acvp: fix tests

It happened that it used to be possible to run `acvptool` with `-json`
and not need a config file. That stopped working as of 02397c7c97 but
the test runner needs to be updated accordingly.

Change-Id: I54cf0fc7420d18749e93c3d85201ba24d0a59e15
Reviewed-on: https://boringssl-review.googlesource.com/c/boringssl/+/57465
Commit-Queue: Adam Langley <agl@google.com>
Auto-Submit: Adam Langley <agl@google.com>
Reviewed-by: David Benjamin <davidben@google.com>

util/fipstools/acvp/acvptool/test/check_expected.go

diff --git a/util/fipstools/acvp/acvptool/test/check_expected.go b/util/fipstools/acvp/acvptool/test/check_expected.go
index ccc8038..2f6c5d9 100644
--- a/util/fipstools/acvp/acvptool/test/check_expected.go
+++ b/util/fipstools/acvp/acvptool/test/check_expected.go
@@ -42,6 +42,7 @@
 	wrapperPath  string
 	inPath       string
 	expectedPath string
+	configPath   string
 }
 
 func main() {
@@ -85,6 +86,15 @@
 		log.Fatal(err)
 	}
 
+	configFile, err := os.CreateTemp("", "boringssl-check_expected-config-")
+	if err != nil {
+		log.Fatalf("Failed to create temp file for config: %s", err)
+	}
+	defer os.Remove(configFile.Name())
+	if _, err := configFile.WriteString("{}\n"); err != nil {
+		log.Fatalf("Failed to write config file: %s", err)
+	}
+
 	work := make(chan invocation, runtime.NumCPU())
 	var numFailed uint32
 
@@ -104,6 +114,7 @@
 			wrapperPath:  wrapper,
 			inPath:       test.In,
 			expectedPath: test.Out,
+			configPath:   configFile.Name(),
 		}
 	}
 
@@ -149,7 +160,7 @@
 		return fmt.Errorf("Failed to decompress %q: %s", test.inPath, err)
 	}
 
-	cmd := exec.Command(test.toolPath, "-wrapper", test.wrapperPath, "-json", tempFile.Name())
+	cmd := exec.Command(test.toolPath, "-wrapper", test.wrapperPath, "-json", tempFile.Name(), "-config", test.configPath)
 	result, err := cmd.CombinedOutput()
 	if err != nil {
 		os.Stderr.Write(result)