add test

Author: dsherret

tests/helpers.ts

@@ -12,13 +12,28 @@ export * from "@deno/loader";
 export async function createLoader(
   workspaceOptions: WorkspaceOptions,
   loaderOptions: LoaderOptions,
+) {
+  const { loader, workspace, diagnostics } = await createLoaderWithDiagnostics(
+    workspaceOptions,
+    loaderOptions,
+  );
+  assertEquals(diagnostics, []);
+  return {
+    loader,
+    workspace,
+  };
+}
+
+export async function createLoaderWithDiagnostics(
+  workspaceOptions: WorkspaceOptions,
+  loaderOptions: LoaderOptions,
 ) {
   const workspace = new Workspace(workspaceOptions);
   const { loader, diagnostics } = await workspace.createLoader(loaderOptions);
-  assertEquals(diagnostics, []);
   return {
     loader,
     workspace,
+    diagnostics,
   };
 }
 

tests/invalid_graph/main.test.ts

@@ -0,0 +1,19 @@
+import { assertEquals } from "@std/assert";
+import { createLoaderWithDiagnostics } from "../helpers.ts";
+
+Deno.test("loads linked entrypoint", async () => {
+  const mainFile = import.meta.dirname + "/testdata/main.ts";
+  const { diagnostics } = await createLoaderWithDiagnostics({
+    configPath: import.meta.dirname + "/testdata/deno.json",
+  }, {
+    entrypoints: [mainFile],
+  });
+
+  assertEquals(diagnostics.length, 1);
+  const expectedMessage =
+    'Relative import path "unknown" not prefixed with / or ./ or ../';
+  assertEquals(
+    diagnostics[0].message.substring(0, expectedMessage.length),
+    expectedMessage,
+  );
+});

tests/invalid_graph/testdata/deno.json

@@ -0,0 +1,2 @@
+{
+}

tests/invalid_graph/testdata/main.ts

@@ -0,0 +1 @@
+import "unknown";