From a48c0d9f2ca74ffc0ef87429989c9f7b8a35c254 Mon Sep 17 00:00:00 2001
From: Hajime Hoshi <hajimehoshi@gmail.com>
Date: Mon, 17 Aug 2020 04:12:31 +0900
Subject: [PATCH] ebiten: Skip some tests on Go1.12 Wasm

---
 .github/workflows/test.yml |  3 +++
 image_test.go              | 30 ++++++++++++++++++++++++++----
 2 files changed, 29 insertions(+), 4 deletions(-)

diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 6232d2bbb..93116e987 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -38,6 +38,7 @@ jobs:
       - name: go build
         run: |
           go build -tags=example -v ./...
+          env GOOS=js GOARCH=wasm go build -tags=example -v ./...
           env GOOS=windows GOARCH=amd64 go build -tags=example -v ./...
           env GOOS=windows GOARCH=386 go build -tags=example -v ./...
 
@@ -73,6 +74,7 @@ jobs:
       - name: go build
         run: |
           go build -tags=example -v ./...
+          env GOOS=js GOARCH=wasm go build -tags=example -v ./...
           env GOOS=windows GOARCH=amd64 go build -tags=example -v ./...
           env GOOS=windows GOARCH=386 go build -tags=example -v ./...
 
@@ -113,6 +115,7 @@ jobs:
       - name: go build
         run: |
           go build -tags=example -v ./...
+          env GOOS=js GOARCH=wasm go build -tags=example -v ./...
 
       - name: go test
         run: |
diff --git a/image_test.go b/image_test.go
index 1a8363628..0be73fd53 100644
--- a/image_test.go
+++ b/image_test.go
@@ -22,7 +22,9 @@ import (
 	"image/draw"
 	_ "image/png"
 	"math"
+	"regexp"
 	"runtime"
+	"strconv"
 	"testing"
 
 	. "github.com/hajimehoshi/ebiten"
@@ -32,6 +34,28 @@ import (
 	"github.com/hajimehoshi/ebiten/internal/web"
 )
 
+func skipTooSlowTests(t *testing.T) bool {
+	if web.IsGopherJS() {
+		t.Skip("too slow on GopherJS")
+		return true
+	}
+	if runtime.GOOS == "js" {
+		v := runtime.Version()
+		if m := regexp.MustCompile(`^go(\d+)\.(\d+)$`).FindStringSubmatch(v); m != nil {
+			major, _ := strconv.Atoi(m[1])
+			minor, _ := strconv.Atoi(m[2])
+
+			// In Go1.12, converting JS arrays from/to slices uses TypedArrayOf, and this might allocates
+			// too many ArrayBuffers.
+			if major == 1 && minor <= 12 {
+				t.Skip(fmt.Sprintf("too slow on Go%d.%dWasm", major, minor))
+				return true
+			}
+		}
+	}
+	return false
+}
+
 func TestMain(m *testing.M) {
 	t.MainWithRunLoop(m)
 }
@@ -545,8 +569,7 @@ func TestImageClear(t *testing.T) {
 func TestImageEdge(t *testing.T) {
 	// TODO: This test is not so meaningful after #1218. Do we remove this?
 
-	if web.IsGopherJS() {
-		t.Skip("too slow on GopherJS")
+	if skipTooSlowTests(t) {
 		return
 	}
 
@@ -899,8 +922,7 @@ func TestImageCopy(t *testing.T) {
 
 // Issue #611, #907
 func TestImageStretch(t *testing.T) {
-	if web.IsGopherJS() {
-		t.Skip("too slow on GopherJS")
+	if skipTooSlowTests(t) {
 		return
 	}