test: Grep for failures in CI (#6339)

This change adjusts the CI tests to make it easier to spot errors, without needing to sift through the thousands of lines of output.

.github/workflows/reusable-build-test-config.yml

@@ -229,8 +229,21 @@ jobs:
         env:
           BUILD_NPROC: ${{ steps.nproc.outputs.nproc }}
         run: |
-          ./xrpld --unittest --unittest-jobs "${BUILD_NPROC}"
+          set -o pipefail
+          ./xrpld --unittest --unittest-jobs "${BUILD_NPROC}" 2>&1 | tee unittest.log
 
+      - name: Show test failure summary
+        if: ${{ failure() && !inputs.build_only }}
+        working-directory: ${{ runner.os == 'Windows' && format('{0}/{1}', env.BUILD_DIR, inputs.build_type) || env.BUILD_DIR }}
+        run: |
+          if [ ! -f unittest.log ]; then
+            echo "unittest.log not found; embedded tests may not have run."
+            exit 0
+          fi
+
+          if ! grep -E "failed" unittest.log; then
+            echo "Log present but no failure lines found in unittest.log."
+          fi
       - name: Debug failure (Linux)
         if: ${{ failure() && runner.os == 'Linux' && !inputs.build_only }}
         run: |

src/test/app/Vault_test.cpp

@@ -5340,20 +5340,20 @@ class Vault_test : public beast::unit_test::suite
             env.close();
 
             // 2. Mantissa larger than uint64 max
+            env.set_parse_failure_expected(true);
             try
             {
                 tx[sfAssetsMaximum] = "18446744073709551617e5";  // uint64 max + 1
                 env(tx, THISLINE);
-                BEAST_EXPECT(false);
+                BEAST_EXPECTS(false, "Expected parse_error for mantissa larger than uint64 max");
             }
             catch (parse_error const& e)
             {
                 using namespace std::string_literals;
                 BEAST_EXPECT(
-                    e.what() ==
-                    "invalidParamsField 'tx_json.AssetsMaximum' has invalid "
-                    "data."s);
+                    e.what() == "invalidParamsField 'tx_json.AssetsMaximum' has invalid data."s);
             }
+            env.set_parse_failure_expected(false);
         }
     }