diff --git a/log_test.go b/log_test.go
new file mode 100644
index 0000000..4d91ed9
--- /dev/null
+++ b/log_test.go
@@ -0,0 +1,64 @@
+package logger
+
+import (
+	"os"
+	"testing"
+)
+
+// TestBug1NilPointerDereference reproduces and verifies the fix for nil pointer dereference bug
+func TestBug1NilPointerDereference(t *testing.T) {
+	// Save original state
+	originalLog := log
+	originalFailFast := failFast
+
+	// Restore state after test
+	defer func() {
+		log = originalLog
+		failFast = originalFailFast
+		os.Unsetenv("WARNFAIL_I2P")
+		os.Unsetenv("DEBUG_I2P")
+	}()
+
+	// Set up conditions that trigger the bug
+	log = nil         // Simulate uninitialized logger
+	failFast = "true" // Enable fast-fail mode
+
+	// Set environment to enable fast-fail
+	os.Setenv("WARNFAIL_I2P", "true")
+	os.Setenv("DEBUG_I2P", "debug")
+
+	defer func() {
+		if r := recover(); r != nil {
+			// This should be a controlled panic, not a nil pointer dereference
+			if r == "Logger not initialized but fast-fail mode enabled" {
+				t.Logf("Correct controlled panic occurred: %v", r)
+			} else {
+				t.Errorf("Unexpected panic: %v", r)
+			}
+		}
+	}()
+
+	// This should trigger a controlled panic instead of nil pointer dereference
+	warnFatal("test warning")
+	t.Fatal("Expected controlled panic, but none occurred")
+}
+
+// TestBug1FixVerification verifies that normal operation works after the fix
+func TestBug1FixVerification(t *testing.T) {
+	// Initialize a new logger properly
+	logger := New()
+
+	// Save original state
+	originalFailFast := failFast
+	defer func() {
+		failFast = originalFailFast
+		os.Unsetenv("WARNFAIL_I2P")
+	}()
+
+	// Test that warnings work normally when failFast is not set
+	failFast = ""
+	logger.Warn("test warning - should not cause panic")
+
+	// Test should reach here without panicking
+	t.Log("Normal warning operation works correctly")
+}