add test case that fails

extism_test.go

@@ -5,6 +5,13 @@ import (
 	"context"
 	"encoding/json"
 	"fmt"
+	"log"
+	"os"
+	"strings"
+	"sync"
+	"testing"
+	"time"
+
 	observe "github.com/dylibso/observe-sdk/go"
 	"github.com/dylibso/observe-sdk/go/adapter/stdout"
 	"github.com/stretchr/testify/assert"
@@ -13,12 +20,6 @@ import (
 	"github.com/tetratelabs/wazero/experimental"
 	"github.com/tetratelabs/wazero/experimental/logging"
 	"github.com/tetratelabs/wazero/sys"
-	"log"
-	"os"
-	"strings"
-	"sync"
-	"testing"
-	"time"
 )
 
 func TestWasmUrl(t *testing.T) {
@@ -1038,6 +1039,35 @@ func TestEnableExperimentalFeature(t *testing.T) {
 	}
 }
 
+func TestModuleLinking(t *testing.T) {
+	manifest := Manifest{
+		Wasm: []Wasm{
+			WasmFile{
+				Path: "wasm/lib.wasm",
+				Name: "lib",
+			},
+			WasmFile{
+				Path: "wasm/main.wasm",
+				Name: "main",
+			},
+		},
+	}
+
+	if plugin, ok := pluginInstance(t, manifest); ok {
+		defer plugin.Close(context.Background())
+
+		exit, output, err := plugin.Call("run_test", []byte("benjamin"))
+
+		if assertCall(t, err, exit) {
+			expected := "Hello, BENJAMIN"
+
+			actual := string(output)
+
+			assert.Equal(t, expected, actual)
+		}
+	}
+}
+
 func BenchmarkInitialize(b *testing.B) {
 	ctx := context.Background()
 	cache := wazero.NewCompilationCache()

plugins/lib/Makefile

@@ -0,0 +1,2 @@
+build:
+	tinygo build -target wasi -o ../../wasm/lib.wasm main.go

plugins/lib/go.mod

@@ -0,0 +1,5 @@
+module github.com/extism/extism-sdk-plugins-lib
+
+go 1.22
+
+require github.com/extism/go-pdk v1.0.2

plugins/lib/go.sum

@@ -0,0 +1,2 @@
+github.com/extism/go-pdk v1.0.2 h1:UB7oTW3tw2zoMlsUdBEDAAbhQg9OudzgNeyCwQYZ730=
+github.com/extism/go-pdk v1.0.2/go.mod h1:Gz+LIU/YCKnKXhgge8yo5Yu1F/lbv7KtKFkiCSzW/P4=

plugins/lib/main.go

@@ -0,0 +1,18 @@
+package main
+
+import (
+	"strings"
+
+	pdk "github.com/extism/go-pdk"
+)
+
+//go:export capitalize
+func Capitalize(ptr uint64) uint64 {
+	mem := pdk.FindMemory(ptr)
+	bytes := mem.ReadBytes()
+	capitalized := strings.ToUpper(string(bytes))
+	out := pdk.AllocateString(capitalized)
+	return out.Offset()
+}
+
+func main() {}

plugins/main/Makefile

@@ -0,0 +1,2 @@
+build:
+	tinygo build -target wasi -o ../../wasm/main.wasm main.go

plugins/main/go.mod

@@ -0,0 +1,5 @@
+module github.com/extism/extism-sdk-plugins-main
+
+go 1.22
+
+require github.com/extism/go-pdk v1.0.2

plugins/main/go.sum

@@ -0,0 +1,2 @@
+github.com/extism/go-pdk v1.0.2 h1:UB7oTW3tw2zoMlsUdBEDAAbhQg9OudzgNeyCwQYZ730=
+github.com/extism/go-pdk v1.0.2/go.mod h1:Gz+LIU/YCKnKXhgge8yo5Yu1F/lbv7KtKFkiCSzW/P4=

plugins/main/main.go

@@ -0,0 +1,24 @@
+package main
+
+import (
+	"github.com/extism/go-pdk"
+)
+
+//go:wasm-module lib
+//export capitalize
+func Capitalize(offset uint64) uint64
+
+//go:export run_test
+func run_test() int32 {
+	name := pdk.InputString()
+
+	ptr := pdk.AllocateString(name)
+	capitalizedPtr := Capitalize(ptr.Offset())
+	capitalizedMem := pdk.FindMemory(capitalizedPtr)
+	capitalized := string(capitalizedMem.ReadBytes())
+
+	pdk.OutputString("Hello, " + capitalized)
+	return 0
+}
+
+func main() {}