Android: unit tests for package install codepaths

[ofalvai]

Before merging #42 and #43, it would give us more confidence if the whole package install codepath was covered with tests (E2E tests don't cover every scenario).

Thanks to #38, unit tests are now possible on the Android side.

Changes

• Extract package installation logic to its own method for direct testing.
• Test that method with all input combinations: raw JS update, ZIP, signature verification, diff updates.

Out of scope

I'd like to land this PR first, then rebase #42 and include new test cases for binary diff patching.

[Copilot]

🟢 Approval recommended

The only unresolved comment is a non-blocking wording nit.

Pull request overview

Adds Android JVM unit coverage for downloaded package installation paths.

Changes:

• Extracts package installation logic for direct testing.
• Tests raw, ZIP, integrity, signature, and differential updates.
• Adds JSON and Mockito test dependencies.

File summaries

File	Description
android/app/src/test/java/com/microsoft/codepush/react/CodePushUpdateManagerTest.kt	Adds installation-path tests. Minor wording nit: change “as long there is” to “as long as there is.”
android/app/src/main/java/com/microsoft/codepush/react/CodePushUpdateManager.java	Extracts installation logic into a package-visible method.
android/app/build.gradle	Adds required test dependencies.

Review details

• Files reviewed: 3/3 changed files
• Comments generated: 1
• Review effort level: Balanced

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