Add cibuildwheel test command

Author: kleisauke

pyvips-binary/pyproject.toml

@@ -3,6 +3,7 @@ requires = [
     # First version of setuptools to support pyproject.toml configuration
     "setuptools>=61.0.0",
     "wheel",
+    # Must be kept in sync with `project.dependencies`
     "cffi>=1.0.0",
     "pkgconfig>=1.5",
 ]
@@ -38,6 +39,10 @@ classifiers = [
     "Programming Language :: Python :: Implementation :: CPython",
     "Programming Language :: Python :: Implementation :: PyPy",
 ]
+dependencies = [
+    # Must be kept in sync with `build-system.requires`
+    "cffi>=1.0.0",
+]
 
 [tool.setuptools]
 include-package-data = false
@@ -54,6 +59,7 @@ build = [
 ]
 build-frontend = "build"
 before-build = "bash {package}/scripts/cibw_before_build.sh"
+test-command = "python -c \"import _libvips; assert _libvips.lib.vips_version(0) == 8\""
 environment-pass = ["RUNNER_OS"]
 
 [tool.cibuildwheel.environment]