test: change "#!/bin/bash" to "#!/usr/bin/env bash" enhances portability

Change #!/bin/bash at start of tests to "#!/usr/bin/env bash". That way
systems running on bash < 4 can prepend bash >= 4 to path before
running the tests.

test/README

@@ -68,11 +68,11 @@ remaining tests to be unaffected.
 
 Writing Tests
 -------------
-The test script is written as a shell script.  It should start
+The test script is written as a shell script.  It should start with
-with the standard "#!/bin/bash" with copyright notices, and an
+the standard "#!/usr/bin/env bash" with copyright notices, and an
 assignment to variable 'test_description', like this:
 
-	#!/bin/bash
+	#!/usr/bin/env bash
 	#
 	# Copyright (c) 2005 Junio C Hamano
 	#

test/aggregate-results.sh

@@ -1,4 +1,4 @@
-#!/bin/sh
+#!/usr/bin/env bash
 
 fixed=0
 success=0

test/author-order

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 test_description="author reordering;"
 . ./test-lib.sh
 

test/basic

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 #
 # Copyright (c) 2005 Junio C Hamano
 #

test/dump-restore

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 test_description="\"notmuch dump\" and \"notmuch restore\""
 . ./test-lib.sh
 

test/emacs

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 test_description="emacs interface"
 . test-lib.sh
 

test/encoding

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 test_description="encoding issues"
 . ./test-lib.sh
 

test/from-guessing

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 test_description="From line heuristics (with multiple configured addresses)"
 . ./test-lib.sh
 

test/json

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 test_description="--format=json output"
 . ./test-lib.sh
 

test/long-id

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 test_description="messages with ridiculously-long message IDs"
 . ./test-lib.sh
 

test/maildir-sync

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 
 test_description="maildir synchronization"
 

test/new

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 test_description='"notmuch new" in several variations'
 . ./test-lib.sh
 

test/notmuch-test

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 
 # Run tests
 #

test/raw

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr//bin/env bash
 
 test_description='notmuch show --format=raw'
 . ./test-lib.sh

test/reply

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 test_description="\"notmuch reply\" in several variations"
 . ./test-lib.sh
 

test/search

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 test_description='"notmuch search" in several variations'
 . ./test-lib.sh
 

test/search-output

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 test_description='various settings for "notmuch search --output="'
 . ./test-lib.sh
 

test/test-lib.sh

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 #
 # Copyright (c) 2005 Junio C Hamano
 #

test/test-verbose

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 
 test_description='the verbosity options of the test framework itself.'
 

test/thread-naming

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 test_description="naming of threads with changing subject"
 . ./test-lib.sh
 

test/thread-order

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 test_description="threading when messages received out of order"
 . ./test-lib.sh
 

test/uuencode

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 test_description="handling of uuencoded data"
 . ./test-lib.sh
 

test/valgrind/valgrind.sh

@@ -1,4 +1,4 @@
-#!/bin/sh
+#!/usr/bin/env bash
 
 base=$(basename "$0")