test: add unit tests for cache.c

.github/workflows/build-platforms.yml

@@ -60,6 +60,14 @@ jobs:
           meson setup build ${{ matrix.buildtype && format('--buildtype={0}', matrix.buildtype) || '' }}
           ninja -C build
 
+      - name: Run unit tests
+        if: matrix.run_tests
+        run: |
+          set -o pipefail
+          meson test -C build --suite unit --print-errorlogs -v | tee "$RUNNER_TEMP/unit-tests.log"
+          # meson exits 0 when no test matches the suite, so insist on a pass
+          grep -Eiq '^ok: +[1-9]' "$RUNNER_TEMP/unit-tests.log"
+
       - name: Setup SSH
         if: matrix.run_tests
         run: |

.github/workflows/build-ubuntu.yml

@@ -83,6 +83,13 @@ jobs:
           path: build/sshfs
           if-no-files-found: ignore
 
+      - name: Run unit tests
+        run: |
+          set -o pipefail
+          meson test -C build --suite unit --print-errorlogs -v | tee "$RUNNER_TEMP/unit-tests.log"
+          # meson exits 0 when no test matches the suite, so insist on a pass
+          grep -Eiq '^ok: +[1-9]' "$RUNNER_TEMP/unit-tests.log"
+
       - name: Run tests
         timeout-minutes: 20
         run: |

.github/workflows/sanitizers.yml

@@ -79,6 +79,10 @@ jobs:
           ASAN_SYMBOLIZER_PATH: /usr/bin/llvm-symbolizer
         run: |
           mkdir -p "$RUNNER_TEMP/sanitizer"
+          set -o pipefail
+          meson test -C build --suite unit --print-errorlogs -v | tee "$RUNNER_TEMP/unit-tests.log"
+          # meson exits 0 when no test matches the suite, so insist on a pass
+          grep -Eiq '^ok: +[1-9]' "$RUNNER_TEMP/unit-tests.log"
           cd build
           python3 -m pytest test/ --timeout=180 --maxfail=99 --junitxml=test-results.xml
         timeout-minutes: 20

test/meson.build

@@ -5,6 +5,17 @@ custom_target('test_scripts', input: test_scripts,
               command: ['cp', '-fPp',
                         '@INPUT@', meson.current_build_dir() ])
 
+# Unit tests for cache.c.  The test #includes cache.c itself, so it is built
+# from its own source only.  They need no mount and are in the 'unit' suite.
+# Run them with 'meson test --suite unit': the wrong_cmd test below always
+# fails, so a plain 'meson test' does too.
+test_cache = executable('test_cache', 'test_cache.c',
+                        include_directories: include_dirs,
+                        dependencies: sshfs_deps,
+                        c_args: ['-DFUSE_USE_VERSION=31'],
+                        install: false)
+test('cache', test_cache, suite: 'unit')
+
 # Provide something helpful when running 'ninja test'
 wrong_cmd = executable('wrong_command', 'wrong_command.c',
                        install: false)