Add hook to stop accidentally committing test flag

Author: GrahamTheCoder

Tests/Readme.md

@@ -2,7 +2,8 @@
 
 * Most tests are "characterization" tests, meaning they represent the current output. This does not mean that it's the ideal output.
 * If you need to change an existing characterization, that's fine, so long as you're convinced it's no less correct than what was previously there.
-* See TestConstants for an automated way to rewrite the expected output en masse.
+* See TestConstants for an automated way to rewrite the expected output en masse 
+ * Run hooks/enable-hooks.cmd to enable a pre-commit hook which stops you committing the flag when true
 
 ## Types
 

hooks/enable-hooks.cmd

@@ -0,0 +1 @@
+git config core.hooksPath hooks

hooks/pre-commit

@@ -0,0 +1,14 @@
+#!/bin/sh
+#
+# Stop us from committing the test constants flag
+#
+disallowed="RecharacterizeByWritingExpectedOverActual.*=.*true" 
+
+git diff --cached --name-status  | egrep TestConstants | while read x file; do
+        if [ "$x" == 'D' ]; then continue; fi
+        if egrep "$disallowed" "$file" ; then
+            echo "ERROR: Disallowed expression \"${disallowed}\" in file: ${file}"
+            exit 1
+        fi
+
+done || exit $?