add complex integration test

gopherjs · grantnelson-wf · Aug 18, 2025 · Aug 15, 2025 · Aug 15, 2025 · Aug 15, 2025
commit 99b9ba601089c9417bfff6b4a1f3f45ec9be3dfe
diff --git a/tests/gencircle_test.go b/tests/gencircle_test.go
@@ -20,6 +20,8 @@ func Test_GenCircle_Burninate(t *testing.T) { runGenCircleTest(t, `burninate`) }
 
 func Test_GenCircle_CatBox(t *testing.T) { runGenCircleTest(t, `catbox`) }
 
+func Test_GenCircle_Trammel(t *testing.T) { runGenCircleTest(t, `trammel`) }
+
 // Cache buster: Keeping the tests from using cached results when only
 // the test application files are changed.
 //

diff --git a/tests/testdata/gencircle/trammel/cmp/cmp.go b/tests/testdata/gencircle/trammel/cmp/cmp.go
@@ -0,0 +1,10 @@
+package cmp
+
+// Barrowed from the cmp package in the Go standard library
+// that isn't available until go1.21.
+type Ordered interface {
+	~int | ~int8 | ~int16 | ~int32 | ~int64 |
+		~uint | ~uint8 | ~uint16 | ~uint32 | ~uint64 | ~uintptr |
+		~float32 | ~float64 |
+		~string
+}
diff --git a/tests/testdata/gencircle/trammel/collections/collections.go b/tests/testdata/gencircle/trammel/collections/collections.go
@@ -0,0 +1,31 @@
+package collections
+
+func Populate[K comparable, V any, SK ~[]K, SV ~[]V, M ~map[K]V](m M, keys SK, values SV) {
+	// Lots of type parameters with parameters referencing each other.
+	for i, k := range keys {
+		if i < len(values) {
+			m[k] = values[i]
+		} else {
+			var zero V
+			m[k] = zero
+		}
+	}
+}
+
+func KeysAndValues[K comparable, V any, M ~map[K]V](m M) struct {
+	Keys   []K
+	Values []V
+} {
+	keys := make([]K, 0, len(m))
+	values := make([]V, 0, len(m))
+	for k, v := range m {
+		keys = append(keys, k)
+		values = append(values, v)
+	}
+	// nested generic type that has a type parameter and nest type parameter.
+	type result[T any] struct {
+		Keys   []T
+		Values []V
+	}
+	return result[K]{Keys: keys, Values: values}
+}
diff --git a/tests/testdata/gencircle/trammel/main.go b/tests/testdata/gencircle/trammel/main.go
@@ -0,0 +1,38 @@
+// This is a test of several different kinds of generics.
+// It is purposefully overly complecated for testing purposes.
+// This integration test is similar to `compiler.Test_CrossPackageAnalysis`.
+
+package main
+
+import (
+	"fmt"
+
+	"github.com/gopherjs/gopherjs/tests/testdata/gencircle/trammel/cmp"
+	"github.com/gopherjs/gopherjs/tests/testdata/gencircle/trammel/collections"
+	"github.com/gopherjs/gopherjs/tests/testdata/gencircle/trammel/stable"
+)
+
+type StableMap[K cmp.Ordered, V any] map[K]V
+
+func (m StableMap[K, V]) String() string {
+	return stable.MapString(m, func(k K, v V) string {
+		return fmt.Sprintf(`%v: %v`, k, v)
+	})
+}
+
+type SIMap = StableMap[string, int]
+type ISMap = StableMap[int, string]
+
+func main() {
+	m1 := SIMap{}
+	collections.Populate(m1,
+		[]string{"one", "two", "three"},
+		[]int{1, 2, 3})
+	println(m1.String())
+
+	m2 := ISMap{}
+	collections.Populate(m2,
+		[]int{4, 5, 6},
+		[]string{"four", "five", "six"})
+	println(m2.String())
+}
diff --git a/tests/testdata/gencircle/trammel/main.out b/tests/testdata/gencircle/trammel/main.out
@@ -0,0 +1,2 @@
+{one: 1, three: 3, two: 2}
+{4: four, 5: five, 6: six}
diff --git a/tests/testdata/gencircle/trammel/sorts/sorts.go b/tests/testdata/gencircle/trammel/sorts/sorts.go
@@ -0,0 +1,30 @@
+package sorts
+
+import "github.com/gopherjs/gopherjs/tests/testdata/gencircle/trammel/cmp"
+
+func Pair[K cmp.Ordered, V any, SK ~[]K, SV ~[]V](k SK, v SV) {
+	Bubble(struct { // non-generic struct in a generic context.
+		len  func() int
+		less func(i, j int) bool
+		swap func(i, j int)
+	}{
+		len:  func() int { return len(k) },
+		less: func(i, j int) bool { return k[i] < k[j] },
+		swap: func(i, j int) { k[i], v[i], k[j], v[j] = k[j], v[j], k[i], v[i] },
+	})
+}
+
+func Bubble(f struct {
+	len  func() int
+	less func(i, j int) bool
+	swap func(i, j int)
+}) {
+	length := f.len()
+	for i := 0; i < length; i++ {
+		for j := i + 1; j < length; j++ {
+			if f.less(j, i) {
+				f.swap(i, j)
+			}
+		}
+	}
+}
diff --git a/tests/testdata/gencircle/trammel/stable/mapString.go b/tests/testdata/gencircle/trammel/stable/mapString.go
@@ -0,0 +1,43 @@
+package stable
+
+import (
+	"strings"
+
+	"github.com/gopherjs/gopherjs/tests/testdata/gencircle/trammel/cmp"
+	"github.com/gopherjs/gopherjs/tests/testdata/gencircle/trammel/collections"
+	"github.com/gopherjs/gopherjs/tests/testdata/gencircle/trammel/sorts"
+)
+
+func MapString[K cmp.Ordered, V any, M ~map[K]V](m M, stringer func(K, V) string) string {
+	// Function parameter with type parameters arguments.
+	result := collections.KeysAndValues(m)
+	keys := result.Keys
+	values := result.Values
+
+	sorts.Pair(keys, values)
+
+	parts := zipper(keys, values, stringer)
+	return `{` + strings.Join(parts, `, `) + `}`
+}
+
+func zipper[TIn1, TIn2, TOut any, SIn1 ~[]TIn1, SIn2 ~[]TIn2, F ~func(TIn1, TIn2) TOut](s1 SIn1, s2 SIn2, merge F) []TOut {
+	// Overly complex type parameters including a generic function type.
+	min := len(s1)
+	if len(s2) < min {
+		min = len(s2)
+	}
+	result := make([]any, min)
+	for i := 0; i < min; i++ {
+		result[i] = merge(s1[i], s2[i])
+	}
+	return castSlice[any, TOut](result)
+}
+
+func castSlice[TIn, TOut any, SIn ~[]TIn, SOut []TOut](s SIn) SOut {
+	result := make(SOut, len(s))
+	for i, v := range s {
+		// Using a type parameter to cast the type.
+		result[i] = any(v).(TOut)
+	}
+	return result
+}
Original file line number	Diff line number	Diff line change
		@@ -0,0 +1,2 @@
		{one: 1, three: 3, two: 2}
		{4: four, 5: five, 6: six}