Working WASM Fetch test case

Makefile

@@ -36,6 +36,9 @@ fetch: clean
 	cp $$(go env GOROOT)/misc/wasm/wasm_exec.js ./html/wasm_exec.js
 	sed -i -e 's;</button>;</button>\n\t<div id=\"target\"></div>;' ./html/index.html
 
+test: clean
+	GOOS=js GOARCH=wasm go test -c -o ./html/test.wasm ./test/
+
 clean:
 	rm -f ./html/*
 

test/fetch_test.go

@@ -0,0 +1,42 @@
+package fetch_test
+
+import (
+	"encoding/json"
+	"net/http"
+	"testing"
+)
+
+type jsonResp struct {
+	Headers struct {
+		Accept         string `json:"Accept"`
+		AcceptEncoding string `json:"Accept-Encoding"`
+		Host           string `json:"Host"`
+		Origin         string `json:"Origin"`
+		Referer        string `json:"Referer"`
+		UserAgent      string `json:"User-Agent"`
+	} `json:"headers"`
+	Origin string `json:"origin"`
+	URL    string `json:"url"`
+}
+
+func TestFetch(t *testing.T) {
+	resp, err := http.Get("https://httpbin.org/get")
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer resp.Body.Close()
+
+	if resp.StatusCode != http.StatusOK {
+		t.Fatalf("Unexpected StatusCode %d", resp.StatusCode)
+	}
+
+	var r jsonResp
+	err = json.NewDecoder(resp.Body).Decode(&r)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	if r.URL != "https://httpbin.org/get" {
+		t.Errorf("Unexpected request URL: %q", r.URL)
+	}
+}

test/wasm_test.go

@@ -1,30 +0,0 @@
-//+build js,wasm
-
-package wasm_test
-
-import (
-	"io/ioutil"
-	"net/http"
-	"testing"
-)
-
-func TestFetch(t *testing.T) {
-	resp, err := http.Get("http://example.com/")
-	if err != nil {
-		t.Fatal(err)
-	}
-	defer resp.Body.Close()
-
-	if resp.StatusCode != http.StatusOK {
-		t.Errorf("Unexpected StatusCode %d", resp.StatusCode)
-	}
-
-	rb, err := ioutil.ReadAll(resp.Body)
-	if err != nil {
-		t.Fatal(err)
-	}
-
-	if string(rb) != "stuff" {
-		t.Errorf("Unexpected Body: %q", string(rb))
-	}
-}