private StructureDataType createStruct(String name, DataType contentType, int count) {
		StructureDataType struct = new StructureDataType(name, 0, dtm);
		for (int i = 0; i < count; i++) {
			struct.add(contentType);
		}
		return struct;
	}
Tests for manipulating data types in the category/data type tree.
Ghidra/Features/Base/src/test.slow/java/ghidra/program/model/data/DataTypeTest.java