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                class DMSJsonFieldTest extends SapphireTest  | 
            
                            
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                { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    public function testJsonFieldConstructorMultiWays()  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $jsonField = new DMSJsonField('MyJsonField', new FieldList( | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            new TextField('FirstName', 'Given name'), | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            new TextField('Surname', 'Last name') | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        ));  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $this->assertEquals($jsonField->FieldList()->count(), 2);  | 
            
                            
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                        $this->assertNotNull($jsonField->FieldList()->dataFieldByName('MyJsonField[FirstName]')); | 
            
                            
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                        $jsonField = new DMSJsonField('MyJsonField', array(new TextField('FirstName', 'Given name'), | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            new TextField('Surname', 'Last name'))); | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $this->assertEquals($jsonField->FieldList()->count(), 2);  | 
            
                            
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                        $this->assertNotNull($jsonField->FieldList()->dataFieldByName('MyJsonField[FirstName]')); | 
            
                            
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                        $jsonField = new DMSJsonField(  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            'MyJsonField',  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            new TextField('FirstName', 'Given name'), | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            new TextField('Surname', 'Last name') | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        );  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $this->assertEquals($jsonField->FieldList()->count(), 2);  | 
            
                            
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                        $this->assertNotNull($jsonField->FieldList()->dataFieldByName('MyJsonField[FirstName]')); | 
            
                            
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                    }  | 
            
            
                                                                        
                            
            
                                    
            
            
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                    public function testJsonFieldDataValueCouldDealWithArray()  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $jsonField = new DMSJsonField('MyJsonField', new FieldList( | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            new TextField('FirstName', 'Given name'), | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            new TextField('Surname', 'Last name') | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        ));  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $jsonField->setValue($value = array(  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            'MyJsonField'=>array(  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                'FirstName' => 'Normann',  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                'Surname' => 'Lou',  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            ),  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        ));  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $this->assertEquals($jsonField->dataValue(), Convert::array2json($value));  | 
            
                            
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                        $jsonField->setValue($value = array(  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            'MyJsonField'=>array(),  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        ));  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $this->assertNull($jsonField->dataValue());  | 
            
                            
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                    }  | 
            
            
                                                        
            
                                    
            
            
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                }  | 
            
            
                                                        
            
                                    
            
            
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You can fix this by adding a namespace to your class:
When choosing a vendor namespace, try to pick something that is not too generic to avoid conflicts with other libraries.