added tests and typedoc

src/app/process-page/new/process-parameters/parameter-value-input/value-input.component.ts

@@ -1,5 +1,11 @@
 import { EventEmitter, Output } from '@angular/core';
 
+/**
+ * Abstract class that represents value input components
+ */
 export abstract class ValueInputComponent<T> {
+  /**
+   * Used by the subclasses to emit the value when it's updated
+   */
   @Output() updateValue: EventEmitter<T> = new EventEmitter<T>()
 }