test(ai-proxy): expand wasm integration tests, coverage, and provider matrix (#3790)

Signed-off-by: jingze <daijingze.djz@alibaba-inc.com>

plugins/wasm-go/extensions/ai-proxy/util/header_slice_test.go

@@ -0,0 +1,39 @@
+package util
+
+import (
+	"net/http"
+	"reflect"
+	"testing"
+)
+
+func TestCreateHeaders(t *testing.T) {
+	h := CreateHeaders("Content-Type", "application/json", ":status", "200")
+	if len(h) != 2 {
+		t.Fatalf("len=%d", len(h))
+	}
+	if h[0][0] != "Content-Type" || h[0][1] != "application/json" {
+		t.Fatalf("first pair: %v", h[0])
+	}
+}
+
+func TestHeaderToSliceAndSliceToHeader_roundTrip(t *testing.T) {
+	src := make(http.Header)
+	src.Set("A", "1")
+	src.Add("A", "2")
+	src.Set("B", "3")
+
+	slice := HeaderToSlice(src)
+	round := SliceToHeader(slice)
+
+	if !reflect.DeepEqual(src["A"], round["A"]) || !reflect.DeepEqual(src["B"], round["B"]) {
+		t.Fatalf("roundTrip mismatch: %#v vs %#v", src, round)
+	}
+}
+
+func TestOverwriteRequestPathHeader(t *testing.T) {
+	h := make(http.Header)
+	OverwriteRequestPathHeader(h, "/v1/chat/completions")
+	if h.Get(":path") != "/v1/chat/completions" {
+		t.Fatalf("path=%q", h.Get(":path"))
+	}
+}

plugins/wasm-go/extensions/ai-proxy/util/string_test.go

@@ -6,6 +6,33 @@ import (
 	"github.com/stretchr/testify/assert"
 )
 
+func TestMatchStatus(t *testing.T) {
+	defaultRetryPatterns := []string{"4.*", "5.*"}
+	tests := []struct {
+		name     string
+		status   string
+		patterns []string
+		want     bool
+	}{
+		{"200_no_match", "200", defaultRetryPatterns, false},
+		{"201_no_match", "201", defaultRetryPatterns, false},
+		{"429_matches_4xx", "429", defaultRetryPatterns, true},
+		{"400_matches_4xx", "400", defaultRetryPatterns, true},
+		{"503_matches_5xx", "503", defaultRetryPatterns, true},
+		{"500_matches_5xx", "500", defaultRetryPatterns, true},
+		{"exact_503_pattern", "503", []string{"503"}, true},
+		{"exact_503_miss", "502", []string{"503"}, false},
+		{"empty_patterns", "500", []string{}, false},
+		{"empty_status", "", defaultRetryPatterns, false},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			got := MatchStatus(tt.status, tt.patterns)
+			assert.Equal(t, tt.want, got)
+		})
+	}
+}
+
 func TestDecodeUnicodeEscapes(t *testing.T) {
 	tests := []struct {
 		name     string