Unable to unit test Actions having default arg values [141099045]

Fixed

Bug

Status Update

No update yet.

Description

[Deleted User]

created issue #1

Sep 16, 2019 05:32PM

Component used: Navigation
Version used: 2.0.0
Devices/Android versions reproduced on: during development; any IDE
SDK: Java

Summary:
I can't unit test any production code that tries navigating to an auto-generated Action class that has a default value. It seems (in version 2.0.0) that the default values are set by the NavController instead of baked into the auto-generated class. The result is that I get some NullPointerExceptions when trying to unit test navigation.

To reproduce:
1. In nav graph xml, add an argument having a default value to an action
<fragment
android:id="@id/screen1_fragment"
android:name="com.yourapp.yourpackage.Screen1Fragment"
<action
android:id="@+id/action_screen1_to_screen2"
app:destination="@id/screen2_fragment"
<argument
android:name="myBoolean"
app:argType="boolean"
android:defaultValue="false" />
</action>
</fragment>

2. In prod code, navigate using this action without overriding the default
NavController.navigate(Screen1FragmentDirections.actionScreen1ToScreen2());

3. In a unit test, try to verify that the screen1-to-screen2 navigation was invoked
verify(NavController).navigate(Screen1FragmentDirections.actionScreen1ToScreen2());

Expected: Unit test passes with flying colors

Actual: NullPointerException is thrown when the verify() does an equals() comparison. The auto-generated class does not contain default values, and so ActionScreen1ToScreen2.getMyBoolean() method attempts to cast a null value into a boolean, like so:

public boolean getMyBoolean() {
return (boolean) arguments.get("myBoolean");
}

Seems like a testability issue. If there's something I'm missing please let me know.

Related Issues (but not the same):
* SafeArg Builder classes doesn't contain the default values (

https://partnerissuetracker.corp.google.com/issues/140123727)

Comments

il...@google.com <il...@google.com> #2Sep 16, 2019 05:33PM

Hi. Thanks for reporting this. Fixed in this changelist. This should be available in alpha-04

[Deleted User] <[Deleted User]> #3Sep 16, 2019 06:25PM

Project: platform/frameworks/support
Branch: androidx-main

commit e782987543a9f8ccd485e970ddc74564b24378db
Author: Vighnesh Raut <vighnesh.raut13@gmail.com>
Date: Mon Jan 02 15:27:40 2023

fix: tab row crashes when only 1 tab is added

Bug:

b/264018028

Test: Added unit test

Change-Id: I6381dbac304fc1d69d3708c6655f8b595668e93f

M tv/tv-material/src/androidTest/java/androidx/tv/material/TabRowTest.kt
M tv/tv-material/src/main/java/androidx/tv/material/TabRow.kt

https://android-review.googlesource.com/2373449

[Deleted User] <[Deleted User]> #4Sep 16, 2019 06:34PM

deleted

il...@google.com <il...@google.com> #5Sep 16, 2019 07:40PM

Assigned to jb...@google.com.

The following release(s) address this bug.It is possible this bug has only been partially addressed:

androidx.tv:tv-material:1.0.0-alpha04

ap...@google.com <ap...@google.com> #6Oct 5, 2019 12:53AM

Project: platform/frameworks/support
Branch: androidx-master-dev

commit 2180ea57914af961d4f2bb43802b42ae0d1802e0
Author: Jeremy Woods <jbwoods@google.com>
Date: Fri Oct 04 16:02:03 2019

Generate default values for Directions safe_args in Java

Currently the safe args generation for java code does not contain
default Direction args values. The default directions arg values are
provided by the Kotlin safe args generation and we should be as
uniform as possible across both languages.

Test: ./gradlew --rerun-tasks navigation:navigation-safe-args-gradle-plugin:test
Change-Id: I07b67d9c86dafff608df49a609796a71a9b3315a
navigation:navigation-safe-args-generator:test
BUG: 141099045

M navigation/navigation-safe-args-generator/src/main/kotlin/androidx/navigation/safe/args/generator/java/JavaNavWriter.kt
M navigation/navigation-safe-args-generator/src/main/kotlin/androidx/navigation/safe/args/generator/java/JavaTypes.kt
M navigation/navigation-safe-args-generator/src/tests/test-data/expected/java_nav_writer_test/MainFragmentArgs.java
M navigation/navigation-safe-args-generator/src/tests/test-data/expected/java_nav_writer_test/MainFragmentDirections.java
M navigation/navigation-safe-args-generator/src/tests/test-data/expected/java_nav_writer_test/Next.java
M navigation/navigation-safe-args-generator/src/tests/test-data/expected/java_nav_writer_test/SanitizedMainFragmentDirections.java
M navigation/navigation-safe-args-generator/src/tests/test-data/expected/nav_generator_test/java/nested_overridden_action/SettingsDirections.java
M navigation/navigation-safe-args-generator/src/tests/test-data/expected/nav_generator_test/java/nested_same_action/SettingsDirections.java
M navigation/navigation-safe-args-generator/src/tests/test-data/expected/nav_generator_test/java/nested_same_action/SettingsFragmentDirections.java

https://android-review.googlesource.com/1133433

https://goto.google.com/android-sha1/2180ea57914af961d4f2bb43802b42ae0d1802e0

jb...@google.com <jb...@google.com> #7Oct 7, 2019 05:37AM

Marked as fixed.

This has been fixed internally and will be available in the Navigation 2.2.0-beta01 release.

ra...@gmail.com <ra...@gmail.com> #8Nov 18, 2019 04:37PM

Using '2.2.0-rc02'. Putting null as a default value for a string, returns a string "@null" when getting that parameter from navArgs
<argument
android:name="deepLinkToken"
android:defaultValue="@null"
app:argType="string"
app:nullable="true" />

And:

val args by navArgs<FragmentArgs>()
args.deepLinkToken // returns "@null"

jb...@google.com <jb...@google.com> #9Nov 18, 2019 07:14PM

Re #8 - please file a separate bugs with a project that reproduce your separate issue. If the issue you are mentioning is covered by

https://issuetracker.google.com/issues/141613546, feel free to +1.