fix(@schematics/angular): preserve Jasmine stub-by-default semantics for bare spies#33266
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This pull request refactors the Jasmine-to-Vitest schematic spy transformer to append .mockReturnValue(undefined) by default to spyOn and spyOnProperty calls, preserving stub-by-default semantics unless chained with .and strategies. It also restructures the transformation logic into smaller helper functions to support chained spies with bracket notation, non-null assertions, type assertions, and satisfies expressions. The code review feedback recommends adding defensive checks to prevent potential runtime crashes when returnValue() or throwError() are called without arguments, and suggests using ts.isStringLiteralLike to more robustly handle bracket notation.
…for bare spies The refactor-jasmine-vitest schematic previously migrated bare spyOn and spyOnProperty calls as a direct mechanical rename to vi.spyOn. Since the APIs feature opposing default behaviors (with jasmine.spyOn stubbing by default and vi.spyOn calling through), this caused migrated test suites to silently change behavior. This update structurally analyzes the AST during translation to detect chained strategies, appending .mockReturnValue(undefined) precisely for bare spies to retain original Jasmine semantics. Fixes angular#33253
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The refactor-jasmine-vitest schematic previously migrated bare spyOn and spyOnProperty calls as a direct mechanical rename to vi.spyOn. Since the APIs feature opposing default behaviors (with jasmine.spyOn stubbing by default and vi.spyOn calling through), this caused migrated test suites to silently change behavior.
This update structurally analyzes the AST during translation to detect chained strategies, appending .mockReturnValue(undefined) precisely for bare spies to retain original Jasmine semantics.