Default stub to not echoing anything unless specified

test/restore-test.sh

@@ -10,16 +10,16 @@ source "test-helper.sh"
 my-name-is() { echo "My name is $@."; }
 assert "my-name-is Edward Elric" "My name is Edward Elric."
 
-stub "my-name-is"
+stub "my-name-is" stdout
 assert "my-name-is Edward Elric" "my-name-is stub: Edward Elric"
 
-restore "my-name-is"
+restore "my-name-is" stdout
 assert "my-name-is Edward Elric" "My name is Edward Elric."
 
 
 # Stubbing and restoring a executable file.
 actual_uname="$(uname)"
-stub "uname"
+stub "uname" stdout
 assert "uname" "uname stub: "
 assert "uname -a" "uname stub: -a"
 

test/stub-test.sh

@@ -9,22 +9,34 @@ source "test-helper.sh"
 # Stubbing a bash function.
 my-name-is() { echo "My name is $@."; }
 assert "my-name-is Edward Elric" "My name is Edward Elric."
-
 stub "my-name-is"
+assert "my-name-is" ""
+unset -f my-name-is
+
+
+# Stubbing a executable file.
+stub "uname"
+assert "uname" ""
+unset -f uname
+
+
+# Redirect stub of bash function output to STDOUT.
+my-name-is() { echo "My name is $@."; }
+stub "my-name-is" STDOUT
 assert "my-name-is" "my-name-is stub: "
 assert "my-name-is Edward" "my-name-is stub: Edward"
 assert "my-name-is Edward Elric" "my-name-is stub: Edward Elric"
 unset -f my-name-is
 
 
-# Stubbing a executable file.
-stub "uname"
+# Redirect stub of executable file output to STDOUT.
+stub "uname" STDOUT
 assert "uname" "uname stub: "
-assert "uname -h" "uname stub: -h"
-unset -f uname
+assert "uname -r" "uname stub: -r"
+unset -f my-name-is
 
 
-# Redirect stub output to STDERR.
+# Redirect stub of bash function output to STDERR.
 my-name-is() { echo "My name is $@."; }
 stub "my-name-is" STDERR
 assert "my-name-is Edward" ""
@@ -32,8 +44,26 @@ assert "my-name-is Edward 2>&1" "my-name-is stub: Edward"
 unset -f my-name-is
 
 
+# Redirect stub of executable output to STDERR.
+stub "uname" STDERR
+assert "uname -r" ""
+assert "uname 2>&1" "uname stub: "
+assert "uname -r 2>&1" "uname stub: -r"
+unset -f my-name-is
+
+
+# Redirect stub of bash function output to /dev/null.
+my-name-is() { echo "My name is $@."; }
+stub "my-name-is" null
+assert "my-name-is Edward" ""
+assert "my-name-is Edward 2>&1" ""
+unset -f my-name-is
+
+
 # Stubbing something that doesn't exist.
-stub "cowabunga-dude"
+assert_raises "cowabunga-dude" 127
+stub "cowabunga-dude" stdout
+assert_raises "cowabunga-dude" 0
 assert "cowabunga-dude yeah dude" "cowabunga-dude stub: yeah dude"
 unset -f cowabunga-dude