Unit Testing Angular Material 2 dialogs - unit-testing

Question

While writing unit tests for a function that handles a angular material 2 dialog using the example code from material 2 i run into problems.
I'm a Jasmine newbie but I didn't had problems to write unit test before.
I have to test the result of the afterClose function but i can't get the handle to dialogRef.
Could it be a problem how the material2 dialog API is engineered?
let dialogRef = this.dialog.open(ExtractPageDialog, {
width: this.EXPORT_DIALOG_WIDTH,
data: {
document: this.document
}
});
dialogRef.afterClosed().subscribe((result: any) => {
if (result) {
let fileId = this.document.fileId;
this.docProvider.extractPage(this.document.fileId, result.fromPage, result.toPage).subscribe(() => {
() => { //totest },
(error) => { //totest }
});
} else {
//totest
}
});
DOCS:
https://material.angular.io/components/component/dialog

Answer 1

one solution could be to split the subscribed function in multiple functions and test them
dialogRef.afterClosed().subscribe(this.functionName);
functionName(result: any) {
if (result) {
let fileId = this.document.fileId;
this.docProvider.extractPage(this.document.fileId, result.fromPage, result.toPage).subscribe(() => {
() => { //totest },
(error) => { //totest }
});
} else {
//totest
}
}
}