inst/tests/test.tabix.R

In bedr: Genomic Region Processing using Tools Such as 'BEDTools', 'BEDOPS' and 'Tabix'

# The bedr package is copyright (c) 2014 Ontario Institute for Cancer Research (OICR)
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context("tabix")

if (check.binary("tabix", verbose = TRUE)) {

	test_that("check tabix", {
		vcf <- system.file("extdata/CosmicCodingMuts_v66_20130725_ex.vcf.gz", package = "bedr");
		regions <- get.example.regions()
		regions$a <- bedr.sort.region(regions$a);

		a.nochr <- gsub("^chr", "", regions$a)

		b <- c("chr1:10-100000","chr10:100-100000")
		b.nochr <- c("1:10-100000","10:100-100000")

		b.nochr.matrix <- index2bed(b.nochr);

		# bad region
		expect_error(tabix("meow", vcf, verbose = T));

		# no chr
		expect_error(tabix(a.nochr, vcf, verbose = T));

		# missing file
		expect_error(tabix(a.nochr, "meow", check.chr = FALSE, verbose = T));

		# check the length of output
		expect_equal(nrow(tabix(a.nochr, vcf, verbose = T, check.chr = FALSE)), NULL);
		expect_equal(nrow(tabix(b.nochr, vcf, verbose = T, check.chr = FALSE)), 6);
	
		# check the header is included
		expect_equal(colnames(tabix(b.nochr, vcf, verbose = T, check.chr = FALSE)), c("CHROM", "POS", "ID", "REF", "ALT", "QUAL", "FILTER", "INFO")); 

		# check header is correct length
		expect_equal(length(attributes(tabix(b.nochr, vcf, verbose = T, check.chr = FALSE))$header), 13);
		})
}