "foo"
      assert i == 1
      assert i instanceof Integer
      assert j == "foo"
      assert j instanceof String
    """
  }
  
  void testMixedTypesWithConversion() {
    assertScript '''
      def x = "foo"
      def (int i, String j) = [1,"$x $x"]
      assert x == "foo"
      assert i == 1
      assert i instanceof Integer
      assert j == "foo foo"
      assert j instanceof String
    '''
  }
  
  void testDeclarationOrder() {
    assertScript """
      try {
        def (i,j) = [1,i]
        assert false
      } catch (MissingPropertyException mpe) {
        assert true
      }
    """
  }
  
  void testNestedScope() {
    assertScript """
       def c = {
         def (i,j) = [1,2]
         assert i==1
         assert j==2
       }
       c()
       
       try {
         println i
         assert false
       } catch (MissingPropertyException mpe) {
         assert true
       }
       
       try {
         println j
         assert false
       } catch (MissingPropertyException mpe) {
         assert true
       }
              
       def (i,j) = [2,3]
       assert i==2
       assert j==3
       c()
       
       assert i==2
       assert j==3
    """   
  }
}

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