tests: add test case for substitute bug fixed in GNU ed 1.20.2

edward was itself never subject to this bug, but good to have a test case for it to detect future regressions in either GNU ed or edward. See: https://lists.gnu.org/archive/html/bug-ed/2024-04/msg00003.html
nmeum · May 21, 2024 · 7703c0e · 7703c0e
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diff --git a/README.md b/README.md
@@ -64,7 +64,7 @@ path. More usage information for the edward library is provided below.
 
 This repository contains both unit tests and integration tests. The
 latter require a reference implementation of a POSIX.1-2008 compatible
-ed implementation. Currently, [GNU ed >= 1.18][gnu ed] is used for this
+ed implementation. Currently, [GNU ed >= 1.20.2][gnu ed] is used for this
 purpose.
 
 Both unit and integration tests can be run using:

diff --git a/tests/integration/global-delimiter-omitted-substitute/cmds b/tests/integration/global-delimiter-omitted-substitute/cmds
@@ -0,0 +1 @@
+g/x/s/x/y
diff --git a/tests/integration/global-delimiter-omitted-substitute/opts b/tests/integration/global-delimiter-omitted-substitute/opts
@@ -0,0 +1 @@
+testdata/input-file
diff --git a/tests/integration/global-delimiter-omitted-substitute/testdata/input-file b/tests/integration/global-delimiter-omitted-substitute/testdata/input-file
@@ -0,0 +1,2 @@
+foo
+bxx