test(amber): add unit tests for workflow-core PartitionInfo, WorkflowRuntimeException, WorkflowContext

[Yicong-Huang]

What changes were proposed in this PR?

Adds scalatest coverage for three small common/workflow-core modules that had no dedicated specs:

• PartitionInfoSpec — satisfies reflexivity + UnknownPartition universal-accepter + non-symmetric semantics, merge same/different/RangePartition-override, RangePartition.apply factory's empty-names fallback to UnknownPartition, @JsonSubTypes registration set, case-class equality.
• WorkflowRuntimeExceptionSpec — all four constructor overloads (message-only, message + cause + workerId, cause + workerId, cause-only, no-arg), null-cause fallback, toString returning the raw message field.
• WorkflowContextSpec — companion-object pinned defaults (workflow id 1L, execution id 1L), default-constructed instance honours those, var field reassignment, constructor argument override.

Any related issues, documentation, discussions?

Closes #4804.

Bug pinned in the spec with explanatory comment (filed separately as a Bug issue): the @JsonSubTypes annotation on PartitionInfo does not register OneToOnePartition, so Jackson cannot deserialize a polymorphic payload that selects that subclass via the type field. The other five concrete partitions are all registered.

How was this PR tested?

sbt scalafmtCheckAll
sbt "WorkflowCore/testOnly org.apache.texera.amber.core.workflow.PartitionInfoSpec org.apache.texera.amber.core.WorkflowRuntimeExceptionSpec org.apache.texera.amber.core.workflow.WorkflowContextSpec"

Was this PR authored or co-authored using generative AI tooling?

Generated-by: Claude Code (claude-opus-4-7)

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 42.08%. Comparing base (ef0634d) to head (1cb3c6d).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #4806      +/-   ##
============================================
+ Coverage     42.04%   42.08%   +0.03%     
- Complexity     2161     2170       +9     
============================================
  Files           980      980              
  Lines         36292    36292              
  Branches       3783     3783              
============================================
+ Hits          15260    15272      +12     
+ Misses        20110    20100      -10     
+ Partials        922      920       -2     

Flag	Coverage Δ
access-control-service	39.53% <ø> (ø)
amber	42.95% <ø> (+0.07%)	⬆️
computing-unit-managing-service	0.00% <ø> (ø)
config-service	0.00% <ø> (ø)
file-service	33.24% <ø> (ø)
workflow-compiling-service	47.72% <ø> (ø)

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[Copilot]

Pull request overview

Adds ScalaTest unit coverage for three previously untested common/workflow-core components, focusing on partition semantics, workflow-context defaults/mutability, and WorkflowRuntimeException constructor/toString behavior.

Changes:

• Add PartitionInfoSpec covering satisfies, merge, RangePartition.apply fallback behavior, and current @JsonSubTypes registration.
• Add WorkflowRuntimeExceptionSpec covering constructor overloads, null-cause behavior, and toString.
• Add WorkflowContextSpec covering companion defaults, default construction, field reassignment, and constructor overrides.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 1 comment.

File	Description
common/workflow-core/src/test/scala/org/apache/texera/amber/core/workflow/WorkflowContextSpec.scala	Tests pinned defaults and mutability/override behavior for WorkflowContext.
common/workflow-core/src/test/scala/org/apache/texera/amber/core/workflow/PartitionInfoSpec.scala	Tests partition compatibility/merge rules and inspects Jackson subtype registration.
common/workflow-core/src/test/scala/org/apache/texera/amber/core/WorkflowRuntimeExceptionSpec.scala	Tests WorkflowRuntimeException constructors, cause/worker capture, and toString.

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