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diff --git a/t/01-basic.t b/t/01-basic.t
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+use v6.c;
+use Test;
+use AdventOfCode;
+
+plan 8;
+
+my $test-vm = IntcodeVM.new(slurp("./data/day2-a.txt"));
+
+sub check-vm($input, $output, $name) {
+    my $vm = IntcodeVM.new($input);
+    $vm.run;
+    is $vm.memory.join(','), $output, $name;
+}
+
+check-vm "1,0,0,0,99", "2,0,0,0,99", 'first example';
+check-vm "2,3,0,3,99", "2,3,0,6,99", 'second example';
+check-vm '2,4,4,5,99,0', '2,4,4,5,99,9801', 'third example';
+check-vm '1,1,1,4,99,5,6,0,99', '30,1,1,4,2,5,6,0,99', 'last example';
+
+{
+    my $input = slurp("./data/day2-a.txt");
+    my $vm = IntcodeVM.new($input);
+    $vm.memory[1] = 12;
+    $vm.memory[2] = 2;
+
+    $vm.run();
+
+    is $vm.output, 3760627, "day 2 first problem output";
+}
+
+subtest "VM don't change program after run", {
+    my $input = '1,1,1,4,99,5,6,0,99';
+    my $vm = IntcodeVM.new($input);
+    $vm.run;
+    is $vm.program, $input.split(','), 'simple input';
+}
+
+subtest "VM resets memory", {
+    my $input = '1,1,1,4,99,5,6,0,99';
+    my $vm = IntcodeVM.new($input);
+    $vm.run;
+    isnt $vm.memory, $vm.program, 'Run changes memory';
+    my $memory = $vm.memory;
+    $vm.reset-memory();
+    is $vm.memory, $vm.program, '.reset-memory() resets memory to program';
+
+    $test-vm.memory[1] = 12;
+    $test-vm.memory[2] = 2;
+    $test-vm.run;
+    is $test-vm.output, 3760627, "day 2 first problem output";
+    $test-vm.reset-memory;
+    isnt $test-vm.output, 3760627, "day2 first problem resets memory";
+}
+
+subtest "day2 example", {
+    my $input = slurp("./data/day2-a.txt");
+    my $vm = IntcodeVM.new($input);
+    $vm.run();
+}
+
+
+done-testing;