Add a small deployment model

Open the existing file that currently runs the path simulator. Keep its surrounding project structure and syntax. Replace or extend its sample data with a small collection of deployments, each containing its own paths.

Use this shape as a guide, but type the values and syntax in the style already used by the project:

deployments = {
  "deployment-a": {
    paths: [ /* several exact paths */ ]
  },
  "deployment-b": {
    paths: [ /* at least one path different from deployment-a */ ]
  }
}

deployments = {
  "deployment-a": {
    paths: [ /* several exact paths */ ]
  },
  "deployment-b": {
    paths: [ /* at least one path different from deployment-a */ ]
  }
}

Choose a few paths that make the distinction visible. For example, include a stored /docs path, but do not include /docs/getting-started unless you want that second path to exist too.

Now complete the lookup function:

function lookup(deploymentId, requestedPath) {
  deployment = deployments[deploymentId]

  if deployment does not exist:
    return a 404 result

  if requestedPath is an exact member of deployment.paths:
    return a 200 result containing the deployment and requested path

  return a 404 result
}

function lookup(deploymentId, requestedPath) {
  deployment = deployments[deploymentId]

  if deployment does not exist:
    return a 404 result

  if requestedPath is an exact member of deployment.paths:
    return a 200 result containing the deployment and requested path

  return a 404 result
}

The important choice is the membership test. Do not use a substring test or a “starts with” test. The lookup should compare the requested path as one complete value.

If the project already represents paths with a set-like collection, use its exact membership operation. If it currently uses an array, use the project’s established way of checking whether one value is present. Do not normalize, trim, or rewrite the path yet; this first version should make the baseline rule easy to see.

Make the check visible

Find the existing simulator check, test block, or command that prints lookup results. Add cases for:

1. a path present in deployment-a;
2. a path absent from deployment-a;
3. a path that merely begins with a present path;
4. a path present in deployment-a but absent from deployment-b.

Leave the expected result beside each case so the output is easy to inspect. In outline:

check(
  lookup("deployment-a", "an existing exact path"),
  expected status: 200
)

check(
  lookup("deployment-a", "a missing path"),
  expected status: 404
)

check(
  lookup("deployment-a", "the existing path plus another segment"),
  expected status: 404
)

check(
  lookup("deployment-b", "a path belonging only to deployment-a"),
  expected status: 404
)

check(
  lookup("deployment-a", "an existing exact path"),
  expected status: 200
)

check(
  lookup("deployment-a", "a missing path"),
  expected status: 404
)

check(
  lookup("deployment-a", "the existing path plus another segment"),
  expected status: 404
)

check(
  lookup("deployment-b", "a path belonging only to deployment-a"),
  expected status: 404
)

Run the project with its documented command. The useful output is not merely that the program runs; it should show a clear difference between the four cases.

If the prefix case returns 200, inspect the condition in lookup. It is probably answering “does this request resemble a stored path?” rather than “is this complete path stored?” Change that condition before continuing.