diff --git a/src/testdir/test57.in b/src/testdir/test57.in
index 0bb95ad..5f23535 100644
--- a/src/testdir/test57.in
+++ b/src/testdir/test57.in
@@ -32,6 +32,7 @@
 :/^t27:/+1,/^t28/-1sort no
 :/^t28:/+1,/^t29/-1sort b
 :/^t29:/+1,/^t30/-1sort b
+:/^t30:/+1,/^t31/-1sort f
 :/^t01:/,$wq! test.out
 ENDTEST
 
@@ -496,9 +497,9 @@
 b322b
 b321
 b321b
+
+
 t28: binary
-
-
 0b111000
 0b101100
 0b101001
@@ -513,9 +514,9 @@
 0b100010
 0b100100
 0b100010
+
+
 t29: binary with leading characters
-
-
 0b100010
 0b010000
  0b101001
@@ -530,4 +531,15 @@
 0b101010
 0b000000
 b0b111000
-t30: done
+
+
+t30: float
+1.234
+0.88
+123.456
+1.15e-6
+-1.1e3
+-1.01e3
+
+
+t31: done