test: make tests run in parallel (#1312)

## Description

This PR simply introduces `t.Parallel()` for unit tests that can support
it.

<details><summary>Contributors' checklist...</summary>

- [x] Added new tests, or not needed, or not feasible
- [x] Provided an example (e.g. screenshot) to aid review or the PR is
self-explanatory
- [x] Updated the official documentation or not needed
- [x] No breaking changes were made, or a `BREAKING CHANGE: xxx` message
was included in the description
- [ ] Added references to related issues and PRs
- [ ] Provided any useful hints for running manual tests
- [ ] Added new benchmarks to [generated
graphs](https://gnoland.github.io/benchmarks), if any. More info
[here](https://github.com/gnolang/gno/blob/master/.benchmarks/README.md).
</details>

---------

Co-authored-by: Guilhem Fanton <8671905+gfanton@users.noreply.github.com>

gno.land/cmd/gnoland/start_test.go

@@ -13,6 +13,8 @@ import (
 )
 
 func TestStartInitialize(t *testing.T) {
+	t.Parallel()
+
 	cases := []struct {
 		args []string
 	}{
@@ -23,8 +25,11 @@ func TestStartInitialize(t *testing.T) {
 	os.Chdir(filepath.Join("..", "..")) // go to repo's root dir
 
 	for _, tc := range cases {
+		tc := tc
 		name := strings.Join(tc.args, " ")
 		t.Run(name, func(t *testing.T) {
+			t.Parallel()
+
 			mockOut := bytes.NewBufferString("")
 			mockErr := bytes.NewBufferString("")
 			io := commands.NewTestIO()

gno.land/pkg/integration/integration_test.go

@@ -5,5 +5,7 @@ import (
 )
 
 func TestTestdata(t *testing.T) {
+	t.Parallel()
+
 	RunGnolandTestscripts(t, "testdata")
 }

gnovm/pkg/gnolang/alloc_test.go

@@ -6,6 +6,8 @@ import (
 )
 
 func TestAllocSizes(t *testing.T) {
+	t.Parallel()
+
 	// go elemental
 	println("_allocPointer", unsafe.Sizeof(&StructValue{}))
 	println("_allocSlice", unsafe.Sizeof([]byte("12345678901234567890123456789012345678901234567890")))

gnovm/pkg/gnolang/gno_test.go

@@ -13,6 +13,8 @@ import (
 
 // run empty main().
 func TestRunEmptyMain(t *testing.T) {
+	t.Parallel()
+
 	m := NewMachine("test", nil)
 	main := FuncD("main", nil, nil, nil)
 	m.RunDeclaration(main)
@@ -21,6 +23,8 @@ func TestRunEmptyMain(t *testing.T) {
 
 // run main() with a for loop.
 func TestRunLoopyMain(t *testing.T) {
+	t.Parallel()
+
 	m := NewMachine("test", nil)
 	c := `package test
 func main() {
@@ -36,6 +40,8 @@ func main() {
 }
 
 func TestEval(t *testing.T) {
+	t.Parallel()
+
 	m := NewMachine("test", nil)
 	c := `package test
 func next(i int) int {
@@ -64,6 +70,8 @@ func assertOutput(t *testing.T, input string, output string) {
 }
 
 func TestRunMakeStruct(t *testing.T) {
+	t.Parallel()
+
 	assertOutput(t, `package test
 type Outfit struct {
 	Scarf string
@@ -90,6 +98,8 @@ func main() {
 }
 
 func TestRunReturnStruct(t *testing.T) {
+	t.Parallel()
+
 	assertOutput(t, `package test
 type MyStruct struct {
 	FieldA string
@@ -160,6 +170,8 @@ type Struct1 struct {
 }
 
 func TestModifyTypeAsserted(t *testing.T) {
+	t.Parallel()
+
 	x := Struct1{1, 1}
 	var v interface{} = x
 	x2 := v.(Struct1)
@@ -176,6 +188,8 @@ type Interface1 interface {
 }
 
 func TestTypeConversion(t *testing.T) {
+	t.Parallel()
+
 	x := 1
 	var v interface{} = x
 	if _, ok := v.(Interface1); ok {
@@ -193,6 +207,8 @@ func TestTypeConversion(t *testing.T) {
 }
 
 func TestSomething(t *testing.T) {
+	t.Parallel()
+
 	type Foo struct {
 		X interface{}
 	}
@@ -210,6 +226,8 @@ func TestSomething(t *testing.T) {
 
 // XXX is there a way to test in Go as well as Gno?
 func TestDeferOrder(t *testing.T) {
+	t.Parallel()
+
 	a := func() func(int, int) int {
 		fmt.Println("a constructed")
 		return func(x int, y int) int {
@@ -238,6 +256,8 @@ func TestDeferOrder(t *testing.T) {
 
 // XXX is there a way to test in Go as well as Gno?
 func TestCallOrder(t *testing.T) {
+	t.Parallel()
+
 	a := func() func(int, int) int {
 		fmt.Println("a constructed")
 		return func(x int, y int) int {
@@ -264,6 +284,8 @@ func TestCallOrder(t *testing.T) {
 
 // XXX is there a way to test in Go as well as Gno?
 func TestBinaryShortCircuit(t *testing.T) {
+	t.Parallel()
+
 	tr := func() bool {
 		fmt.Println("t called")
 		return true
@@ -281,6 +303,8 @@ func TestBinaryShortCircuit(t *testing.T) {
 
 // XXX is there a way to test in Go as well as Gno?
 func TestSwitchDefine(t *testing.T) {
+	t.Parallel()
+
 	var x interface{} = 1
 	switch y := x.(type) {
 	case int:
@@ -292,6 +316,8 @@ func TestSwitchDefine(t *testing.T) {
 
 // XXX is there a way to test in Go as well as Gno?
 func TestBinaryCircuit(t *testing.T) {
+	t.Parallel()
+
 	tr := func() bool {
 		fmt.Println("tr() called")
 		return true
@@ -316,6 +342,8 @@ func TestBinaryCircuit(t *testing.T) {
 }
 
 func TestMultiAssignment(t *testing.T) {
+	t.Parallel()
+
 	buf := make([]int, 4)
 	ref := func(i int) *int {
 		fmt.Printf("ref(%v) called\n", i)
@@ -342,6 +370,8 @@ func TestMultiAssignment(t *testing.T) {
 
 // XXX is there a way to test in Go as well as Gno?
 func TestCallLHS(t *testing.T) {
+	t.Parallel()
+
 	x := 1
 	xptr := func() *int {
 		return &x
@@ -352,6 +382,8 @@ func TestCallLHS(t *testing.T) {
 
 // XXX is there a way to test in Go as well as Gno?
 func TestCallFieldLHS(t *testing.T) {
+	t.Parallel()
+
 	type str struct {
 		X int
 	}

gnovm/pkg/gnolang/go2gno_test.go

@@ -8,6 +8,8 @@ import (
 )
 
 func TestParseForLoop(t *testing.T) {
+	t.Parallel()
+
 	gocode := `package main
 func main(){
 	for i:=0; i<10; i++ {

gnovm/pkg/gnolang/gonative_test.go

@@ -98,6 +98,8 @@ D:
 }
 
 func TestGoNativeDefine3(t *testing.T) {
+	t.Parallel()
+
 	// Create package foo and define Foo.
 	out := new(bytes.Buffer)
 	pkg := NewPackageNode("foo", "test.foo", nil)
@@ -135,6 +137,8 @@ D:
 }
 
 func TestCrypto(t *testing.T) {
+	t.Parallel()
+
 	addr := crypto.Address{}
 	store := gonativeTestStore()
 	tv := Go2GnoValue(nilAllocator, store, reflect.ValueOf(addr))

gnovm/pkg/gnolang/package_test.go

@@ -12,6 +12,8 @@ import (
 
 // Tries to reproduce the bug #1036 on all registered types
 func TestAminoJSONRegisteredTypes(t *testing.T) {
+	t.Parallel()
+
 	for _, typ := range Package.Types {
 		// Instantiate registered type
 		x := reflect.New(typ.Type).Interface()

gnovm/pkg/gnolang/precompile_test.go

@@ -12,6 +12,8 @@ import (
 )
 
 func TestPrecompile(t *testing.T) {
+	t.Parallel()
+
 	cases := []struct {
 		name                      string
 		source                    string
@@ -56,6 +58,8 @@ func TestPrecompile(t *testing.T) {
 	for _, c := range cases {
 		c := c // scopelint
 		t.Run(c.name, func(t *testing.T) {
+			t.Parallel()
+
 			// parse gno
 			fset := token.NewFileSet()
 			f, err := parser.ParseFile(fset, "foo.go", c.source, parser.ParseComments)

gnovm/pkg/gnolang/values_conversions_test.go

@@ -9,6 +9,8 @@ import (
 )
 
 func TestConvertUntypedBigdecToFloat(t *testing.T) {
+	t.Parallel()
+
 	dst := &TypedValue{}
 
 	dec, err := apd.New(-math.MaxInt64, -4).SetFloat64(math.SmallestNonzeroFloat64 / 2)

gnovm/pkg/repl/repl_test.go

@@ -199,6 +199,8 @@ func TestRepl(t *testing.T) {
 }
 
 func TestReplOpts(t *testing.T) {
+	t.Parallel()
+
 	require := require.New(t)
 
 	r := NewRepl(WithStd(nil, nil, nil), WithStore(nil))
@@ -212,6 +214,8 @@ func TestReplOpts(t *testing.T) {
 }
 
 func TestReplReset(t *testing.T) {
+	t.Parallel()
+
 	require := require.New(t)
 
 	r := NewRepl()

gnovm/tests/selector_test.go

@@ -52,6 +52,8 @@ func _printValue(x interface{}) {
 }
 
 func TestSelectors(t *testing.T) {
+	t.Parallel()
+
 	x0 := struct{ F0 int }{1}
 	_printValue(x0.F0) //       *ST.F0
 	//                            F:0

misc/docker-integration/integration_test.go

@@ -29,6 +29,8 @@ const (
 )
 
 func TestDockerIntegration(t *testing.T) {
+	t.Parallel()
+
 	tmpdir, err := os.MkdirTemp(os.TempDir(), "*-gnoland-integration")
 	require.NoError(t, err)
 

tm2/pkg/amino/amino_test.go

@@ -10,6 +10,8 @@ import (
 )
 
 func TestMarshal(t *testing.T) {
+	t.Parallel()
+
 	cdc := amino.NewCodec()
 
 	type SimpleStruct struct {
@@ -35,6 +37,8 @@ func TestMarshal(t *testing.T) {
 }
 
 func TestUnmarshalReader(t *testing.T) {
+	t.Parallel()
+
 	cdc := amino.NewCodec()
 
 	type SimpleStruct struct {
@@ -65,6 +69,8 @@ type stringWrapper struct {
 }
 
 func TestUnmarshalReaderSize(t *testing.T) {
+	t.Parallel()
+
 	cdc := amino.NewCodec()
 
 	s1 := stringWrapper{"foo"}
@@ -82,6 +88,8 @@ func TestUnmarshalReaderSize(t *testing.T) {
 }
 
 func TestUnmarshalReaderSizeLimit(t *testing.T) {
+	t.Parallel()
+
 	cdc := amino.NewCodec()
 
 	s1 := stringWrapper{"foo"}
@@ -101,6 +109,8 @@ func TestUnmarshalReaderSizeLimit(t *testing.T) {
 }
 
 func TestUnmarshalReaderTooLong(t *testing.T) {
+	t.Parallel()
+
 	cdc := amino.NewCodec()
 
 	type SimpleStruct struct {
@@ -125,6 +135,8 @@ func TestUnmarshalReaderTooLong(t *testing.T) {
 }
 
 func TestUnmarshalBufferedWritesReads(t *testing.T) {
+	t.Parallel()
+
 	cdc := amino.NewCodec()
 	buf := bytes.NewBuffer(nil)
 
@@ -155,6 +167,8 @@ func TestUnmarshalBufferedWritesReads(t *testing.T) {
 }
 
 func TestBoolPointers(t *testing.T) {
+	t.Parallel()
+
 	cdc := amino.NewCodec()
 	type SimpleStruct struct {
 		BoolPtrTrue  *bool

tm2/pkg/amino/binary_encode_test.go

@@ -8,13 +8,17 @@ import (
 )
 
 func TestEncodeFieldNumberAndTyp3_1(t *testing.T) {
+	t.Parallel()
+
 	buf := new(bytes.Buffer)
 	err := encodeFieldNumberAndTyp3(buf, 1, Typ3ByteLength)
 	assert.Nil(t, err)
 	assert.Equal(t, []byte{byte(0x01<<3 | Typ3ByteLength)}, buf.Bytes())
 }
 
 func TestEncodeFieldNumberAndTyp3_2(t *testing.T) {
+	t.Parallel()
+
 	buf := new(bytes.Buffer)
 	err := encodeFieldNumberAndTyp3(buf, 2, Typ3ByteLength)
 	assert.Nil(t, err)