spring-auth-demo/refresh-tokens/src/test/java/com/ankurm/refresh/Transcript.java

package com.ankurm.refresh;

import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Path;

/** Collects lines and writes them to {@code output/<name>.txt} (relative to the module directory). */
final class Transcript {

    private final String name;
    private final StringBuilder text = new StringBuilder();

    Transcript(String name) {
        this.name = name;
    }

    Transcript line(String format, Object... args) {
        text.append(args.length == 0 ? format : String.format(format, args)).append('\n');
        return this;
    }

    void write() throws IOException {
        Path dir = Path.of("output");
        Files.createDirectories(dir);
        Files.writeString(dir.resolve(name + ".txt"), text.toString());
    }
}