Get tests passing without engine connection (#155)

We can create a enginelessExecutor that can be used for many of the
executor tests that will be much more performant for tests that don't
need the engine to actually do any modeling work.

src/lang/queryAst.test.ts

@@ -7,7 +7,7 @@ import {
 } from './queryAst'
 import { lexer } from './tokeniser'
 import { initPromise } from './rust'
-import { executor } from '../lib/testHelpers'
+import { enginelessExecutor } from '../lib/testHelpers'
 import {
   createArrayExpression,
   createCallExpression,
@@ -38,7 +38,7 @@ const variableBelowShouldNotBeIncluded = 3
 show(part001)`
     const rangeStart = code.indexOf('// selection-range-7ish-before-this') - 7
     const ast = abstractSyntaxTree(lexer(code))
-    const programMemory = await executor(ast)
+    const programMemory = await enginelessExecutor(ast)
 
     const { variables, bodyPath, insertIndex } = findAllPreviousVariables(
       ast,