diff --git a/.travis.yml b/.travis.yml
index e2191a7c..33f99bbd 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -19,4 +19,5 @@ install:
 
 script:
   - test/powerlevel9k.spec
+  - test/functions/utilities.spec
 
diff --git a/test/functions/utilities.spec b/test/functions/utilities.spec
new file mode 100755
index 00000000..12501348
--- /dev/null
+++ b/test/functions/utilities.spec
@@ -0,0 +1,22 @@
+#!/usr/bin/env zsh
+#vim:ft=zsh ts=2 sw=2 sts=2 et fenc=utf-8
+
+# Required for shunit2 to run correctly
+setopt shwordsplit
+SHUNIT_PARENT=$0
+
+function oneTimeSetUp() {
+  # Load Powerlevel9k
+  source functions/utilities.zsh
+}
+
+function testPrintSizeHumanReadableWithBigNumber() {
+  # Interesting: Currently we can't support numbers bigger than that.
+  assertEquals '0.87E' "$(printSizeHumanReadable 1000000000000000000)"
+}
+
+function testPrintSizeHumanReadableWithExabytesAsBase() {
+  assertEquals '9.77Z' "$(printSizeHumanReadable 10000 'E')"
+}
+
+source shunit2/source/2.1/src/shunit2