Expand Gotlin language and tooling

internal/lang/go_interop_test.go

@@ -0,0 +1,32 @@
+package lang
+
+import (
+	"strings"
+	"testing"
+)
+
+func TestGenerateGoLowercaseImportedSelectors(t *testing.T) {
+	prog, err := Parse(`
+package demo
+
+import http net.http
+import json encoding.json
+
+fun main() {
+    http.handleFunc("/health", handler)
+    json.unmarshal(body, &target)
+}
+`)
+	if err != nil {
+		t.Fatalf("parse failed: %v", err)
+	}
+	out, err := GenerateGo(prog)
+	if err != nil {
+		t.Fatalf("generation failed: %v", err)
+	}
+	for _, want := range []string{"http.HandleFunc(\"/health\", handler)", "json.Unmarshal(body, &target)"} {
+		if !strings.Contains(string(out), want) {
+			t.Fatalf("generated Go missing %q:\n%s", want, out)
+		}
+	}
+}