diff --git a/interval/lift/lift.go b/interval/lift/lift.go
index 6a9c14717..06f46f27d 100644
--- a/interval/lift/lift.go
+++ b/interval/lift/lift.go
@@ -1,3 +1,4 @@
+// Package lift provides an interface and utilities for working with genomic regions and offer flexibility to modify their coordinates.
 package lift
 
 import (
diff --git a/interval/lift/lift_test.go b/interval/lift/lift_test.go
index 48e331816..fbe9ace8c 100644
--- a/interval/lift/lift_test.go
+++ b/interval/lift/lift_test.go
@@ -4,6 +4,7 @@ import (
 	"testing"
 
 	"github.com/vertgenlab/gonomics/bed"
+	"github.com/vertgenlab/gonomics/interval"
 )
 
 var ReadingTests = []struct {
@@ -22,3 +23,29 @@ func TestReading(t *testing.T) {
 		}
 	}
 }
+
+func TestIntervalSliceToLift(t *testing.T) {
+	// Create intervals where some implement Lift, others don't
+	intervals := []interval.Interval{
+		bed.Bed{Chrom: "chr1", ChromStart: 1, ChromEnd: 30},
+		bed.Bed{Chrom: "chr2", ChromStart: 300, ChromEnd: 400},
+	}
+	lifts := IntervalSliceToLift(intervals)
+	expected := []Lift{
+		bed.Bed{Chrom: "chr1", ChromStart: 1, ChromEnd: 30},
+		bed.Bed{Chrom: "chr2", ChromStart: 300, ChromEnd: 400},
+	}
+	if !allAreEqual(lifts, expected) {
+		t.Errorf("Error: IntervalSliceToLift(intervals, expected) do not equal.\n")
+	}
+}
+
+func TestMatchOverlapLen(t *testing.T) {
+	var one bed.Bed = bed.Bed{Chrom: "chr1", ChromStart: 5, ChromEnd: 15}
+	var two bed.Bed = bed.Bed{Chrom: "chr1", ChromStart: 11, ChromEnd: 14}
+	overlapSize := MatchOverlapLen(one.GetChromStart(), one.GetChromEnd(), two.GetChromStart(), two.GetChromEnd())
+	expected := 3
+	if overlapSize != expected {
+		t.Errorf("Error: MatchOverlapLen(%d, %d, %d, %d) %d != %d\n", one.GetChromStart(), one.GetChromEnd(), two.GetChromStart(), two.GetChromEnd(), overlapSize, expected)
+	}
+}