Like software developers create a software architecture describing how to software is built from a very high level perspective, you can do the same from a testing point of view.
In my cases (involving software testing), the test architecture contains many elements which are also present in the software architecture diagram.
It differs from the software ...
Test Architecture Design
Determine what to do in each of the 4 agile testing quadrants:
Determine how to structure your test pyramid (representing the volume of tests) with more unit tests on the bottom and less exploratory testing at the top
Lots of Unit Tests
How about an code review from an experienced senior developer, so that you can focus more on practical tips.
Experience is incomparable to any tool at least in the current state of the tools.
Other possible ways
If coding guidelines and standard followed.
Coding guidelines followed.
Design principle effectiveness .
Most of this comes from Wikipedia and these lecture notes.
Wikipedia defines a fixed point this way:
In mathematics, a fixed point [...] of a function is an element of the function's domain that is mapped to itself by the function. [...] That is to say, c is a fixed point of the function f(x) if and only if f(c) = c.
For example, for the function f(x) = ...