Add worker-style variant of the tests added in [ae24ac0f7dd9], but building this with wasmfs causes them to throw inexplicable exceptions from the Emscripten glue (without wasmfs it builds and runs fine, but storage is not persistent).

FossilOrigin-Name: 6401595e59179c5c0f6e51c5362cf4391787e7a55b9c6ca655746e30d3251f2b

ext/wasm/api/scratchpad-opfs-worker.js

@@ -0,0 +1,86 @@
+/*
+  2022-05-22
+
+  The author disclaims copyright to this source code.  In place of a
+  legal notice, here is a blessing:
+
+  *   May you do good and not evil.
+  *   May you find forgiveness for yourself and forgive others.
+  *   May you share freely, never taking more than you give.
+
+  ***********************************************************************
+
+  An experiment for wasmfs/opfs. This file MUST be in the same dir as
+  the sqlite3.js emscripten module or that module won't be able to
+  resolve the relative URIs (importScript()'s relative URI handling
+  is, quite frankly, broken).
+*/
+'use strict';
+(function(){
+  const toss = function(...args){throw new Error(args.join(' '))};
+  importScripts('sqlite3.js');
+
+  /**
+     Posts a message in the form {type,data} unless passed more than 2
+     args, in which case it posts {type, data:[arg1...argN]}.
+  */
+  const wMsg = function(type,data){
+    postMessage({
+      type,
+      data: arguments.length<3
+        ? data
+        : Array.prototype.slice.call(arguments,1)
+    });
+  };
+
+  const stdout = console.log.bind(console);
+  const stderr = function(...args){wMsg('stderr', args);};
+
+  const test1 = function(db){
+    db.execMulti("create table if not exists t(a);")
+      .callInTransaction(function(db){
+        db.prepare("insert into t(a) values(?)")
+          .bind(new Date().getTime())
+          .stepFinalize();
+        stdout("Number of values in table t:",
+            db.selectValue("select count(*) from t"));
+      });
+  };
+
+  const runTests = function(Module){
+    //stdout("Module",Module);
+    self._MODULE = Module /* this is only to facilitate testing from the console */;
+    const sqlite3 = Module.sqlite3,
+          capi = sqlite3.capi,
+          oo = sqlite3.oo1,
+          wasm = capi.wasm;
+    stdout("Loaded sqlite3:",capi.sqlite3_libversion(), capi.sqlite3_sourceid());
+    const persistentDir = capi.sqlite3_web_persistent_dir();
+    if(persistentDir){
+      stderr("Persistent storage dir:",persistentDir);
+    }else{
+      stderr("No persistent storage available.");
+    }
+    const startTime = performance.now();
+    let db;
+    try {
+      db = new oo.DB(persistentDir+'/foo.db');
+      stdout("DB filename:",db.filename,db.fileName());
+      const banner1 = '>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>',
+            banner2 = '<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<';
+      [
+        test1
+      ].forEach((f)=>{
+        const n = performance.now();
+        stdout(banner1,"Running",f.name+"()...");
+        f(db, sqlite3, Module);
+        stdout(banner2,f.name+"() took ",(performance.now() - n),"ms");
+      });
+    }finally{
+      if(db) db.close();
+    }
+    stdout("Total test time:",(performance.now() - startTime),"ms");
+  };
+
+  sqlite3InitModule(self.sqlite3TestModule).then(runTests);
+})();