Add UT for pkg/driver/fileOps.go

[Bhagyashreek8]

Describe your changes

Issue ticket number and link

Checklist before requesting a review

• I have performed a self-review of my code
• If it is a core feature, I have added thorough tests.
• I have made sure existing UTs are not impacted
• I have executed all necessary linter and made sure internal pipeline/travis is not broken

[ashimagarg27]

@Bhagyashreek8
Could you please run following commands and share o/p:

make coverage
go tool cover -html=cover.out

[Bhagyashreek8]

[Bhagyashreek8]

UT o/p

=== RUN   TestSetupSidecar
=== RUN   TestSetupSidecar/ValidGroupID
2025-07-27T21:53:15.715+0530	INFO	driver/fileOps.go:49	Setting owner and permissions of csi socket file. SIDECAR_GROUP_ID env must match the 'livenessprobe' sidecar container groupID for csi socket connection.
2025-07-27T21:53:15.715+0530	INFO	driver/fileOps.go:73	Successfully set owner and permissions of csi socket file.
=== RUN   TestSetupSidecar/InvalidGroupID
2025-07-27T21:53:15.715+0530	INFO	driver/fileOps.go:49	Setting owner and permissions of csi socket file. SIDECAR_GROUP_ID env must match the 'livenessprobe' sidecar container groupID for csi socket connection.
=== RUN   TestSetupSidecar/EmptyGroupID
2025-07-27T21:53:15.715+0530	INFO	driver/fileOps.go:49	Setting owner and permissions of csi socket file. SIDECAR_GROUP_ID env must match the 'livenessprobe' sidecar container groupID for csi socket connection.
2025-07-27T21:53:15.715+0530	WARN	driver/fileOps.go:53	Unable to fetch SIDECAR_GROUP_ID environment variable. Sidecar container(s) might fail...
github.com/IBM/ibm-object-csi-driver/pkg/driver.setupSidecar
	/Users/bhagyashreek/Documents/ObjectCsiDriver/ibm-object-csi-driver/pkg/driver/fileOps.go:53
github.com/IBM/ibm-object-csi-driver/pkg/driver.TestSetupSidecar.func1
	/Users/bhagyashreek/Documents/ObjectCsiDriver/ibm-object-csi-driver/pkg/driver/fileOps_test.go:143
testing.tRunner
	/Users/bhagyashreek/go/pkg/mod/golang.org/toolchain@v0.0.1-go1.24.4.darwin-arm64/src/testing/testing.go:1792
2025-07-27T21:53:15.715+0530	INFO	driver/fileOps.go:73	Successfully set owner and permissions of csi socket file.
=== RUN   TestSetupSidecar/ChownError
2025-07-27T21:53:15.715+0530	INFO	driver/fileOps.go:49	Setting owner and permissions of csi socket file. SIDECAR_GROUP_ID env must match the 'livenessprobe' sidecar container groupID for csi socket connection.
=== RUN   TestSetupSidecar/ChmodError
2025-07-27T21:53:15.715+0530	INFO	driver/fileOps.go:49	Setting owner and permissions of csi socket file. SIDECAR_GROUP_ID env must match the 'livenessprobe' sidecar container groupID for csi socket connection.
--- PASS: TestSetupSidecar (0.00s)
    --- PASS: TestSetupSidecar/ValidGroupID (0.00s)
    --- PASS: TestSetupSidecar/InvalidGroupID (0.00s)
    --- PASS: TestSetupSidecar/EmptyGroupID (0.00s)
    --- PASS: TestSetupSidecar/ChownError (0.00s)
    --- PASS: TestSetupSidecar/ChmodError (0.00s)