Rearrange test-suite python helper macros a bit

- Handle double [] "escaping" at RPM_PYRUN to avoid surprises when
  its used on its own
- Spin python-wrapped AT_CHECK into a macro of its own (RPMPY_CHECK)
- What formerly was RPMPY_CHECK is now RPMPY_TEST: this represents
  one entire testcase with all its setup and cleanup, whereas
  RPMPY_CHECK (the new one) might be used several times within a
  single test

tests/local.at

@@ -8,7 +8,7 @@ m4_define([RPMDB_CLEAR],[[
 rm -rf "${abs_builddir}"/testing`rpm --eval '%_dbpath'`/*
 ]])
 
-m4_define([RPMPY_RUN],[
+m4_define([RPMPY_RUN],[[
 cat << EOF > test.py
 import rpm, sys
 dbpath=rpm.expandMacro('%_dbpath')
@@ -18,12 +18,18 @@ def myprint(msg = ''):
 $1
 EOF
 python test.py
-])
+]])
 
 m4_define([RPMPY_CHECK],[
+AT_CHECK([RPMPY_RUN([$1])], [], [$2], [$3])
+])
+
+m4_define([RPMPY_TEST],[
 AT_SETUP([$1])
 AT_KEYWORDS([python])
-AT_CHECK([RPMPY_RUN([[$2]])], [], [$3], [$4])
+RPMDB_CLEAR
+RPMDB_INIT
+RPMPY_CHECK([$2], [$3], [$4])
 AT_CLEANUP
 ])
 

tests/rpmdepmatch.at

@@ -1,7 +1,7 @@
 
 AT_BANNER([RPM dependency matching])
 
-RPMPY_CHECK([provide - require pairs],[
+RPMPY_TEST([provide - require pairs],[
 # ((provides), (requires), match) expected values
 tests = [
     # Different names never match

tests/rpmpython.at

@@ -3,13 +3,13 @@
 
 AT_BANNER([Python bindings])
 
-RPMPY_CHECK([module import],[
+RPMPY_TEST([module import],[
 myprint(rpm.__version__)
 ],
 [AT_PACKAGE_VERSION]
 )
 
-RPMPY_CHECK([basic header manipulation],[
+RPMPY_TEST([basic header manipulation],[
 h = rpm.hdr()
 h['name'] = 'testpkg'
 h['version'] = '1.0'
@@ -24,7 +24,7 @@ myprint(h['nevra'])
 testpkg-1.0-1.noarch]
 )
 
-RPMPY_CHECK([reading a package file],[
+RPMPY_TEST([reading a package file],[
 ts = rpm.ts()
 h = ts.hdrFromFdno('${RPMDATA}/RPMS/hello-1.0-1.ppc64.rpm')
 myprint(h['arch'])
@@ -32,7 +32,7 @@ myprint(h['arch'])
 [ppc64]
 )
 
-RPMPY_CHECK([add package to transaction],[
+RPMPY_TEST([add package to transaction],[
 ts = rpm.ts()
 ts.addInstall('${RPMDATA}/RPMS/foo-1.0-1.noarch.rpm', 'u')
 for e in ts: