diff --git a/cases_test.go b/cases_test.go
index 1c663dd..b49bf19 100644
--- a/cases_test.go
+++ b/cases_test.go
@@ -18,7 +18,7 @@
 
 package main
 
-var pominalTestCases = []struct {
+var newPominalTestCases = []struct {
 	name              string
 	description       string
 	workSession       float64
@@ -104,3 +104,47 @@ var pominalTestCases = []struct {
 		},
 	},
 }
+
+var sessionsTestCases = []struct {
+	name                string
+	description         string
+	expectedWorkSession int
+	expectedCycle       int
+	expectedLabel       string
+}{
+	{
+		name:                "Test session 1",
+		description:         "When the first work session has started.",
+		expectedWorkSession: 1,
+		expectedCycle:       1,
+		expectedLabel:       workTimerLabel,
+	},
+	{
+		name:                "Test session 2",
+		description:         "When the first work session has finished and the short break session has started.",
+		expectedWorkSession: 1,
+		expectedCycle:       1,
+		expectedLabel:       shortBreakTimerLabel,
+	},
+	{
+		name:                "Test session 3",
+		description:         "When the short break session has finished and the second work session has started.",
+		expectedWorkSession: 2,
+		expectedCycle:       1,
+		expectedLabel:       workTimerLabel,
+	},
+	{
+		name:                "Test session 4",
+		description:         "When the second work session has finished and the long break has started because the maximum number of work sessions is reached.",
+		expectedWorkSession: 2,
+		expectedCycle:       1,
+		expectedLabel:       longBreakTimerLabel,
+	},
+	{
+		name:                "Test session 5",
+		description:         "When the long break session has finished and the new work session has started for the next Pominal cycle.",
+		expectedWorkSession: 1,
+		expectedCycle:       2,
+		expectedLabel:       workTimerLabel,
+	},
+}
diff --git a/main.go b/main.go
index 4f9ad4d..c842166 100644
--- a/main.go
+++ b/main.go
@@ -27,12 +27,6 @@ import (
 	"github.com/rivo/tview"
 )
 
-const (
-	workTimerLabel       string = "Work"
-	shortBreakTimerLabel string = "Short break"
-	longBreakTimerLabel  string = "Long break"
-)
-
 var (
 	workTime        string
 	shortBreakTime  string
diff --git a/pominal.go b/pominal.go
index e3ba5b5..07d6592 100644
--- a/pominal.go
+++ b/pominal.go
@@ -24,6 +24,12 @@ import (
 	"github.com/rivo/tview"
 )
 
+const (
+	workTimerLabel       string = "Work"
+	shortBreakTimerLabel string = "Short break"
+	longBreakTimerLabel  string = "Long break"
+)
+
 type Pominal struct {
 	// workSession is a counter for work sessions.
 	workSession int
diff --git a/pominal_test.go b/pominal_test.go
index a823822..99be7a6 100644
--- a/pominal_test.go
+++ b/pominal_test.go
@@ -21,6 +21,9 @@ package main
 import (
 	"reflect"
 	"testing"
+	"time"
+
+	"github.com/rivo/tview"
 )
 
 const success = "\u2713"
@@ -29,9 +32,9 @@ const failure = "\u2717"
 // TestNewPominal validates the factory function for generating new
 // Pominal values
 func TestNewPominal(t *testing.T) {
-	t.Log("Given the need to test creating a new value of type Pominal.")
+	t.Log("Given the need to test the creation of a new Pominal instance.")
 	{
-		for _, p := range pominalTestCases {
+		for _, p := range newPominalTestCases {
 			testFunc := func(t *testing.T) {
 				t.Log(p.description)
 				res := NewPominal(
@@ -50,3 +53,54 @@ func TestNewPominal(t *testing.T) {
 		}
 	}
 }
+
+// TestRun validates the Pominal runtime. This test creates a new
+// Pominal instance and executes the runtime in a separate goroutine.
+// To ease testing the work, short break and long break timers are equal.
+// Before the sub-tests are run there is a second delay to allow the
+// runtime to initialise. The test then checks that the correct
+// session label, work session number and pominal cycle number
+// are set for each session. This test runs for exactly one
+// pominal cycle.
+func TestRun(t *testing.T) {
+	pominal := NewPominal(60, 60, 60, 2)
+	defer pominal.Stop()
+
+	// create the most basic text view for the info and timer
+	// views since we are not testing the user interface.
+	infoUI := tview.NewTextView()
+	timerUI := tview.NewTextView()
+
+	// TODO: Remove when support for disabling desktop notifications is in place.
+	initNotifier()
+
+	go pominal.Run(infoUI, timerUI)
+
+	time.Sleep(1 * time.Second)
+
+	t.Log("Given the need to test the Pominal runtime execution.")
+	{
+		for _, s := range sessionsTestCases {
+			testFunc := func(t *testing.T) {
+				t.Log(s.description)
+				if pominal.workSession != s.expectedWorkSession {
+					t.Errorf("%s\tUnexpected work session integer returned: expected %d, got %d", failure, s.expectedWorkSession, pominal.workSession)
+				} else {
+					t.Logf("%s\tExpected work session integer returned.", success)
+				}
+				if pominal.cycle != s.expectedCycle {
+					t.Errorf("%s\tUnexpected pominal cycle integer returned: expected %d, got %d", failure, s.expectedCycle, pominal.cycle)
+				} else {
+					t.Logf("%s\tExpected pominal cycle integer returned.", success)
+				}
+				if pominal.label != s.expectedLabel {
+					t.Errorf("%s\tUnexpected session label returned: expected %s, got %s", failure, s.expectedLabel, pominal.label)
+				} else {
+					t.Logf("%s\tExpected session label returned.", success)
+				}
+			}
+			t.Run(s.name, testFunc)
+			time.Sleep(65 * time.Second)
+		}
+	}
+}