diff --git a/src/component/particleSwarmOptimization/velocityUpdate.jl b/src/component/particleSwarmOptimization/velocityUpdate.jl
index 6089c8a..a2695db 100644
--- a/src/component/particleSwarmOptimization/velocityUpdate.jl
+++ b/src/component/particleSwarmOptimization/velocityUpdate.jl
@@ -47,8 +47,8 @@ struct ConstrainedVelocityUpdate <: VelocityUpdate
         deltaMax = Array{Float64}(undef, numberOfVariables(problem))
 
         for i in 1:numberOfVariables(problem)
-            bounds = bounds(problem)[i]
-            deltaMax[i] = (bounds.upperBound - bounds.lowerBound) / 2.0
+            problemBounds = bounds(problem)[i]
+            deltaMax[i] = (problemBounds.upperBound - problemBounds.lowerBound) / 2.0
             deltaMin[i] = -deltaMax[i]
         end
 
diff --git a/src/core/coreTypes.jl b/src/core/coreTypes.jl
index 06b488d..eef3555 100644
--- a/src/core/coreTypes.jl
+++ b/src/core/coreTypes.jl
@@ -13,6 +13,7 @@ abstract type Component end
 abstract type SolutionsCreation <: Component end
 abstract type Evaluation <: Component end
 abstract type Termination <: Component end
+
 abstract type Selection <: Component end
 abstract type Variation <: Component end
 abstract type Replacement <: Component end
diff --git a/src/problem/multiObjective/fonseca.jl b/src/problem/multiObjective/fonseca.jl
index 42978d7..f3def05 100644
--- a/src/problem/multiObjective/fonseca.jl
+++ b/src/problem/multiObjective/fonseca.jl
@@ -6,7 +6,6 @@ function fonseca()
     addVariable(problem, Bounds{Float64}(-4.0, 4.0))
   end
 
-
   f1 = x -> begin
     sum1 = 0.0
     for i in range(1, numberOfVariables)
diff --git a/test/component/particleSwarmOptimization/positionUpdateTest.jl b/test/component/particleSwarmOptimization/positionUpdateTest.jl
new file mode 100644
index 0000000..cac55c3
--- /dev/null
+++ b/test/component/particleSwarmOptimization/positionUpdateTest.jl
@@ -0,0 +1,53 @@
+# Unit tests for DefaultPositionUpdate
+
+function defaultPositionUpdateConstructorIsCorrectlyInitialized()
+    velocityChangeWhenLowerLimitIsReached = -1.0
+    velocityChangeWhenUpperLimitIsReached = 0.25
+    positionBounds = [Bounds{Float64}(1.0, 10.0)]
+
+    positionUpdate = DefaultPositionUpdate(velocityChangeWhenLowerLimitIsReached, velocityChangeWhenUpperLimitIsReached, positionBounds)
+
+    return velocityChangeWhenLowerLimitIsReached == positionUpdate.velocityChangeWhenLowerLimitIsReached && velocityChangeWhenUpperLimitIsReached == positionUpdate.velocityChangeWhenUpperLimitIsReached && positionBounds == positionUpdate.positionBounds
+end
+
+
+function positionUpdateWorksProperlyWithASingleParticle()
+    velocityChangeWhenLowerLimitIsReached = -1.0
+    velocityChangeWhenUpperLimitIsReached = 0.25
+    positionBounds = [Bounds{Float64}(-10.0, 10.0), Bounds{Float64}(-15.0, 15.0)]
+    speed = [[0.5, -0.5]]
+    variables = [2.0, 4.0]
+
+    particle = ContinuousSolution{Float64}(copy(variables), [1.5, 2.5], [], Dict(), positionBounds)
+    swarm = [particle]
+
+    positionUpdate = DefaultPositionUpdate(velocityChangeWhenLowerLimitIsReached, velocityChangeWhenUpperLimitIsReached, positionBounds)
+
+    update(positionUpdate, swarm, speed)
+
+    return speed[1] .+ variables == particle.variables
+end
+
+function positionUpdateWorksProperlyWithASingleParticleWithPositionsOutOfBounds()
+    velocityChangeWhenLowerLimitIsReached = -1.0
+    velocityChangeWhenUpperLimitIsReached = 1
+    positionBounds = [Bounds{Float64}(-10.0, 10.0), Bounds{Float64}(-15.0, 15.0)]
+    speed = [[-1.0, 1.0]]
+    variables = [-9.5, 14.5]
+
+    particle = ContinuousSolution{Float64}(copy(variables), [1.5, 2.5], [], Dict(), positionBounds)
+    swarm = [particle]
+
+    positionUpdate = DefaultPositionUpdate(velocityChangeWhenLowerLimitIsReached, velocityChangeWhenUpperLimitIsReached, positionBounds)
+
+    update(positionUpdate, swarm, speed)
+
+    return [-10.0, 15.0] == particle.variables
+end
+
+
+@testset "Default position update tests" begin    
+    @test defaultPositionUpdateConstructorIsCorrectlyInitialized()
+    @test positionUpdateWorksProperlyWithASingleParticle()
+    @test positionUpdateWorksProperlyWithASingleParticleWithPositionsOutOfBounds()
+end
diff --git a/test/component/particleSwarmOptimization/velocityUpdateTest.jl b/test/component/particleSwarmOptimization/velocityUpdateTest.jl
new file mode 100644
index 0000000..6c89b75
--- /dev/null
+++ b/test/component/particleSwarmOptimization/velocityUpdateTest.jl
@@ -0,0 +1,40 @@
+# Unit tests for DefaultVelocityUpdate
+
+function defaultVelocityUpdateIsCorrectlyInitialized()
+    c1Min = 0.1
+    c1Max = 0.5
+    c2Min = 0.2
+    c2Max = 0.6
+    
+    velocityUpdate = DefaultVelocityUpdate(c1Min, c1Max, c2Min, c2Max)
+
+    return c1Min == velocityUpdate.c1Min && c1Max == velocityUpdate.c1Max && c2Min == velocityUpdate.c2Min && c2Max == velocityUpdate.c2Max 
+end
+
+
+@testset "DefaultVelocityUpdate tests" begin    
+    @test defaultVelocityUpdateIsCorrectlyInitialized()
+end
+
+# Unit tests for ConstrainedVelocityUpdate
+
+function constrainedVelocityUpdateIsCorrectlyInitialized()
+    c1Min = 0.1
+    c1Max = 0.5
+    c2Min = 0.2
+    c2Max = 0.6
+    problem = fonseca()
+
+    velocityUpdate = ConstrainedVelocityUpdate(c1Min, c1Max, c2Min, c2Max, problem)
+    
+    # Bounds for the tree variables of problen Fonseca: [-4.0, 4.0]
+    deltaMax = [(4.0 - -4.0)/2.0 for _ in 1:3]
+    deltaMin = -deltaMax
+
+
+    return c1Min == velocityUpdate.c1Min && c1Max == velocityUpdate.c1Max && c2Min == velocityUpdate.c2Min && c2Max == velocityUpdate.c2Max && deltaMax == velocityUpdate.deltaMax && deltaMin == velocityUpdate.deltaMin
+end
+
+@testset "ConstrainedVelocityUpdate tests" begin    
+    @test constrainedVelocityUpdateIsCorrectlyInitialized()
+end
\ No newline at end of file
diff --git a/test/runtests.jl b/test/runtests.jl
index 85c3188..59328f7 100644
--- a/test/runtests.jl
+++ b/test/runtests.jl
@@ -36,7 +36,9 @@ componentTests = [
     "component/particleSwarmOptimization/globalBestUpdateTest.jl",
     "component/particleSwarmOptimization/localBestInitializationTest.jl",
     "component/particleSwarmOptimization/localBestUpdateTest.jl",
-    "component/particleSwarmOptimization/perturbationTest.jl"
+    "component/particleSwarmOptimization/perturbationTest.jl",
+    "component/particleSwarmOptimization/positionUpdateTest.jl",
+    "component/particleSwarmOptimization/velocityUpdateTest.jl"
     ]
 
 for testProgram in componentTests