Add tests for test harness

test/harness/assert-false.js

test/harness/assert-notsamevalue-nan.js

test/harness/assert-notsamevalue-notsame.js

test/harness/assert-notsamevalue-objects.js

test/harness/assert-notsamevalue-zeros.js

test/harness/assert-obj.js

test/harness/assert-samevalue-nan.js

test/harness/assert-samevalue-objects.js

test/harness/assert-samevalue-same.js

test/harness/assert-samevalue-zeros.js

test/harness/assert-throws-custom.js

test/harness/assert-throws-incorrect-ctor.js

test/harness/assert-throws-native.js

test/harness/assert-throws-no-arg.js

test/harness/assert-throws-no-error.js

test/harness/assert-throws-null.js

test/harness/assert-throws-primitive.js

test/harness/assert-throws-single-arg.js

test/harness/assert-true.js

test/harness/compare-array-different-elements.js