added tests and typedoc

src/app/shared/utils/file-value-accessor.directive.ts

@@ -13,6 +13,9 @@ import {NG_VALUE_ACCESSOR, ControlValueAccessor} from '@angular/forms';
         { provide: NG_VALUE_ACCESSOR, useExisting: FileValueAccessorDirective, multi: true }
     ]
 })
+/**
+ * Value accessor directive for inputs of type 'file'
+ */
 export class FileValueAccessorDirective implements ControlValueAccessor {
     value: any;
     onChange = (_) => { /* empty */ };

src/app/shared/utils/require-file.validator.ts

@@ -8,9 +8,12 @@ import {NG_VALIDATORS, Validator, FormControl} from '@angular/forms';
         { provide: NG_VALIDATORS, useExisting: FileValidator, multi: true },
     ]
 })
+/**
+ * Validator directive to validate if a file is selected
+ */
 export class FileValidator implements Validator {
     static validate(c: FormControl): {[key: string]: any} {
-      return c.value == null || c.value.length === 0 ? { required : true} : null;
+      return c.value == null || c.value.length === 0 ? { required : true } : null;
     }
 
     validate(c: FormControl): {[key: string]: any} {