Can someone help me fill in these jUnit Test cases and explain them too please?

Unit being tested	Rule / requirement being tested	Setup work required	Test value	Expected result(s) (all must be verified via appropriate JUnit assert() invocations
getCapacity()	returns storage capacity
getSpacesRemaining()	returns number of available storage spaces
reset()	sets collection to an empty state
isFull()	determines if there is any remaining storage capacity
isEmpty()	determines if the collection is empty
getStudentCount()	returns number of elements in collection
retrieveStudentBySID()	retrieves a student from collection based on supplied SID value
removeStudentBySID()	removes a student from collection based on supplied SID value
toString()	"stringifies" each collection element and concatenates the results into a single string	create a collection of size 4	n/a	returned string == "empty collection"
	"	create a collection of size 4, create two student objects S1 and S2, adding each to the collection	n/a	returned string == S1 + "&" + S2
writeCollectionToDisk()	write contents of collection to a specified file such that the contents can be read back at a later date	NOTE: it is not possible to verify writeCollectionToDisk() without invoking readCollectionFromDisk(), because without reading back what was written, there is no empirical evidence that what was written was written correctly. Similarly, readCollectionFromDisk() cannot be verified without first invoking writeCollectionToDisk(), because one must first write something to disk before it can be read.
	filename cannot be null	none	null	throws IllegalArgumentException
	filename cannot be an empty string	none	(empty string)	throws IllegalArgumentException
	write contents of collection to a specified file such that the contents can be read back at a later date	create two students with different SIDs; create a reference collection (size 5) and a checklist collection (size 5); store the both students into both collections; invoke writeCollectionToDisk via the REFERENCE collection	valid filename	no exception thrown; fileExists(filename) == TRUE; create a retrieved collection (size 10); invoke retrieveCollectionFromDisk() via the RETRIEVED collection, no thrown exception; create an iterator via the RETRIEVED collection; loop through the iterator object: student = handle.next(); remove student from the checklist collection (if student is removed, increment count) end loop; referenceCollection.getStudentCount() == retrievedCollection.getStudentCount(); checkListCollection.getStudentCount() == 0; count = retrievedCollection.getStudentCount();
readCollectionFromDisk()	read contents of a collection that was previously written to disk	NOTE: it is not possible to verify readCollectionFromDis() without invoking writeCollectionToDisk(), because one must first write something to disk before it can be read. Similarly, readCollectionFromDisk() cannot be verified without first invoking writeCollectionToDisk(), because without reading back what was written there is no empirical evidence that what was written was written correctly and retrieved correctly.
	filename cannot be null	none	null	throws IllegalArgumentException
	filename cannot be an empty string	none	(empty string)	throws IllegalArgumentException
	filename must exist	none	valid filename that does not exist	throws StudentCollectionException
	filename exists but does not contain serialized content	create a file with non-serialized content (e.g. .docx, .pdf, .jpg)	valid filename	throws StudentCollectionException
	filename exists but contains serialized content of a different class	Create a file with serialized content from any class other than StudentCollection	valid filename	throws StudentCollectionException
	filename exists, contains serialized content of this class, but SVUID is different	Create a file with serialized content from a StudentCollection class version with a SVUID that differs from the current SVUID	valid filename	throws StudentCollectionException
	write contents of collection to a specified file such that the contents can be read back at a later date	create two students with different SIDs; create a reference collection (size 5) and a checklist collection (size 5); store the both students into both collections; invoke writeCollectionToDisk via the REFERENCE collection	valid filename	no exception thrown; fileExists(filename) == TRUE; create a retrieved collection (size 10); invoke retrieveCollectionFromDisk() via the RETRIEVED collection, no thrown exception; create an iterator via the RETRIEVED collection; loop through the iterator object: student = handle.next(); remove student from the checklist collection (if student is removed, increment count) end loop; referenceCollection.getStudentCount() == retrievedCollection.getStudentCount(); checkListCollection.getStudentCount() == 0; count = retrievedCollection.getStudentCount();

void reset ) empty the collection ("throw away" the current contents) void retrieveCollectionFromDisk(java.lang.String sourcerileName) reads the contents of the supplied file into a StudentCollectionSpec-type object; the file must have been previously written via Serializable method(s). retrieveStudentBySID(java.lang.String searchKey) find a student object with an SID that matches the supplied SID; the Student is NOT removed from the collection StudentSpec java.lang.String toString () return the contents of the collection, represented as a single String void writecollectionToDisk (java.lang.String targetFileName) writes the contents of this StudentCollectionSpec object to the supplied file. Methods inherited from class java.lang.Object clone, equals, finalize, getclass, hashCode, notify, notifyAll, wait, wait, wait Methods inherited from interface studentcollection.StudentCollectionSpec fileExists Static Methods Instance Methods Concrete Methods All Methods Modifier and Type void Method and Description addStudent (StudentSpec anElement) add a student to the collection java.util.Iterator