Add comprehensive tests for root command behavior

test/root.bats

@@ -0,0 +1,31 @@
+#!/usr/bin/env bats
+
+load test_helper
+
+@test "root command shows help when no subcommand provided" {
+    run pomodoro
+
+    [ "$status" -eq 0 ]
+    [[ "$output" =~ "A simple Pomodoro command-line client" ]]
+    [[ "$output" =~ "Usage:" ]]
+    [[ "$output" =~ "Available Commands:" ]]
+}
+
+@test "root command --help produces same output as no subcommand" {
+    run pomodoro
+    no_subcommand_output="$output"
+
+    run pomodoro --help
+    help_flag_output="$output"
+
+    [ "$no_subcommand_output" = "$help_flag_output" ]
+}
+
+@test "root command help subcommand shows help output" {
+    run pomodoro help
+
+    [ "$status" -eq 0 ]
+    [[ "$output" =~ "A simple Pomodoro command-line client" ]]
+    [[ "$output" =~ "Usage:" ]]
+    [[ "$output" =~ "Available Commands:" ]]
+}