test/utils: support RegEx in HeliosTest.fails

package.json

@@ -16,7 +16,9 @@
         "test:pretty": "prettier . --check",
         "test:suite": "node --stack-trace-limit=50 --test",
         "test:types": "tsc -p jsconfig.json --noEmit",
-        "test:version": "node -e \"import('./src/index.js').then(m => {if (m.VERSION != process.env.npm_package_version) {throw new Error(\\\"version mismatch\\\")}})\""
+        "test:version": "node -e \"import('./src/index.js').then(m => {if (m.VERSION != process.env.npm_package_version) {throw new Error(\\\"version mismatch\\\")}})\"",
+        "testing": "node --stack-trace-limit=50 --test --watch",
+        "testing:debug": "node --inspect-brk --stack-trace-limit=50 --test-concurrency=1 --test --watch"
     },
     "repository": {
         "type": "git",

test/utils.js

@@ -29,6 +29,7 @@ import { Program } from "../src/program/Program.js"
  *   modules?: string[]
  *   inputs: UplcData[]
  *   output: HeliosTestOutput
+ *    fails?: boolean | RegExp
  * }} HeliosTest
  */
 
@@ -54,13 +55,27 @@ export function compileAndRunMany(testVector) {
  */
 export function compileAndRun(test) {
     it(test.description, () => {
-        const program = new Program(test.main, {
-            moduleSources: test.modules,
-            isTestnet: true
-        })
-
-        const uplc0 = program.compile(false)
+        const initialTest = () => {
+            const program = new Program(test.main, {
+                moduleSources: test.modules,
+                isTestnet: true
+            })
 
+            const uplc0 = program.compile(false)
+            return [program, uplc0]
+        }
+        if (true == test.fails) {
+            throws(initialTest)
+            return
+        } else if (test.fails) {
+            // console.log("checking for failure message", test.fails)
+            // NOTE: node's test library doesn't seem to correctly check for throwing with string input
+            // ... despite claiming to do so.  When it works, we can update the type of test.fails above 
+            // ... to include string.  Meanwhile, pass a RegExp to check for the error message.
+            throws(initialTest, test.fails)
+            return
+        }
+        const [program, uplc0] = initialTest()
         const args = test.inputs.map((d) => new UplcDataValue(d))
         const result0 = uplc0.eval(args)
 
@@ -227,8 +242,10 @@ export function evalTypes(test) {
             })
         }
 
-        if (test.fails) {
+        if (true == typeof test.fails) {
             throws(construct)
+        } else if (test.fails) {
+            throws(construct, test.fails)
         } else {
             construct()
         }