Remove casings from the sausage and slice the sausage into small pieces.
In a large skillet, heat 1 tablespoon of olive oil and add sausage. Cook, occasionally stirring, until it's cooked through, drain the fat. Add another tablespoon of olive oil into the skillet with sausage, add chopped onion and garlic, half of the Cajun seasoning - cook, constantly stirring, on high heat until onion softens.
Add chopped bell peppers, tomatoes, mushrooms, and the remaining half of Cajun seasoning to the skillet with sausage. Cook for about 2 minutes, constantly stirring, on medium-high heat to sear the vegetables nicely on stove-top.
Add wine to the skillet, bring to boil, reduce to simmer and simmer, covered, occasionally stirring, for about 5-7 minutes. The liquid should reduce somewhat but not completely. Remove from heat. Salt to taste. Add more Cajun seasoning, if necessary.
Cook pasta al dente according to package instructions. Drain and immediately add to the skillet with the sauce. Mix everything well, cover, and heat the pasta on low heat for 1-2 minutes.
To serve, sprinkle with grated Parmesan cheese and black pepper.