Bug: The order of the arguments in the starting function definition is x1, x2, y1, y2, whereas the the order in the test cases is x1, y1, x2, y2.
Technically, this problem is actually requesting the number of unique intersections minus one. For instance in the first case of the test suite, the line crosses the point (5,3) which is shared by four squares, but we count only two, which is the expected behaviour when crossing an edge, but not a vertex: https://imgur.com/a/wCQ6SNG
Make a Palindrome Number
Angle between two vectors
Back to basics 21 - Matrix replicating
Fill a zeros matrix
Sum the numbers on the main diagonal
Slicing the cube
Speed of light:Experiment
Which way to go?
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