Add test unit for required check

test/include/paranoid.test.js

+/* jshint camelcase: false */
+/* jshint expr: true */
+var chai      = require('chai')
+  , expect    = chai.expect
+  , Support   = require(__dirname + '/../support')
+  , DataTypes = require(__dirname + "/../../lib/data-types")
+  , datetime  = require('chai-datetime')
+
+chai.use(datetime)
+chai.config.includeStack = true
+
+describe(Support.getTestDialectTeaser("Paranoid"), function () {
+
+  beforeEach(function ( done ) {
+    var S = this.sequelize,
+        DT = DataTypes,
+
+        A = this.A = S.define( 'A', { name: DT.STRING }, { paranoid: true }),
+        B = this.B = S.define( 'B', { name: DT.STRING }, { paranoid: true }),
+        C = this.C = S.define( 'C', { name: DT.STRING }, { paranoid: true }),
+        D = this.D = S.define( 'D', { name: DT.STRING }, { paranoid: true })
+
+    A
+      .belongsTo( B )
+      .hasMany( D )
+      .hasMany( C )
+
+    B
+      .hasMany( A )
+      .hasMany( C )
+
+    C
+      .belongsTo( A )
+      .belongsTo( B )
+
+    D
+      .hasMany( A )
+
+    S.sync({ force: true }).done(function ( err ) {
+      expect( err ).not.to.be.ok
+      done()
+    })
+
+  })
+
+  it( 'test if default required behavior is marked as false', function ( done ) {
+
+    var A = this.A,
+        B = this.B,
+        options = {
+          include: [
+            {
+              model: B,
+            }
+          ],
+        }
+
+    A.find( options ).done(function ( err ) {
+      expect( err ).not.to.be.ok
+      expect( options.include[0].required ).to.be.equal( false )
+
+      done()
+    })
+
+  })
+
+  it( 'test if non required is marked as false', function ( done ) {
+
+    var A = this.A,
+        B = this.B,
+        options = {
+          include: [
+            {
+              model: B,
+              required: false,
+            }
+          ],
+        }
+
+    A.find( options ).done(function ( err ) {
+      expect( err ).not.to.be.ok
+      expect( options.include[0].required ).to.be.equal( false )
+
+      done()
+    })
+
+  })
+
+  it( 'test if required is marked as true', function ( done ) {
+
+    var A = this.A,
+        B = this.B,
+        options = {
+          include: [
+            {
+              model: B,
+              required: true,
+            }
+          ],
+        }
+
+    A.find( options ).done(function ( err ) {
+      expect( err ).not.to.be.ok
+      expect( options.include[0].required ).to.be.equal( true )
+
+      done()
+    })
+
+  })
+})
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