The first and simplest test is to check that a document has the same number of form fields as the master document:

<testcase name="haveSameNumberOfFields">
  <assertThat testDocument="test/test.pdf"
              masterDocument="master/master.pdf"
  >
    <haveSameNumberOfFields />
  </assertThat>
</testcase>

The next test checks that the number of fields and their names are equal in both PDF documents:

<testcase name="haveSameFields_ByName">
  <assertThat testDocument="test/test.pdf"
              masterDocument="master/master.pdf"
  >
    <haveSameFields by="NAME" />
  </assertThat>
</testcase>

If you want to compare the fields of two documents including all properties you have to use the tag <haveSameFields /> with the attribute by="PROPERTIES":

<testcase name="haveSameFields_ByProperties">
  <assertThat testDocument="test/test.pdf"
              masterDocument="master/master.pdf"
  >
    <haveSameFields by="PROPERTIES" />
  </assertThat>
</testcase>

All field properties can be extracted into an XML file using the utility program ExtractFieldsInfo, see chapter 9.3: “Extract Field Information to XML”. This file can be analyzed later.

And finally you can compare the content of form fields of two documents using the tag <haveSameFields /> and the attribute by="VALUE". The test fails when a field have different contents in the two files:

<testcase name="haveSameFields_ByValues">
  <assertThat testDocument="test/test.pdf"
              masterDocument="master/master.pdf"
  >
    <haveSameFields by="VALUE" /> 
  </assertThat>
</testcase>

You can compare fields and other parts of two PDF documents in one test, but such a test is not recommended because it's hard to find a good name:

<testcase name="compareManyItems">
  <assertThat testDocument="test/test.pdf"
              masterDocument="master/master.pdf"
  >
    <haveSameFields by="PROPERTIES" />
    <haveSameFields by="VALUE"      />
    <haveSameFonts  />
    <haveSameTitle  />
    <haveSameAuthor />
  </assertThat>
</testcase>