chr1	test	transcript	1	100	.	+	.	transcript_id=A; test_case=Same transcript, 2 samples;
chr1	test	exon	70	90	.	+	.	transcript_id=A; test_case=Same transcript, 2 samples;
chr1	test	exon	90	100	.	+	.	transcript_id=A; test_case=Same transcript, 2 samples;
chr2	test	transcript	201	300	.	+	.	transcript_id=B; test_case=Different strand;
chr2	test	exon	201	300	.	+	.	transcript_id=B; test_case=Different strand;
chr3	test	gene	1	100	.	+	.	gene_id=C; test_case=Gene records are unchanged;
chr3	test	transcript	1	110	.	+	.	transcript_id=C; test_case=Different UTR, same CDS;
chr3	test	exon	1	50	.	+	.	transcript_id=C; test_case=Different UTR, same CDS;
chr3	test	exon	70	110	.	+	.	transcript_id=C; test_case=Different UTR, same CDS;
chr3	test	CDS	40	50	.	+	0	transcript_id=C; test_case=Different UTR, same CDS;
chr3	test	CDS	90	100	.	+	0	transcript_id=C; test_case=Different UTR, same CDS;
chr4	test	transcript	100	200	.	+	.	transcript_id=E; test_case=Same UTR, different CDS;
chr4	test	exon	100	200	.	+	.	transcript_id=E; test_case=Same UTR, different CDS;
chr4	test	CDS	120	180	.	+	.	transcript_id=E; test_case=Same UTR, different CDS;
chr1	test	exon	1	50	.	+	.	transcript_id=A; test_case=Same transcript, 2 samples (unordered exon);