Mock Deno.exit() in the test to throw an error

This is required as Deno.exit(1) after `error()` is making `test.execute()` exit without possibility to cath the error and log the error to be verified.

Our test logic does not even fail on this Deno.exit() happening. Tests continue and nor OK or FAILED is thrown.

Our usual pattern to throw an error when using error(), but it may not apply in this case for checking version requirement in quarto.ts. This is why mocking is chosen here.

Author: cderv

tests/smoke/render/render-required.test.ts

@@ -18,6 +18,7 @@ testQuartoCmd(
 );
 
 let oldVersionRequirement: string | undefined;
+let originalDenoExit: typeof Deno.exit;
 
 testQuartoCmd(
   "render",
@@ -28,6 +29,12 @@ testQuartoCmd(
       // Save current version of QUARTO_VERSION_REQUIREMENT env var and set it to a value that will not be satisfied
       oldVersionRequirement = Deno.env.get("QUARTO_VERSION_REQUIREMENT");
       Deno.env.set("QUARTO_VERSION_REQUIREMENT", "< 0.0.0");
+      // Mock Deno.exit to throw an error instead of exiting
+      // Otherwise we would not check the error assertion
+      originalDenoExit = Deno.exit;
+      Deno.exit = (code?: number) => {
+        throw new Error(`Deno.exit called with code: ${code}`);
+      };
     },
     teardown: async () => {
       // Restore QUARTO_VERSION_REQUIREMENT
@@ -36,6 +43,8 @@ testQuartoCmd(
       } else {
         Deno.env.delete("QUARTO_VERSION_REQUIREMENT");
       }
+      // Restore Deno.exit
+      Deno.exit = originalDenoExit;
     },
   }
 );