Add tests

[rodionovd]

Tests that should pass:

• [x] Inject x86_64 payload from x86_64 host into x86_64 target
• [x] Inject FAT payload from x86_64 host into x86_64 target
• [x] Inject i386 payload from x86_64 host into i386 target
• [x] Inject FAT payload from x86_64 host into i386 target
• [x] Inject x86_64 payload from i386 host into x86_64 target
• [x] Inject FAT payload fromi386 host into x86_64 target
• [x] Inject i386 payload from i386 host into i386 target
• [x] Inject FAT payload from i386 host into i386 target

  Tests that should fail:

• [x] Inject i386 payload from x86_64 host into x86_64 target
• [x] Inject x86_64 payload from x86_64 host into i386 target
• [x] Inject i386 payload from i386 host into x86_64 target
• [x] Inject x86_64 payload from i386 host into i386 target