Issue #29

I fix issue #29 (Invalid MIME type at purchase invoice documents) by
using the MIME type from Magic.getMagicMatch() instead of the MIME type
submitted by the browser.

Furthermore, I write the Spock specification for it.

application.properties

@@ -1,7 +1,7 @@
 #Grails Metadata file
-#Thu Jan 09 12:00:30 CET 2014
-app.buildDate=2014-01-09T12\:00\:30+0100
-app.buildNumber=5601
+#Thu Jan 09 14:57:48 CET 2014
+app.buildDate=2014-01-09T14\:57\:48+0100
+app.buildNumber=5631
 app.buildProfile=test
 app.grails.version=2.3.4.BUILD-SNAPSHOT
 app.name=GrailsUnitTestMixin

grails-app/domain/org/amcworld/springcrm/DataFile.groovy

@@ -39,7 +39,7 @@ class DataFile {
     static constraints = {
         fileName blank: false
         mimeType nullable: true
-        fileSize range: 0L..104857600L          // 0..100M
+        fileSize range: 0L..104_857_600L        // 0..100M
         dateCreated()
         lastUpdated()
     }
@@ -136,13 +136,13 @@ class DataFile {
         }
 
         this.fileName = file.originalFilename
-        this.mimeType = file.contentType ?: Magic.getMagicMatch(file.bytes).mimeType
+        this.mimeType = Magic.getMagicMatch(file.bytes).mimeType
         this.fileSize = file.size
     }
 
     @Override
     String toString() {
-        fileName
+        fileName ?: ''
     }
 }