diff --git a/test/fixtures/iris.tsv b/test/fixtures/IRIStsv.tsv
similarity index 100%
rename from test/fixtures/iris.tsv
rename to test/fixtures/IRIStsv.tsv
diff --git a/test/fixtures/iris_readme.tsv b/test/fixtures/iris_readme.tsv
deleted file mode 100644
index 79fc9e9..0000000
--- a/test/fixtures/iris_readme.tsv
+++ /dev/null
@@ -1,151 +0,0 @@
-sepal_length	sepal_width	petal_length	petal_width	species
-5.1	3.5	1.4	0.2	Iris-setosa
-4.9	3	1.4	0.2	Iris-setosa
-4.7	3.2	1.3	0.2	Iris-setosa
-4.6	3.1	1.5	0.2	Iris-setosa
-5	3.6	1.4	0.2	Iris-setosa
-5.4	3.9	1.7	0.4	Iris-setosa
-4.6	3.4	1.4	0.3	Iris-setosa
-5	3.4	1.5	0.2	Iris-setosa
-4.4	2.9	1.4	0.2	Iris-setosa
-4.9	3.1	1.5	0.1	Iris-setosa
-5.4	3.7	1.5	0.2	Iris-setosa
-4.8	3.4	1.6	0.2	Iris-setosa
-4.8	3	1.4	0.1	Iris-setosa
-4.3	3	1.1	0.1	Iris-setosa
-5.8	4	1.2	0.2	Iris-setosa
-5.7	4.4	1.5	0.4	Iris-setosa
-5.4	3.9	1.3	0.4	Iris-setosa
-5.1	3.5	1.4	0.3	Iris-setosa
-5.7	3.8	1.7	0.3	Iris-setosa
-5.1	3.8	1.5	0.3	Iris-setosa
-5.4	3.4	1.7	0.2	Iris-setosa
-5.1	3.7	1.5	0.4	Iris-setosa
-4.6	3.6	1	0.2	Iris-setosa
-5.1	3.3	1.7	0.5	Iris-setosa
-4.8	3.4	1.9	0.2	Iris-setosa
-5	3	1.6	0.2	Iris-setosa
-5	3.4	1.6	0.4	Iris-setosa
-5.2	3.5	1.5	0.2	Iris-setosa
-5.2	3.4	1.4	0.2	Iris-setosa
-4.7	3.2	1.6	0.2	Iris-setosa
-4.8	3.1	1.6	0.2	Iris-setosa
-5.4	3.4	1.5	0.4	Iris-setosa
-5.2	4.1	1.5	0.1	Iris-setosa
-5.5	4.2	1.4	0.2	Iris-setosa
-4.9	3.1	1.5	0.1	Iris-setosa
-5	3.2	1.2	0.2	Iris-setosa
-5.5	3.5	1.3	0.2	Iris-setosa
-4.9	3.1	1.5	0.1	Iris-setosa
-4.4	3	1.3	0.2	Iris-setosa
-5.1	3.4	1.5	0.2	Iris-setosa
-5	3.5	1.3	0.3	Iris-setosa
-4.5	2.3	1.3	0.3	Iris-setosa
-4.4	3.2	1.3	0.2	Iris-setosa
-5	3.5	1.6	0.6	Iris-setosa
-5.1	3.8	1.9	0.4	Iris-setosa
-4.8	3	1.4	0.3	Iris-setosa
-5.1	3.8	1.6	0.2	Iris-setosa
-4.6	3.2	1.4	0.2	Iris-setosa
-5.3	3.7	1.5	0.2	Iris-setosa
-5	3.3	1.4	0.2	Iris-setosa
-7	3.2	4.7	1.4	Iris-versicolor
-6.4	3.2	4.5	1.5	Iris-versicolor
-6.9	3.1	4.9	1.5	Iris-versicolor
-5.5	2.3	4	1.3	Iris-versicolor
-6.5	2.8	4.6	1.5	Iris-versicolor
-5.7	2.8	4.5	1.3	Iris-versicolor
-6.3	3.3	4.7	1.6	Iris-versicolor
-4.9	2.4	3.3	1	Iris-versicolor
-6.6	2.9	4.6	1.3	Iris-versicolor
-5.2	2.7	3.9	1.4	Iris-versicolor
-5	2	3.5	1	Iris-versicolor
-5.9	3	4.2	1.5	Iris-versicolor
-6	2.2	4	1	Iris-versicolor
-6.1	2.9	4.7	1.4	Iris-versicolor
-5.6	2.9	3.6	1.3	Iris-versicolor
-6.7	3.1	4.4	1.4	Iris-versicolor
-5.6	3	4.5	1.5	Iris-versicolor
-5.8	2.7	4.1	1	Iris-versicolor
-6.2	2.2	4.5	1.5	Iris-versicolor
-5.6	2.5	3.9	1.1	Iris-versicolor
-5.9	3.2	4.8	1.8	Iris-versicolor
-6.1	2.8	4	1.3	Iris-versicolor
-6.3	2.5	4.9	1.5	Iris-versicolor
-6.1	2.8	4.7	1.2	Iris-versicolor
-6.4	2.9	4.3	1.3	Iris-versicolor
-6.6	3	4.4	1.4	Iris-versicolor
-6.8	2.8	4.8	1.4	Iris-versicolor
-6.7	3	5	1.7	Iris-versicolor
-6	2.9	4.5	1.5	Iris-versicolor
-5.7	2.6	3.5	1	Iris-versicolor
-5.5	2.4	3.8	1.1	Iris-versicolor
-5.5	2.4	3.7	1	Iris-versicolor
-5.8	2.7	3.9	1.2	Iris-versicolor
-6	2.7	5.1	1.6	Iris-versicolor
-5.4	3	4.5	1.5	Iris-versicolor
-6	3.4	4.5	1.6	Iris-versicolor
-6.7	3.1	4.7	1.5	Iris-versicolor
-6.3	2.3	4.4	1.3	Iris-versicolor
-5.6	3	4.1	1.3	Iris-versicolor
-5.5	2.5	4	1.3	Iris-versicolor
-5.5	2.6	4.4	1.2	Iris-versicolor
-6.1	3	4.6	1.4	Iris-versicolor
-5.8	2.6	4	1.2	Iris-versicolor
-5	2.3	3.3	1	Iris-versicolor
-5.6	2.7	4.2	1.3	Iris-versicolor
-5.7	3	4.2	1.2	Iris-versicolor
-5.7	2.9	4.2	1.3	Iris-versicolor
-6.2	2.9	4.3	1.3	Iris-versicolor
-5.1	2.5	3	1.1	Iris-versicolor
-5.7	2.8	4.1	1.3	Iris-versicolor
-6.3	3.3	6	2.5	Iris-virginica
-5.8	2.7	5.1	1.9	Iris-virginica
-7.1	3	5.9	2.1	Iris-virginica
-6.3	2.9	5.6	1.8	Iris-virginica
-6.5	3	5.8	2.2	Iris-virginica
-7.6	3	6.6	2.1	Iris-virginica
-4.9	2.5	4.5	1.7	Iris-virginica
-7.3	2.9	6.3	1.8	Iris-virginica
-6.7	2.5	5.8	1.8	Iris-virginica
-7.2	3.6	6.1	2.5	Iris-virginica
-6.5	3.2	5.1	2	Iris-virginica
-6.4	2.7	5.3	1.9	Iris-virginica
-6.8	3	5.5	2.1	Iris-virginica
-5.7	2.5	5	2	Iris-virginica
-5.8	2.8	5.1	2.4	Iris-virginica
-6.4	3.2	5.3	2.3	Iris-virginica
-6.5	3	5.5	1.8	Iris-virginica
-7.7	3.8	6.7	2.2	Iris-virginica
-7.7	2.6	6.9	2.3	Iris-virginica
-6	2.2	5	1.5	Iris-virginica
-6.9	3.2	5.7	2.3	Iris-virginica
-5.6	2.8	4.9	2	Iris-virginica
-7.7	2.8	6.7	2	Iris-virginica
-6.3	2.7	4.9	1.8	Iris-virginica
-6.7	3.3	5.7	2.1	Iris-virginica
-7.2	3.2	6	1.8	Iris-virginica
-6.2	2.8	4.8	1.8	Iris-virginica
-6.1	3	4.9	1.8	Iris-virginica
-6.4	2.8	5.6	2.1	Iris-virginica
-7.2	3	5.8	1.6	Iris-virginica
-7.4	2.8	6.1	1.9	Iris-virginica
-7.9	3.8	6.4	2	Iris-virginica
-6.4	2.8	5.6	2.2	Iris-virginica
-6.3	2.8	5.1	1.5	Iris-virginica
-6.1	2.6	5.6	1.4	Iris-virginica
-7.7	3	6.1	2.3	Iris-virginica
-6.3	3.4	5.6	2.4	Iris-virginica
-6.4	3.1	5.5	1.8	Iris-virginica
-6	3	4.8	1.8	Iris-virginica
-6.9	3.1	5.4	2.1	Iris-virginica
-6.7	3.1	5.6	2.4	Iris-virginica
-6.9	3.1	5.1	2.3	Iris-virginica
-5.8	2.7	5.1	1.9	Iris-virginica
-6.8	3.2	5.9	2.3	Iris-virginica
-6.7	3.3	5.7	2.5	Iris-virginica
-6.7	3	5.2	2.3	Iris-virginica
-6.3	2.5	5	1.9	Iris-virginica
-6.5	3	5.2	2	Iris-virginica
-6.2	3.4	5.4	2.3	Iris-virginica
-5.9	3	5.1	1.8	Iris-virginica