test: add unit tests for key server/models validation types

[mason5052]

What

Add unit tests for validation logic across key server/models types: users, providers, API tokens, flows, tasks, containers, assistants, prompts, roles, and custom validators.

This does not cover every exported validator in the package (log models, analytics, msgchains, screenshots, and vecstore models are not included).

Why

These model types contain security-sensitive validation functions (password strength, OAuth scope, JWT claims, API token TTL bounds) and core domain validation (enum status types, struct field requirements, nested model validation). None had test coverage.

Test Files

File	Tested Types
users_test.go	UserStatus, UserType, Login, Password, User, UserPassword, AuthCallback, UserRole, UserRolePrivileges, UserPreferences
providers_test.go	ProviderType (10 types), Provider, CreateProvider, PatchProvider, ProviderInfo
api_tokens_test.go	TokenStatus, APIToken, APITokenWithSecret, CreateAPITokenRequest, UpdateAPITokenRequest, APITokenClaims
flows_test.go	FlowStatus, TaskStatus, SubtaskStatus, ContainerStatus, ContainerType, Flow, FlowTasksSubtasks, FlowContainers, Task, TaskSubtasks, Subtask, Container, Role, Privilege, RolePrivileges, PatchFlow
init_test.go	Custom validators (stpass, vmail, oauth_min_scope, solid, semver, semverex), scanFromJSON
assistants_test.go	AssistantStatus, Assistant, CreateAssistant, PatchAssistant, AssistantFlow
prompts_test.go	PromptType, Prompt, PatchPrompt

Test Approach

• All tests use t.Parallel() for fast execution
• Table-driven tests for enum validation with valid and invalid cases
• Boundary testing for numeric constraints (TTL min=60, max=94608000)
• Cross-field validation (Password confirm mismatch, current != new)
• Nested struct validation (AssistantFlow, FlowTasksSubtasks, FlowContainers, TaskSubtasks, UserRolePrivileges)
• Same-package testing for access to unexported validate and scanFromJSON

Verification

cd backend && go test ./pkg/server/models/ -count=1 -v
# 347 test cases pass

[Copilot]

Pull request overview

Adds unit test coverage for backend/pkg/server/models validation logic to ensure core model validators (users, providers, flows, API tokens, and custom validators) are exercised and regressions are caught early.

Changes:

• Introduces table-driven unit tests for enum/string validators and Valid() methods across key models.
• Adds boundary/negative-case tests for security-sensitive validation rules (password strength, OAuth scopes, JWT-related claims).
• Adds tests for helper/validator initialization and JSON scan helpers.

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 19 comments.

Show a summary per file

File	Description
backend/pkg/server/models/users_test.go	Adds tests for user/login/password models, role linking, and preferences JSON scan/value behavior.
backend/pkg/server/models/providers_test.go	Adds tests for provider type validation and provider create/patch/info payload validation.
backend/pkg/server/models/api_tokens_test.go	Adds tests for API token status/struct validation, TTL boundaries, and claims validation.
backend/pkg/server/models/flows_test.go	Adds tests for flow/task/subtask/container status/type validation and patch action validation.
backend/pkg/server/models/init_test.go	Adds tests for custom validators (stpass, vmail, oauth_min_scope, solid, semver, semverex) and scanFromJSON.

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.

[Copilot]

This assertion calls up.Valid() twice; the second call is unnecessary and can hide issues if Valid() becomes stateful. Store the error once (e.g., err := up.Valid()) and assert on err/err.Error().

Suggested change

	assert.Error(t, up.Valid())
	assert.Contains(t, up.Valid().Error(), "user_id is required")
	err := up.Valid()
	assert.Error(t, err)
	assert.Contains(t, err.Error(), "user_id is required")

[asdek]

hey @mason5052

there are correct notice from Copilot side, you need to change these syntax constructions to make immutable tt variable in the loops.

[mason5052]

Fixed -- added tt := tt inside every for _, tt := range loop across all 7 test files. All tests still pass (go test ./pkg/server/models/... ok). Thanks for the Copilot catch!

[asdek]

Thank you for PR and fixes!