refactor: extract temp so we can show the computation being tested clearly.

Author: hemalvarambhia

src/Math-Tests-Polynomials/PMPolynomialTest.class.st

@@ -294,9 +294,11 @@ PMPolynomialTest >> testPolynomialRootsForLinear [
 
 { #category : #'testing - subtraction' }
 PMPolynomialTest >> testPolynomialSubtraction [
-	| polynomial |
-	polynomial := (PMPolynomial coefficients: #(2 -3 1))
-		- (PMPolynomial coefficients: #(-3 7 2 1)).
+
+	| polynomial p q |
+	p := PMPolynomial coefficients: #( 2 -3 1 ).
+	q := PMPolynomial coefficients: #( -3 7 2 1 ).
+	polynomial := p - q.
 	self assert: (polynomial at: 0) equals: 5.
 	self assert: (polynomial at: 1) equals: -10.
 	self assert: (polynomial at: 2) equals: -1.