Github user ToivoAdams commented on a diff in the pull request:

    https://github.com/apache/nifi/pull/803#discussion_r79117053
  
    --- Diff: nifi-mock/src/main/java/org/apache/nifi/util/MockFlowFile.java ---
    @@ -290,4 +291,18 @@ public long getLineageStartIndex() {
         public long getQueueDateIndex() {
             return 0;
         }
    +
    +    public boolean isAttributeEqual(final String attributeName, final 
String expectedValue) {
    +        // unknown attribute name, so cannot be equal.
    +        if (attributes.containsKey(attributeName) == false)
    +            return false;
    +
    +        String value = attributes.get(attributeName);
    +        return Objects.equals(expectedValue, value);
    +    }
    +
    +    public boolean isContentEqual(String excpected) {
    +        final String value = new String(this.data, 
Charset.forName("UTF-8"));
    +        return Objects.equals(excpected, value);
    --- End diff --
    
    Hi @JPercivall,
    
    Thanks for reviewing.
    
    Maybe I misunderstood, but assertContentEquals methods don’t return 
boolean and won’t work with Predicate’s.
    
    For example, I can’t use assertContentEquals here (instead of 
isContentEqual)
    ```java
            runner.assertAllConditionsMet("success",
                mff -> mff.isAttributeEqual("GROUP_ATTRIBUTE_KEY", "1") && 
mff.isContentEqual("1,hello\n1,good-bye")
            );
    ```
    
    isContentEqual parameter could be byte[] array.
    But I think its convenient to have String parameter also, maybe 2 
overloaded methods?
    
    Thanks
    Toivo


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