Add missing tests

[carbontwelve]

Tests for test assets 4 through to 11 are missing or commented out.

[carbontwelve]

• [x] build_test_4 - fixed by #121
• [x] build_test_5 - fixed by #130
• [x] build_test_6 - fixed by #131
• [x] build_test_7 - fixed by #132
• [x] build_test_8 - fixed by #133
• [x] build_test_9 - fixed by #134
• [x] build_test_10 - fixed by #135
• [x] build_test_11 - fixed by #136