Reject non-finite CLI float inputs

tests/CMakeLists.txt

@@ -329,6 +329,15 @@ if(TARGET pano_cli)
     set_tests_properties(pano_cli_save_project_payload_roundtrip_smoke PROPERTIES
         LABELS "assets;document;integration;desktop-fast")
 
+    add_test(NAME pano_cli_save_project_rejects_non_finite_opacity
+        COMMAND "${CMAKE_COMMAND}"
+            -DPANO_CLI=$<TARGET_FILE:pano_cli>
+            -DOUTPUT_PATH=${CMAKE_CURRENT_BINARY_DIR}/data/generated/rejected-non-finite-opacity.ppi
+            "-DEXPECTED_OUTPUT=floating-point value must be finite"
+            -P "${CMAKE_CURRENT_SOURCE_DIR}/cmake/expect_pano_cli_save_project_failure.cmake")
+    set_tests_properties(pano_cli_save_project_rejects_non_finite_opacity PROPERTIES
+        LABELS "assets;document;integration;desktop-fast;fuzz")
+
     add_test(NAME pano_cli_save_document_project_roundtrip_smoke
         COMMAND "${CMAKE_COMMAND}"
             -DPANO_CLI=$<TARGET_FILE:pano_cli>

tests/cmake/expect_pano_cli_save_project_failure.cmake

@@ -0,0 +1,36 @@
+if(NOT DEFINED PANO_CLI)
+    message(FATAL_ERROR "PANO_CLI is required")
+endif()
+
+if(NOT DEFINED OUTPUT_PATH)
+    message(FATAL_ERROR "OUTPUT_PATH is required")
+endif()
+
+if(NOT DEFINED EXPECTED_OUTPUT)
+    message(FATAL_ERROR "EXPECTED_OUTPUT is required")
+endif()
+
+file(REMOVE "${OUTPUT_PATH}")
+
+execute_process(
+    COMMAND "${PANO_CLI}" save-project
+        --path "${OUTPUT_PATH}"
+        --width 64
+        --height 32
+        --layer-opacity nan
+    RESULT_VARIABLE save_result
+    OUTPUT_VARIABLE save_output
+    ERROR_VARIABLE save_error)
+
+if(save_result EQUAL 0)
+    message(FATAL_ERROR "save-project unexpectedly succeeded: ${save_output}${save_error}")
+endif()
+
+string(FIND "${save_output}${save_error}" "${EXPECTED_OUTPUT}" expected_index)
+if(expected_index EQUAL -1)
+    message(FATAL_ERROR "save-project failure did not contain expected output: ${save_output}${save_error}")
+endif()
+
+if(EXISTS "${OUTPUT_PATH}")
+    message(FATAL_ERROR "save-project created output despite rejected inputs: ${OUTPUT_PATH}")
+endif()