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-rw-r--r--gnu/packages/graphviz.scm1
1 files changed, 1 insertions, 0 deletions
diff --git a/gnu/packages/graphviz.scm b/gnu/packages/graphviz.scm
index 34aa1dc470..dd5d2de87b 100644
--- a/gnu/packages/graphviz.scm
+++ b/gnu/packages/graphviz.scm
@@ -194,6 +194,7 @@ interfaces for other technical domains.")
      (list unzip
            ;; For tests.
            graphviz
+           python-mock
            python-pytest
            python-pytest-cov
            python-pytest-mock))