manifest: fix AttributeError in self import

This only passed CI because we had no coverage. Now we do.

Signed-off-by: Martí Bolívar <marti.bolivar@nordicsemi.no>

src/west/manifest.py

@@ -635,7 +635,7 @@ class Manifest:
             for subimp in imp:
                 self._import_from_self(mp, subimp, projects)
         elif imptype == dict:
-            self._import_map(mp, imp, self.import_path_from_self, projects)
+            self._import_map(mp, imp, self._import_path_from_self, projects)
         else:
             self._malformed(f'{mp.abspath}: "self: import: {imp}" '
                             f'has invalid type {imptype}')

tests/test_manifest.py

@@ -1676,6 +1676,21 @@ _IMPORT_SELF_MANIFESTS = [
           - west.d/02-vendor-hals.yml
           - west.d/03-applications.yml
     '''
+    # as an equivalent map:
+    '''\
+    manifest:
+      remotes:
+        - name: upstream
+          url-base: upstream.com
+      projects:
+        - name: upstream
+          remote: upstream
+          revision: refs/tags/v1.0
+          import: true
+      self:
+        import:
+          file: west.d
+    '''
 ]
 
 _IMPORT_SELF_SUBMANIFESTS = {