miasya / COMP251_A3_TestCases

A few tests to test your COMP251 Assignment3.

COMP 251 - Assignment 3 Test Cases

IMPORTANT

• Even though we tried making the most appropriate testcases for this assignment, there still may be some errors in them, do not hesitate to point them out.

• Having everything right in the following tests does not mean in any way that you will obtain 100% on the assignment.

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Contribute

You are more than welcome to fork this repository and add more test cases.

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To do's

Question 1

[ ] Add tester file for pathDFS

[X] CLRS p. 728 : transcribe worst case scenario for FF

[X] Internet : Find examples of max-flow (bigger graphs)

Question 2

[x] Basic test cases for Question 2 : Bellman-Ford

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Question 1 : Ford-Fulkerson

Running tests

You must pass FFTest i .txt as argument to FordFulkerson.java to run the tests, where i is the number of the test.

For example, to run the first example you should do the following :

$ javac FordFulkerson.java
$ java FordFulkerson FFTest1.txt

Alternatively, run the tester file tester.py with all java source files in the same directory as the tester.

Sample output should look like:

1
0 5
6
0 1 1
1 2 1
2 3 1
3 4 1
4 5 1

The result should match FFRes i .txt, where i is the number of the test. For example if you run java FordFulkerson FFTest1.txt , your output should be exactly the contents of FFRes1.txt.

Note : All test files are located in the FordFulkerson folder.

Precisions on Graphs

Graph	Purpose of test
FFTest1	Trivial path from s to t (one iteration)
FFTest2	No path from s -> t
FFTest3	Same file as ff2.txt (provided by instructor)
FFTest4	Same graph as FFTest3, but source is 5, target is 0 (no path)
FFTest5	Multiple solutions (Res5-1 / Res5-2)
FFTest6	Possible worst case for the algorithm (CLRS p.728)

Examples of bigger max-flow graphs

These graphs can become computationally intensive really quickly. The paper referenced can be found here: https://ctlab.itmo.ru/~mbuzdalov/papers/cec15-flows.pdf

A max-flow graph generator can be found in the FordFulkerson folder. It must be compiled with the WGraph file provided by the instructors. Usage in the command line is as follows: java MaxFlowGraphGenerator n maxWeight. The resulting graph will have 6n nodes and any the weight of any edge will be smaller or equal to maxWeight.

A few tests can be found in the folder ZadehTests.

Graph	Purpose of test
zTest1	Number of nodes = 90
zTest2	Number of nodes = 150
zTest3	Number of nodes = 210
zTest4	Number of nodes = 300

Question 2 : Bellman-Ford

Running tests

You must pass bfTest i .txt as argument to BellmanFord.java to run the tests, where i is the number of the test.

For example, to run the first example you should do the following :

$ javac BellmanFord.java
$ java BellmanFord bfTest1.txt

Alternatively, run the tester file tester.py with all java source files in the same directory as the tester.

Precisions on Graphs

CLRS p.652:

Test	Purpose of test
bfTest1	Provided by instructor
bfTest2	CLRS to node t
bfTest3	Negative weight cycle
bfTest4	CLRS to node z
bfTest5	BellmanFord runs, but path does not exist
bfTest6	Single straight line path
bfTest7	Finds path where source = destination

Auto tester

• Requires Python 3.6+
• Clone the repo and put all .java source files from the assignment into the directory
• Run python3 tester.py. It runs your program on all files in the tests folders and compares the output to the files in the res folders.
• It only checks for an output identical to the expected result, not for program correctness.
• Pass v as a command line argument to tester.py to see more detailed results, including the expected output if a test case failed.

Example output from tester:

Testing FordFulkerson:
--------------------------------------------
Test FFRes1.txt:        Pass
Test FFRes2.txt:        Pass
Test FFRes3.txt:        Pass
Test FFRes4.txt:        Pass
Test FFRes5.txt:        Pass
Test FFRes6.txt:        Pass

Testing BellmanFord:
--------------------------------------------
Test bfRes1.txt:        Pass
Test bfRes2.txt:        Pass
Test bfRes3.txt:        Pass
Test bfRes4.txt:        Pass
Test bfRes5.txt:        Pass
Test bfRes6.txt:        Pass
Test bfRes7.txt:        Pass

Final Results:
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FordFulkerson:6/6
BellmanFord:7/7