From 908e7042604599caa19c3d7e607a72b60f686ccd Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Hugo=20H=C3=B6rnquist?= <hugo@lysator.liu.se>
Date: Sat, 28 Oct 2023 23:37:44 +0200
Subject: Add tests for '(hnh test util)'.

---
 module/hnh/test/util.scm      |  3 ++-
 tests/unit/util/test-util.scm | 45 +++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 47 insertions(+), 1 deletion(-)
 create mode 100644 tests/unit/util/test-util.scm

diff --git a/module/hnh/test/util.scm b/module/hnh/test/util.scm
index b0f3342a..ba0f8bfb 100644
--- a/module/hnh/test/util.scm
+++ b/module/hnh/test/util.scm
@@ -38,7 +38,8 @@
 
 (define (string-replace-head s1 s2)
   (string-replace s1 s2
-                  0 (string-length s2)))
+                  0 (min (string-length s1)
+                         (string-length s2))))
 
 
 (define diff-cmd
diff --git a/tests/unit/util/test-util.scm b/tests/unit/util/test-util.scm
new file mode 100644
index 00000000..d5853c95
--- /dev/null
+++ b/tests/unit/util/test-util.scm
@@ -0,0 +1,45 @@
+(define-module (test test-util)
+  :use-module (srfi srfi-64)
+  :use-module (srfi srfi-64 test-error)
+  :use-module (srfi srfi-88)
+  :use-module (hnh test util))
+
+(test-equal "µs" #e2e6 (µs 2))
+
+(test-equal "transform-time-of-day"
+  1698494486139313
+  (transform-time-of-day
+   ;; As returned by (gettimeofday)
+   '(1698494486 . 139313)))
+
+;; green
+;; red
+;; yellow
+;; bold
+;; make-indent
+
+(test-equal "Indent"
+  "        "
+  (make-indent 4))
+
+(test-equal "" (string-replace-head "" ""))
+(test-equal "H" (string-replace-head "" "H"))
+(test-equal "TAIL" (string-replace-head "TAIL" ""))
+(test-equal "HAIL" (string-replace-head "TAIL" "H"))
+
+
+;;; This is far from perfect
+(test-assert "Is some form of diff produced"
+  (string?
+              (diff
+               "This is the
+first
+string.
+"
+               "This is the
+second
+string.
+")))
+
+
+'((hnh test util))
-- 
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