Validated Test Packages

The packages below have had their own Go test suites (Go 1.23.1) converted to C#, built against the converted standard library, run under the Go-semantics test host, and differentially compared against a clean go test -json baseline — verdict for verdict. A package is listed only when every Test function’s result matches go test (Example/Benchmark execution is uniformly deferred). See Try it yourself to reproduce any row from a clone with one command.

A few packages carry disclosed divergences: Go tests that assert an exact allocation count, which the managed CLR provably cannot satisfy (Go’s compiler stack-allocates where .NET must heap- allocate). Each is pinned by exact failure signature in a hand-owned, committed go2cs_test_disclosures.json — any other failure is still a hard mismatch.

Phase 4 progress: 43 / 215 testable packages validated — 20.0%

1,078 matching test verdicts · 21 disclosed (updated 2026-07-25 — maintained as part of the Phase-4 validation campaign and grows as packages validate. Denominator: the 215 of 302 converted standard-library packages whose Go 1.23.1 sources define Test functions.)

Package	Tests	Disclosed	What it exercises
bytes	81	7	Byte-slice algorithms; alloc-profile disclosures.
cmp	4		Generics with an ordered-type constraint.
container/heap	7		Heap interface over a slice.
container/list	10		Doubly-linked list — pointers and receiver methods.
container/ring	8		Circular linked list — a pointer graph.
encoding/ascii85	9		Ascii85 encode/decode and streaming wrappers.
encoding/base32	26		Base32 round-trips; io.Pipe rendezvous over the real channel core.
encoding/base64	17		Base64 round-trips; goroutine + time.After timer path.
encoding/binary	137	9	Reflection-driven Read/Write — the bridge’s construction/write-back surface.
encoding/csv	71		CSV parsing; wrapped-error errors.Is through the reflection bridge.
encoding/hex	12		Hex encode/decode and error paths.
encoding/pem	8		PEM block parsing and round-trips.
errors	61		errors.Is/As/Join — reflection-bridge write-back (Value.Set, addressability).
go/build/constraint	89		Build-constraint expression parsing.
go/version	3		Go version-string comparison.
hash/adler32	2		Adler-32 checksum.
hash/crc32	10		CRC-32 including real SSE4.2/PCLMULQDQ hardware paths via managed intrinsics.
hash/crc64	5		CRC-64 checksum tables.
hash/fnv	19		FNV-1/FNV-1a across widths.
internal/abi	2		Runtime ABI helpers (FuncPC).
internal/coverage/slicereader	1		Coverage slice reader.
internal/coverage/slicewriter	1		Coverage slice writer.
internal/gover	5		Toolchain version ordering.
internal/itoa	3		Minimal integer formatting.
internal/saferio	17		Allocation-capped I/O helpers.
io/fs	18		The fs.FS interface family — named-interface runtime shells, fs.Glob deep recursion, dirFS walks.
maps	14		Generic map helpers and iterators.
math	76		The core numeric package — IEEE edge cases, rounding, Inf/NaN.
math/bits	26		Bit-manipulation intrinsics.
math/cmplx	24		complex128 transcendental math.
math/rand	43		PRNG streams, including a child-process race test.
math/rand/v2	36		The v2 PRNG API (PCG, ChaCha8).
net/http/internal/ascii	13		ASCII case-insensitive helpers.
os/signal	1		Console-signal delivery (Ctrl+Break) through real channels and select.
path	9		Pure path manipulation (Clean/Split/Join/Match…).
sort	63		Interface-driven sort, sort.Slice reflection swaps, NaN-aware ordering, stability.
strings	68	4	String algorithms; alloc-count/alloc-profile disclosures.
testing/quick	8		Property testing — reflect value generation and Value.Call dynamic invocation.
text/scanner	18		Rune-level source scanning.
text/tabwriter	3		Elastic-tab column formatting; panic-during-write recovery.
unicode	28		Category tables, case mapping (SpecialCase), script ranges.
unicode/utf16	8	1	Encode/decode round-trips via reflect.DeepEqual.
unicode/utf8	14		UTF-8 encode/decode — the first suite to pass (2026-07-17).