diff --git a/security_test.go b/security_test.go
new file mode 100644
index 0000000..dc83208
--- /dev/null
+++ b/security_test.go
@@ -0,0 +1,28 @@
+package main
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestApplySecurityLevel(t *testing.T) {
+	t.Run("It sets the correct parameters for security level 0", func(t *testing.T) {
+		ApplySecurityLevel(0)
+		assert.Equal(t, initialBlockDifficulty, securityLevels[0].InitialBlockDifficulty)
+		assert.Equal(t, minimumBlockDifficulty, securityLevels[0].MinimumDifficulty)
+		assert.Equal(t, blocksBeforeSpendable, securityLevels[0].BlocksBeforeSpendable)
+	})
+	t.Run("It sets the correct parameters for security level 1", func(t *testing.T) {
+		ApplySecurityLevel(1)
+		assert.Equal(t, initialBlockDifficulty, securityLevels[1].InitialBlockDifficulty)
+		assert.Equal(t, minimumBlockDifficulty, securityLevels[1].MinimumDifficulty)
+		assert.Equal(t, blocksBeforeSpendable, securityLevels[1].BlocksBeforeSpendable)
+	})
+	t.Run("It sets the correct parameters for security level 2", func(t *testing.T) {
+		ApplySecurityLevel(2)
+		assert.Equal(t, initialBlockDifficulty, securityLevels[2].InitialBlockDifficulty)
+		assert.Equal(t, minimumBlockDifficulty, securityLevels[2].MinimumDifficulty)
+		assert.Equal(t, blocksBeforeSpendable, securityLevels[2].BlocksBeforeSpendable)
+	})
+}