testsuite: add some tests for ash

Signed-off-by: Ron Yorston <rmy@pobox.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

shell/ash_test/ash-vars/var-pattern-replacement-in-parameter-expansion-1.right

@@ -0,0 +1 @@
+a_\_z_c

shell/ash_test/ash-vars/var-pattern-replacement-in-parameter-expansion-1.tests

@@ -0,0 +1,2 @@
+v="a\bc"
+echo ${v/\\b/_\\_\z_}

shell/ash_test/ash-vars/var-pattern-replacement-in-parameter-expansion-2.right

@@ -0,0 +1 @@
+ax/yc

shell/ash_test/ash-vars/var-pattern-replacement-in-parameter-expansion-2.tests

@@ -0,0 +1,2 @@
+v="abc"
+echo ${v/b/x/y}

shell/ash_test/ash-vars/var-pattern-replacement-in-parameter-expansion-3.right

@@ -0,0 +1 @@
+axcabc

shell/ash_test/ash-vars/var-pattern-replacement-in-parameter-expansion-3.tests

@@ -0,0 +1,2 @@
+v="abcabc"
+echo ${v/b/x}

shell/ash_test/ash-vars/var-pattern-replacement-in-parameter-expansion-4.right

@@ -0,0 +1 @@
+axcaxc

shell/ash_test/ash-vars/var-pattern-replacement-in-parameter-expansion-4.tests

@@ -0,0 +1,2 @@
+v="abcabc"
+echo ${v//b/x}

shell/ash_test/ash-vars/var-pattern-replacement-in-parameter-expansion-5.right

@@ -0,0 +1 @@
+axc

shell/ash_test/ash-vars/var-pattern-replacement-in-parameter-expansion-5.tests

@@ -0,0 +1,2 @@
+v="ab/c"
+echo ${v/b\//x}