Enhanced the demo test to cover comprehensive import scenarios:
- Test 1: build.Default context with GOOS/GOARCH validation
- Test 2: Standard library package import (fmt)
- Test 3: Nested standard library package (os/exec)
- Test 4: Internal package import (internal/cpu)
- Test 5: Runtime package with Dir validation
- Test 6: ImportDir with current directory
- Test 7: IsLocalImport with multiple path formats
- Test 8: Context GOPATH/GOROOT validation
- Test 9: Import with AllowBinary flag
- Test 10: Release tags validation
All tests include proper result validation to ensure go/build
patches work correctly across different use cases.
🤖 Generated with [codeagent](https://github.com/qbox/codeagent)
Co-authored-by: luoliwoshang <luoliwoshang@users.noreply.github.com>
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