mutants: Move config from CI command lines to config file.

.cargo/mutants.toml

@@ -0,0 +1,10 @@
+# Cannot specify a package list here
+
+exclude_globs = [
+    "tests.rs",
+    "all-is-cubes/src/content/**",# TODO: maybe un-exclude content once we are out of more important things (it's hard to test thoroughly)
+]
+exclude_re = [
+    "::fmt ->", # easy to break, hard to test
+    "<impl Arbitrary for ", # near-impossible to test
+]

.github/workflows/ci.yml

@@ -317,8 +317,8 @@ jobs:
           git diff origin/${{ github.base_ref }}.. | tee git.diff
       
       - name: Mutants
-        # See mutants.yml for notes on the exclusions
-        run: cargo mutants --in-diff git.diff --package all-is-cubes --exclude-re '::fmt ->' --exclude tests.rs -- --all-features
+        # See mutants.yml for notes on the package selection
+        run: cargo mutants --in-diff git.diff --package all-is-cubes -- --all-features
 
       - uses: actions/upload-artifact@v3
         if: always()

.github/workflows/mutants.yml

@@ -26,9 +26,7 @@ jobs:
 
       - name: Run mutation testing for all-is-cubes
         timeout-minutes: 60
-        # TODO: maybe un-exclude fmt()
-        # TODO: maybe un-exclude content once we are out of more important things (it's hard to test thoroughly)
-        run: cargo mutants --package all-is-cubes --exclude-re '::content::' --exclude-re '<impl Arbitrary for ' --exclude-re '::fmt ->' --exclude tests.rs -- --all-features
+        run: cargo mutants --package all-is-cubes -- --all-features
         # TODO: Other crates' reasons for non-inclusion:
         #   all-is-cubes-content: insufficient test coverage
         #   all-is-cubes-desktop: insufficient test coverage, unclear if even feasible