fix(pkg): fix using ~ as the lower bound for RangeMinMax

pkg/perfdata/range.go

@@ -35,6 +35,9 @@ func RangeMinMax(min, max string) *Range {
 		panic("invalid performance data range minimum value")
 	}
 	pdRange := &Range{}
+	if min == "~" {
+		min = ""
+	}
 	pdRange.start = min
 	pdRange.end = max
 	return pdRange

pkg/perfdata/range_test.go

@@ -43,6 +43,14 @@ func TestRangeMinMax(t *testing.T) {
 	assert.False(t, pdr.inside, "Inside flag should not be set")
 }
 
+func TestRangeMinMaxOpen(t *testing.T) {
+	min, max := "~", "456"
+	pdr := RangeMinMax(min, max)
+	assert.Equal(t, "", pdr.start, "Min value not clear in PerfDataRange")
+	assert.Equal(t, max, pdr.end, "Max value not copied to PerfDataRange")
+	assert.False(t, pdr.inside, "Inside flag should not be set")
+}
+
 func TestRangeInside(t *testing.T) {
 	pdr := &Range{}
 	pdr = pdr.Inside()