feat(go): add comprehensive unit tests for command serialization by saie-ch · Pull Request #2973 · apache/iggy

saie-ch · 2026-03-18T15:24:00Z

Which issue does this PR close?

Rationale

The Go SDK contains numerous command types that implement the MarshalBinary interface for binary serialization, but many lacked comprehensive unit tests. Without thorough testing, serialization bugs can cause data corruption, runtime panics, and wire protocol incompatibility with the Iggy server and other SDKs.

What changed?

Before: Go SDK had only 6 basic tests for command serialization with no edge case coverage.

After: 88 unit tests (138 including subtests) covering all command types.

Bugs Fixed:

CreatePersonalAccessToken — Expiry field was uint32 serialized with PutUint32 at the wrong offset; changed to uint64 with PutUint64 to
match the Rust wire format (u64_le)
2. CreateTopic / UpdateTopic — MarshalBinary mutated the receiver by assigning t.ReplicationFactor = new(uint8) when nil; replaced with a local
variable
3. UpdateUser — MarshalBinary mutated the receiver by assigning u.Username = new(string) when nil; replaced with a local variable and fixed
buffer size calculation

Test Coverage:

Overall package: with 82.2% coverage.
All tests pass with the race detector enabled.

What this PR does NOT fix

Permissions.MarshalBinary() first byte corruption when streams are nil — fixed in fix(go): correct Permissions serialization and add unit tests #3015

Local Execution:

All 88 tests pass with race detector enabled and 82.2% statement coverage

AI Usage

Tool: Claude Code (claude-sonnet-4.5)

Scope: Test implementation, bug discovery, and cross-SDK validation

Helped design comprehensive test coverage strategy
Generated test structures following Go best practices

codecov · 2026-03-18T15:38:00Z

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 74.10%. Comparing base (7aa4539) to head (026cff8).

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #2973      +/-   ##
============================================
- Coverage     74.16%   74.10%   -0.06%     
  Complexity      943      943              
============================================
  Files          1237     1201      -36     
  Lines        112641   110445    -2196     
  Branches      89201    87518    -1683     
============================================
- Hits          83536    81843    -1693     
+ Misses        26309    25873     -436     
+ Partials       2796     2729      -67

Components	Coverage Δ
Rust Core	`75.26% <ø> (-0.04%)`	⬇️
Java SDK	`58.44% <ø> (ø)`
C# SDK	`69.43% <ø> (-1.23%)`	⬇️
Python SDK	`81.43% <ø> (ø)`
Node SDK	`91.53% <ø> (+0.12%)`	⬆️
Go SDK	`40.37% <100.00%> (+0.45%)`	⬆️

Files with missing lines	Coverage Δ
...reign/go/client/tcp/tcp_access_token_management.go	`100.00% <100.00%> (ø)`
foreign/go/internal/command/access_token.go	`100.00% <100.00%> (ø)`
foreign/go/internal/command/topic.go	`92.10% <100.00%> (+0.21%)`	⬆️
foreign/go/internal/command/update_user.go	`95.12% <100.00%> (+41.46%)`	⬆️
foreign/go/internal/command/user.go	`91.30% <100.00%> (ø)`

... and 73 files with indirect coverage changes

🚀 New features to boost your workflow:

❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.

atharvalade

overall looking good but I found a few things that need to be addressed

atharvalade · 2026-03-19T09:08:53Z

I found 3 pre-existing issues #2980 #2981 #2982
I will wait for this merge and @saie-ch's comments before starting work on the issues mentioned above.

hubcio · 2026-03-19T09:44:39Z

@chengxilo could you please also check this?

chengxilo · 2026-03-19T19:12:27Z

This part should not use byte(0) directly, doesn't align with the behavior in rust sdk.

iggy/core/common/src/types/permissions/permissions_global.rs

Lines 267 to 273 in 9c8b5cc

if current_stream < streams_count {

current_stream += 1;

bytes.put_u8(1);

} else {

bytes.put_u8(0);

}

}

@saie-ch would you mind to solve this in another PR first (to Implement unit test for permission and fix the problem in permission)?

chengxilo · 2026-03-19T19:53:45Z

@@ -43,14 +43,14 @@ func (u *UpdateUser) MarshalBinary() ([]byte, error) {
 	username := *u.Username


Here the u.Username is actually modified by the method, I don't think it's a good approach. Since you already modifed this method, would you mind to modified this too?

chengxilo · 2026-03-19T19:56:22Z

regarding #2973 (comment), I think it would be great to write tests to check whether they are modified after call MarshalBinary, for each command.

saie-ch · 2026-03-20T02:26:09Z

Thanks @atharvalade and @chengxilo, I will implement the necessary changes.

hubcio · 2026-03-26T11:14:56Z

@saie-ch @chengxilo what's the status of this PR? is it ready to be merged? should #3015 be merged first?

saie-ch · 2026-03-26T11:59:03Z

@saie-ch @chengxilo what's the status of this PR? is it ready to be merged? should #3015 be merged first?

Yes please @hubcio, let's wait for that to be merged first. I just pushed new changes.

chengxilo · 2026-03-26T15:08:08Z

This PR may still need some further review and improvement. We should merge #3015 first tho.

hubcio · 2026-03-30T07:08:19Z

#3015 is merged.

hubcio · 2026-03-30T09:00:20Z

@saie-ch @atharvalade what is the difference between this PR and #3037 ?

chengxilo · 2026-03-30T12:48:40Z

@saie-ch @atharvalade what is the difference between this PR and #3037 ?

This one is created a few days earlier and only covers the test for commands.🤕

github-actions · 2026-04-12T00:47:26Z

This pull request has been automatically marked as stale because it has not had recent activity. It will be closed in 7 days if no further activity occurs.

If you need a review, please ensure CI is green and the PR is rebased on the latest master. Don't hesitate to ping the maintainers - either @core on Discord or by mentioning them directly here on the PR.

Thank you for your contribution!

github-actions · 2026-04-25T00:45:39Z

This pull request has been automatically marked as stale because it has not had recent activity. It will be closed in 7 days if no further activity occurs.

If you need a review, please ensure CI is green and the PR is rebased on the latest master. Don't hesitate to ping the maintainers - either @core on Discord or by mentioning them directly here on the PR.

Thank you for your contribution!

atharvalade · 2026-04-29T16:44:23Z

@saie-ch do you plan to implement anything else now that #3015 is merged? Once I get a green light from you, I can start review again and plan to merge this too after reviews. BTW I closed #3037 because of multiple conflicts and outdated code.

saie-ch · 2026-04-29T19:09:25Z

@saie-ch do you plan to implement anything else now that #3015 is merged? Once I get a green light from you, I can start review again and plan to merge this too after reviews. BTW I closed #3037 because of multiple conflicts and outdated code.

Yes, please review. I believe, i've implemented the necessary changes.

github-actions · 2026-05-08T00:54:04Z

This pull request has been automatically marked as stale because it has not had recent activity. It will be closed in 7 days if no further activity occurs.

If you need a review, please ensure CI is green and the PR is rebased on the latest master. Don't hesitate to ping the maintainers - either @core on Discord or by mentioning them directly here on the PR.

Thank you for your contribution!

hubcio · 2026-05-14T11:55:45Z

/ready

hubcio · 2026-05-14T14:42:36Z

@saie-ch I noticed that comments from this PR are not fixed (output from claude code):

  #: 2958694591
  Reviewer: atharvalade
  Location: access_token.go:36
  Ask: Expiry field → uint64, use PutUint64 (current PutUint32 writes expiry into high 32 bits → server reads expiry << 32)
  Status: ❌ NOT fixed — file never touched. Line 24 still uint32, line 36 still PutUint32
  ────────────────────────────────────────
  #: 2958698450
  Reviewer: atharvalade
  Location: user.go:77 (CreateUser)
  Ask: nil-permissions branch must also write permissions_len:u32_le=0
  Status: ❌ NOT fixed — else branch still writes only 1 flag byte; capacity has no +4 for nil case
  ────────────────────────────────────────
  #: 2958701940
  Reviewer: atharvalade
  Location: user.go UpdatePermissions
  Ask: base length = len(userIdBytes)+1+4; else branch must write 4 zero bytes
  Status: ❌ NOT fixed — line 119 still len(userIdBytes)+1, else branch line 142 still single 0 byte. Code untouched
  ────────────────────────────────────────
  #: 2962372305
  Reviewer: chengxilo
  Location: update_user.go:43
  Ask: stop mutating receiver u.Username
  Status: ❌ NOT fixed — lines 39-43 still assign u.Username = new(string) then deref

can you fix them?

/author

saie-ch · 2026-05-14T15:27:45Z

@saie-ch I noticed that comments from this PR are not fixed (output from claude code):

  #: 2958694591
  Reviewer: atharvalade
  Location: access_token.go:36
  Ask: Expiry field → uint64, use PutUint64 (current PutUint32 writes expiry into high 32 bits → server reads expiry << 32)
  Status: ❌ NOT fixed — file never touched. Line 24 still uint32, line 36 still PutUint32
  ────────────────────────────────────────
  #: 2958698450
  Reviewer: atharvalade
  Location: user.go:77 (CreateUser)
  Ask: nil-permissions branch must also write permissions_len:u32_le=0
  Status: ❌ NOT fixed — else branch still writes only 1 flag byte; capacity has no +4 for nil case
  ────────────────────────────────────────
  #: 2958701940
  Reviewer: atharvalade
  Location: user.go UpdatePermissions
  Ask: base length = len(userIdBytes)+1+4; else branch must write 4 zero bytes
  Status: ❌ NOT fixed — line 119 still len(userIdBytes)+1, else branch line 142 still single 0 byte. Code untouched
  ────────────────────────────────────────
  #: 2962372305
  Reviewer: chengxilo
  Location: update_user.go:43
  Ask: stop mutating receiver u.Username
  Status: ❌ NOT fixed — lines 39-43 still assign u.Username = new(string) then deref

can you fix them?

/author

thanks @hubcio , will try to fix them.

…fix 4 bugs

saie-ch · 2026-05-17T18:50:04Z

@hubcio Fixed #1 (Expiry uint32→uint64) and #4 (stop mutating receiver). Also fixed the same mutation pattern in CreateTopic and UpdateTopic, and added non-mutation tests per @chengxilo's ask.

For #2 and #3 — the reviewer's suggestion to write permissions_len:u32_le=0 in the nil case is incorrect per the Rust reference. Both create_user.rs:63-64 and update_permissions.rs:53-54 only write put_u8(0) when permissions are None — no permissions_len field. The Rust test at create_user.rs:201 confirms: &[1,b'u', 1, b'p', 0, 0]. The real buffer bugs were already fixed by PR #3097. The Go code matches the Rust wire format as-is.

hubcio · 2026-05-18T07:03:56Z

you can use /ready at the beginning of the line to change label.

/ready

@saie-ch i will check this later in upcoming days.

hubcio

a few items that don't map to changed lines in this diff:

foreign/go/contracts/users.go Permissions.MarshalBinary iterates p.Streams and stream.Topics (go maps) without sorting keys, so the produced wire bytes are non-deterministic across runs. two calls on the same Permissions value can produce different byte sequences. this file is not touched in this pr, but the new tests do not catch it either (since the structures used have either nil or single-entry maps). worth either fixing here (sort keys before iterating, e.g. slices.Sorted(maps.Keys(p.Streams))) or filing a follow-up.
pr description says "Permissions.MarshalBinary() - Fixed first permission byte corruption when streams are nil" but users.go is unchanged in this pr. that fix landed earlier in #3015 (169a09bcd). consider rewording to "verified by new tests" or dropping the claim.
pr description says "CreateUser - Fixed off-by-one buffer allocation (extra trailing byte)" but old capacity = 4 + N + M and new 1 + N + 1 + M + 1 + 1 = 4 + N + M are arithmetically identical. the change is a readability refactor, not a bugfix.

hubcio · 2026-05-19T05:35:32Z

 	bytes[0] = byte(len(c.Name))
 	copy(bytes[1:], c.Name)
-	binary.LittleEndian.PutUint32(bytes[len(bytes)-4:], c.Expiry)
+	binary.LittleEndian.PutUint64(bytes[1+len(c.Name):], c.Expiry)


copy(bytes[1:], c.Name) writes into a dest of size N+8 but only copies N bytes. works, but reads as if it could overflow. copy(bytes[1:1+len(c.Name)], c.Name) is clearer and lines up with the explicit bytes[1+len(c.Name):] index on the next line.

hubcio · 2026-05-19T05:35:32Z

 	if len(username) != 0 {
-		length += 2 + len(username)
+		length += 1 + len(username)
 	}


len(username) == 0 collapses Username: stringPtr("") to the same wire bytes as Username: nil (has-username=0). that means a caller cannot distinguish "clear the username" from "leave it untouched" - the server sees the latter in both cases. TestSerialize_UpdateUser_EmptyUsername locks this behavior in. is the collapse intentional? if yes, leave a comment explaining it; if no, gate on the pointer (u.Username != nil) instead of the string length.

hubcio · 2026-05-19T05:35:32Z

+func buildExpectedLoginUser(username, password string) []byte {
+	versionBytes := []byte(iggcon.Version)
+	contextBytes := []byte("")
+
+	totalLength := 1 + len(username) + 1 + len(password) +
+		4 + len(versionBytes) + 4 + len(contextBytes)
+
+	buf := make([]byte, totalLength)
+	pos := 0
+
+	buf[pos] = byte(len(username))
+	pos++
+	copy(buf[pos:], username)
+	pos += len(username)
+
+	buf[pos] = byte(len(password))
+	pos++
+	copy(buf[pos:], password)
+	pos += len(password)
+
+	binary.LittleEndian.PutUint32(buf[pos:], uint32(len(versionBytes)))
+	pos += 4
+	copy(buf[pos:], versionBytes)
+	pos += len(versionBytes)
+
+	binary.LittleEndian.PutUint32(buf[pos:], uint32(len(contextBytes)))
+	pos += 4
+	copy(buf[pos:], contextBytes)
+
+	return buf
+}


buildExpectedLoginUser rebuilds the expected bytes the same way the production code does (1-byte len prefix, iggcon.Version, same offsets). if prod is wrong, expected is wrong in lockstep and the assertion passes silently. consider either (a) hardcoding golden bytes for one fixed case with a known/substituted version, or (b) asserting each field individually against literal byte values instead of a mirror helper. the version case alone (TestSerialize_LoginUser_ContainsVersion) reads version from the same offset it was written at, so a wrong offset on both sides would still pass.

hubcio · 2026-05-19T05:35:32Z

+	perms := &iggcon.Permissions{
+		Global: iggcon.GlobalPermissions{
+			ManageServers: true,
+			ReadServers:   true,
+		},
+	}


snap here (and &u / &s / &rf / perms in the cases below) shares pointers with cmd. reflect.DeepEqual on the dereferenced struct values walks through pointers and compares the same backing memory, so a MarshalBinary that mutated *Permissions content (e.g. sorted Streams in place) or wrote through *Username would not be caught. the test only catches pointer reassignment - which is what the old t.ReplicationFactor = new(uint8) bug did, so it works for the fixes in this pr, but the name promises more than it delivers. deep-copy the receiver into snapshot (e.g. via a small helper that returns a value with freshly-allocated *string/*uint8/*Permissions) to actually verify no-mutation.

slbotbm

The changes look alright to me, though there is no validation for the input in most of the implementations that these tests test, and thus there are no negative tests. That means these will silently. This can be a follow-up PR.

Also, I noticed that there were tests testing serialization of empty strings. Aren't those supposed to be errors? Adding them shows that they are expected behaviour, not errors.

slbotbm · 2026-05-19T05:07:40Z

+	cmd := CreatePersonalAccessToken{
+		Name:   "long_token",
+		Expiry: 18446744073709551615, // Max uint64 value


This is a magic number. The following can be used instead:

import "math" x := uint64(math.MaxUint64)

slbotbm · 2026-05-19T05:14:34Z

It looks like internal/command/access_token.go does not have error paths for the commands, always returning bytes, nil or []bytes, nil. Thus cases like Name > 255 chars is not handled by the implementation and would not raise an error.

Implementation could be a follow to this PR.

slbotbm · 2026-05-19T05:20:16Z

Same for this file as access_token.go. Validation for things like Name > 255 chars is not happening.

While CreateConsumerGroup, GetConsumerGroups, etc. return an error, there is no meaningful local validation / error paths.

slbotbm · 2026-05-19T05:27:54Z

Same as previously stated, no negative tests asserting MarshalBinary() errors.

slbotbm · 2026-05-19T05:32:50Z

+func TestSerialize_StoreConsumerOffsetRequest_WithPartition(t *testing.T) {
+	consumerId, _ := iggcon.NewIdentifier(uint32(42))
+	streamId, _ := iggcon.NewIdentifier("stream1")


A test with max uint32 can also be added for StoreConsumerOffsetRequest

slbotbm · 2026-05-19T05:40:58Z

Same pattern as the other files here - no negative/error-case tests here as well, and no validation in session.go

slbotbm · 2026-05-19T05:43:39Z

Same as others - no negative/error-case tests and no validation in system.go.

slbotbm · 2026-05-19T05:44:16Z

+		ClientID: 4294967295, // Max uint32 value
+	}


Magic number

slbotbm · 2026-05-19T05:49:01Z

Same with this - no negative tests.

slbotbm · 2026-05-19T05:50:53Z

same - no negative tests.

slbotbm · 2026-05-19T05:54:29Z

/author

saie-ch · 2026-05-24T14:49:37Z

The changes look alright to me, though there is no validation for the input in most of the implementations that these tests test, and thus there are no negative tests. That means these will silently. This can be a follow-up PR.

Also, I noticed that there were tests testing serialization of empty strings. Aren't those supposed to be errors? Adding them shows that they are expected behaviour, not errors.

The empty string tests reflect the current serialization behavior. Should we remove them until validation is added in the follow-up PR, as you said ?

slbotbm · 2026-05-25T05:33:59Z

The changes look alright to me, though there is no validation for the input in most of the implementations that these tests test, and thus there are no negative tests. That means these will silently. This can be a follow-up PR.
Also, I noticed that there were tests testing serialization of empty strings. Aren't those supposed to be errors? Adding them shows that they are expected behaviour, not errors.

The empty string tests reflect the current serialization behavior. Should we remove them until validation is added in the follow-up PR, as you said ?

maybe @chengxilo would be a better person to ask

ryankert01 · 2026-05-25T14:15:56Z

I think we can change the title of this pr because it also somehow changes some code and fix bug?

chengxilo · 2026-05-26T03:26:17Z

The changes look alright to me, though there is no validation for the input in most of the implementations that these tests test, and thus there are no negative tests. That means these will silently. This can be a follow-up PR.
Also, I noticed that there were tests testing serialization of empty strings. Aren't those supposed to be errors? Adding them shows that they are expected behaviour, not errors.

The empty string tests reflect the current serialization behavior. Should we remove them until validation is added in the follow-up PR, as you said ?

maybe @chengxilo would be a better person to ask

If they are errors, I think it's better to just remove them. The tests should enforce correct behavior rather than just reflecting the current implementation. (I don't think I am a "better person" tho)

hubcio · 2026-05-26T06:05:29Z

Closing this due to lack of value added, no activity from author and code being too hard to review.

atharvalade requested changes Mar 19, 2026

View reviewed changes

Comment thread foreign/go/internal/command/access_token_test.go

Comment thread foreign/go/internal/command/user_test.go

Comment thread foreign/go/internal/command/user_test.go

atharvalade mentioned this pull request Mar 19, 2026

Go SDK: UpdatePermissions omits mandatory permissions_len field when permissions are nil #2982

Open

chengxilo reviewed Mar 19, 2026

View reviewed changes

saie-ch mentioned this pull request Mar 23, 2026

fix(go): correct Permissions serialization and add unit tests #3015

Merged

chengxilo mentioned this pull request Mar 27, 2026

test(go): increase Go SDK Codecov coverage with comprehensive tests #3037

Closed

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saie-ch added 2 commits May 17, 2026 14:53

feat(go): add comprehensive unit tests for command serialization and …

83712ca

…fix 4 bugs

fix(go): address PR review comments for command serialization

59a275b

saie-ch force-pushed the go_unit_tests branch from 6319a42 to 59a275b Compare May 17, 2026 18:19

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address review comments

3da4d2a

address PR review comments

46f7b84

Merge branch 'apache:master' into go_unit_tests

026cff8

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github-actions Bot removed the S-waiting-on-author PR is waiting on author response label May 26, 2026

	if current_stream < streams_count {
	current_stream += 1;
	bytes.put_u8(1);
	} else {
	bytes.put_u8(0);
	}
	}

		@@ -43,14 +43,14 @@ func (u *UpdateUser) MarshalBinary() ([]byte, error) {
		username := *u.Username

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What this PR does NOT fix

Local Execution:

AI Usage

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