test(compiler-cli): expand logging when extra compliance check fails (#39863)

Previously this would have just printed that `false` was not equal to
`true`, which, although true, is not very helpful. This commit adds
details about which special check failed together with the generated
code, for easier debugging.

PR Close #39863

packages/compiler-cli/test/compliance/test_helpers/check_expectations.ts

@@ -79,6 +79,10 @@ function runExtraChecks(
           `Unknown extra-check function: "${fnName}" in ${testPath}.\n` +
           `Possible choices are: ${Object.keys(EXTRA_CHECK_FUNCTIONS).map(f => `\n - ${f}`)}.`);
     }
-    expect(fn(generated, ...args)).toBe(true);
+    if (!fn(generated, ...args)) {
+      throw new Error(
+          `Extra check ${fnName}(${args.map(arg => JSON.stringify(arg)).join(',')}) in ${
+              testPath} failed for generated code:\n\n${generated}`);
+    }
   }
 }