Add more test cases for clang-doc failures

Author: snarang181

clang-tools-extra/test/clang-doc/invalid-options.cpp

@@ -1,9 +1,24 @@
-/// Invalid output path (%t is a file, not a directory)
+/// Invalid output path (%t is a file, not a directory).
 // RUN: rm -rf %t && touch %t
 // RUN: not clang-doc %s -output=%t/subdir 2>&1 | FileCheck %s
 // CHECK: clang-doc error:
 // CHECK: {{(Not a directory|no such file or directory)}}
 
-/// Invalid format option
+/// Invalid format option.
 // RUN: not clang-doc %s -format=badformat 2>&1 | FileCheck %s --check-prefix=BAD-FORMAT
 // BAD-FORMAT: clang-doc: for the --format option: Cannot find option named 'badformat'!
+
+/// Missing HTML asset directory (warning only).
+// RUN: clang-doc %s -format=html -asset=%t/nonexistent-assets 2>&1 | FileCheck %s --check-prefix=ASSET-WARN
+// ASSET-WARN: Asset path supply is not a directory
+// ASSET-WARN: falling back to default
+
+/// Mapping failure (with --ignore-map-errors=false).
+// RUN: not clang-doc %t/nonexistent.cpp -ignore-map-errors=false 2>&1 | FileCheck %s --check-prefix=MAP-FAIL
+// MAP-FAIL: clang-doc error: Failed to run action
+
+/// Mapping failure (with --ignore-map-errors=true).
+// RUN: clang-doc %t/nonexistent.cpp 2>&1 | FileCheck %s --check-prefix=MAP-WARN
+// MAP-WARN: Error mapping decls in files. Clang-doc will ignore these files and continue
+
+///TODO: Add tests for failures in generateDocs() and in createResources().