1 files changed, 137 insertions, 0 deletions
diff --git a/internal/timer/operations_test.go b/internal/timer/operations_test.go
new file mode 100644
index 0000000..39029b0
--- /dev/null
+++ b/internal/timer/operations_test.go
@@ -0,0 +1,137 @@
+package timer
+
+import (
+	"path/filepath"
+	"testing"
+	"time"
+)
+
+// setup sets up a temporary state file for testing.
+func setup(t *testing.T) {
+	t.Helper()
+	tempDir := t.TempDir()
+	stateFilePathOverride = filepath.Join(tempDir, ".timr_state")
+	t.Cleanup(func() {
+		stateFilePathOverride = ""
+	})
+}
+
+func TestStartTimer(t *testing.T) {
+	setup(t)
+
+	// Start the timer
+	msg, err := StartTimer()
+	if err != nil {
+		t.Fatalf("StartTimer() error = %v", err)
+	}
+	if msg != "Timer started." {
+		t.Errorf("StartTimer() msg = %v, want %v", msg, "Timer started.")
+	}
+
+	// Check the state
+	state, err := LoadState()
+	if err != nil {
+		t.Fatalf("LoadState() error = %v", err)
+	}
+	if !state.Running {
+		t.Error("state.Running = false, want true")
+	}
+
+	// Try to start again
+	msg, err = StartTimer()
+	if err != nil {
+		t.Fatalf("StartTimer() error = %v", err)
+	}
+	if msg != "Timer is already running." {
+		t.Errorf("StartTimer() msg = %v, want %v", msg, "Timer is already running.")
+	}
+}
+
+func TestStopTimer(t *testing.T) {
+	setup(t)
+
+	// Stop before starting
+	msg, err := StopTimer()
+	if err != nil {
+		t.Fatalf("StopTimer() error = %v", err)
+	}
+	if msg != "Timer is not running." {
+		t.Errorf("StopTimer() msg = %v, want %v", msg, "Timer is not running.")
+	}
+
+	// Start and then stop the timer
+	_, _ = StartTimer()
+	time.Sleep(10 * time.Millisecond) // Simulate work
+	msg, err = StopTimer()
+	if err != nil {
+		t.Fatalf("StopTimer() error = %v", err)
+	}
+	if msg != "Timer stopped." {
+		t.Errorf("StopTimer() msg = %v, want %v", msg, "Timer stopped.")
+	}
+
+	// Check the state
+	state, err := LoadState()
+	if err != nil {
+		t.Fatalf("LoadState() error = %v", err)
+	}
+	if state.Running {
+		t.Error("state.Running = true, want false")
+	}
+	if state.ElapsedTime == 0 {
+		t.Error("state.ElapsedTime = 0, want > 0")
+	}
+}
+
+func TestGetStatus(t *testing.T) {
+	setup(t)
+
+	// Status when stopped
+	msg, err := GetStatus()
+	if err != nil {
+		t.Fatalf("GetStatus() error = %v", err)
+	}
+	want := "Status: Stopped\nElapsed Time: 0s"
+	if msg != want {
+		t.Errorf("GetStatus() msg = %q, want %q", msg, want)
+	}
+
+	// Status when running
+	_, _ = StartTimer()
+	msg, err = GetStatus()
+	if err != nil {
+		t.Fatalf("GetStatus() error = %v", err)
+	}
+	want = "Status: Running\nElapsed Time: 0s"
+	if msg != want {
+		t.Errorf("GetStatus() msg = %q, want %q", msg, want)
+	}
+}
+
+func TestResetTimer(t *testing.T) {
+	setup(t)
+
+	// Start timer to create a state file
+	_, _ = StartTimer()
+
+	// Reset the timer
+	msg, err := ResetTimer()
+	if err != nil {
+		t.Fatalf("ResetTimer() error = %v", err)
+	}
+	if msg != "Timer reset." {
+		t.Errorf("ResetTimer() msg = %v, want %v", msg, "Timer reset.")
+	}
+
+	// Check the state
+	state, err := LoadState()
+	if err != nil {
+		t.Fatalf("LoadState() error = %v", err)
+	}
+	if state.Running {
+		t.Error("state.Running = true, want false")
+	}
+	if state.ElapsedTime != 0 {
+		t.Errorf("state.ElapsedTime = %v, want 0", state.ElapsedTime)
+	}
+}