test(SingleInputComponent): add expect and fix warning

[vtsvetkov-splunk]

Issue number:

PR Type

What kind of change does this PR introduce?

• Feature
• Bug Fix
• Refactoring (no functional or API changes)
• Documentation Update
• Maintenance (dependency updates, CI, etc.)

Summary

Motivation

Every PR has this

but it is just a warning, so it does not fail the build

Changes

• eslint considers this as an error instead of warning
• fix the issue by adding explicit expects

User experience

No change

Checklist

If an item doesn't apply to your changes, leave it unchecked.

• I have performed a self-review of this change according to the development guidelines
• Tests have been added/modified to cover the changes (testing doc)
• Changes are documented
• PR title and description follows the contributing principles