Allow running single tests

This makes testing easier, since I'll only see the test I need and not
everything that runs before it.

Signed-off-by: Anna Schumaker <Anna@OcarinaProject.net>

tests/Sconscript

@@ -3,8 +3,14 @@
 import sys
 Import("env")
 
-if sys.argv.count("tests") > 0:
-	env.Append( CCFLAGS = [ "-DCONFIG_TEST" ] )
+check_depends = True
+
+for arg in sys.argv:
+	if arg.find("tests") == 0:
+		env.Append( CCFLAGS = [ "-DCONFIG_TEST" ] )
+		if len(arg) > 5:
+			check_depends = False
+		break
 
 src = SConscript("src/Sconscript")
 
@@ -17,8 +23,9 @@ prev = None
 for test in tests:
 	t = Command("%s.out" % test, [], "./tests/%s" % test)
 
-	if prev:
+	if prev and (check_depends == True):
 		Depends(t, prev)
 	Depends(t, src)
 	AlwaysBuild(t)
+	Alias("tests/%s" % test, t)
 	prev = t