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Testing v-show Directive Compilation in dcloudio/uni-app Android Templates

This test suite examines the v-show directive implementation in the uni-app UTS Android transformation layer. It verifies the correct compilation and transformation of v-show directives in view templates to their corresponding runtime implementations.

Test Coverage Overview

The test suite focuses on the compilation behavior of v-show directives in view templates for Android platforms.

Tests basic v-show directive binding on view elements
Verifies correct transformation to withDirectives and vShow runtime calls
Ensures proper NEED_PATCH flag implementation

Implementation Analysis

The testing approach uses template string comparison to verify the compiler output matches expected transformations. The implementation leverages Jest’s describe/test structure with custom assert utilities to compare template input against expected compiled output.

Uses string-based template assertions
Validates directive binding syntax
Confirms correct runtime directive registration

Technical Details

Testing Framework: Jest
Custom Assert Utilities: testUtils
Test Type: Unit
Key Components: Template compiler, v-show directive transformer
Runtime Dependencies: withDirectives, createElementVNode, vShow

Best Practices Demonstrated

The test demonstrates effective compiler transformation testing practices by using isolated unit tests with clear input/output expectations. It follows established patterns for directive compilation verification.

Isolated transformation testing
Clear template input/output validation
Specific compiler flag verification
Structured test organization

dcloudio/uni-app

packages/uni-app-uts/__tests__/android/transforms/vShow.spec.ts

            
import { assert } from '../testUtils'

describe('compiler:v-show', () => {
  test('template v-show', () => {
    assert(
      `<view v-show="a"></view>`,
      `withDirectives(createElementVNode("view", null, null, 512 /* NEED_PATCH */), [
  [vShow, _ctx.a]
])`
    )
  })
})