add tests

Author: jClugstor

test/verbosity.jl

@@ -0,0 +1,27 @@
+using LinearSolve
+using LinearSolve: LinearVerbosity
+using SciMLLogging: SciMLLogging, Verbosity
+using Test
+
+A = [1.0 0 0 0
+     0 1 0 0
+     0 0 1 0
+     0 0 0 0]
+b = rand(4)
+prob = LinearProblem(A, b)
+
+@test_logs (:warn,
+    "LU factorization failed, falling back to QR factorization. `A` is potentially rank-deficient.") solve(
+    prob,
+    verbose = LinearVerbosity(default_lu_fallback = Verbosity.Warn()))
+
+@test_logs (:warn,
+    "LU factorization failed, falling back to QR factorization. `A` is potentially rank-deficient.") solve(
+    prob, verbose = true)
+
+@test_logs min_level=SciMLLogging.Logging.Warn solve(prob, verbose = false)
+
+@test_logs (:info,
+    "LU factorization failed, falling back to QR factorization. `A` is potentially rank-deficient.") solve(
+    prob,
+    verbose = LinearVerbosity(default_lu_fallback = Verbosity.Info()))