Add regression tests for CJK characters

.github/workflows/test.yml

@@ -154,3 +154,142 @@ jobs:
         }
         Write-Host "Successfully downloaded artifact without decompressing: $rawFile (size: $($fileInfo.Length) bytes)"
       shell: pwsh
+
+    # Test uploading and downloading artifacts with CJK (Chinese, Japanese, Korean) characters
+    # Regression test: certain non-ASCII chars (e.g. U+571F 土) caused 400 errors from
+    # Azure Blob Storage due to encoding issues in the Content-Disposition / rscd parameter
+    - name: Create artifacts with CJK names
+      shell: bash
+      run: |
+        mkdir -p path/to/cjk-artifacts
+        # Chinese - 土 (U+571F) known to fail, 日 (U+65E5) known to work
+        echo "Content for 土" > path/to/cjk-artifacts/file-土.txt
+        echo "Content for 中文测试" > path/to/cjk-artifacts/file-中文测试.txt
+        # Japanese - katakana and kanji
+        echo "Content for テスト" > path/to/cjk-artifacts/file-テスト.txt
+        echo "Content for 東京タワー" > path/to/cjk-artifacts/file-東京タワー.txt
+        # Korean - Hangul
+        echo "Content for 테스트" > path/to/cjk-artifacts/file-테스트.txt
+        echo "Content for 서울시" > path/to/cjk-artifacts/file-서울시.txt
+
+    - name: Upload CJK artifact - Chinese 土
+      uses: actions/upload-artifact@v7
+      with:
+        name: CJK-土-${{ matrix.runs-on }}
+        path: path/to/cjk-artifacts/file-土.txt
+        archive: false
+
+    - name: Upload CJK artifact - Chinese 中文测试
+      uses: actions/upload-artifact@v7
+      with:
+        name: CJK-中文测试-${{ matrix.runs-on }}
+        path: path/to/cjk-artifacts/file-中文测试.txt
+        archive: false
+
+    - name: Upload CJK artifact - Japanese テスト
+      uses: actions/upload-artifact@v7
+      with:
+        name: CJK-テスト-${{ matrix.runs-on }}
+        path: path/to/cjk-artifacts/file-テスト.txt
+        archive: false
+
+    - name: Upload CJK artifact - Japanese 東京タワー
+      uses: actions/upload-artifact@v7
+      with:
+        name: CJK-東京タワー-${{ matrix.runs-on }}
+        path: path/to/cjk-artifacts/file-東京タワー.txt
+        archive: false
+
+    - name: Upload CJK artifact - Korean 테스트
+      uses: actions/upload-artifact@v7
+      with:
+        name: CJK-테스트-${{ matrix.runs-on }}
+        path: path/to/cjk-artifacts/file-테스트.txt
+        archive: false
+
+    - name: Upload CJK artifact - Korean 서울시
+      uses: actions/upload-artifact@v7
+      with:
+        name: CJK-서울시-${{ matrix.runs-on }}
+        path: path/to/cjk-artifacts/file-서울시.txt
+        archive: false
+
+    - name: Download CJK artifact - Chinese 土
+      uses: ./
+      with:
+        name: CJK-土-${{ matrix.runs-on }}
+        path: cjk-download/土
+
+    - name: Download CJK artifact - Chinese 中文测试
+      uses: ./
+      with:
+        name: CJK-中文测试-${{ matrix.runs-on }}
+        path: cjk-download/中文测试
+
+    - name: Download CJK artifact - Japanese テスト
+      uses: ./
+      with:
+        name: CJK-テスト-${{ matrix.runs-on }}
+        path: cjk-download/テスト
+
+    - name: Download CJK artifact - Japanese 東京タワー
+      uses: ./
+      with:
+        name: CJK-東京タワー-${{ matrix.runs-on }}
+        path: cjk-download/東京タワー
+
+    - name: Download CJK artifact - Korean 테스트
+      uses: ./
+      with:
+        name: CJK-테스트-${{ matrix.runs-on }}
+        path: cjk-download/테스트
+
+    - name: Download CJK artifact - Korean 서울시
+      uses: ./
+      with:
+        name: CJK-서울시-${{ matrix.runs-on }}
+        path: cjk-download/서울시
+
+    - name: Verify CJK artifact downloads
+      shell: bash
+      run: |
+        set -e
+        fail=0
+
+        check_file() {
+          local file="$1"
+          local expected="$2"
+          if [ ! -f "$file" ]; then
+            echo "FAIL: Missing file: $file"
+            fail=1
+            return
+          fi
+          actual=$(cat "$file")
+          if [ "$actual" != "$expected" ]; then
+            echo "FAIL: Content mismatch in $file"
+            echo "  Expected: '$expected'"
+            echo "  Got:      '$actual'"
+            fail=1
+            return
+          fi
+          echo "PASS: $file"
+        }
+
+        echo "=== Chinese ==="
+        check_file "cjk-download/土/file-土.txt" "Content for 土"
+        check_file "cjk-download/中文测试/file-中文测试.txt" "Content for 中文测试"
+
+        echo "=== Japanese ==="
+        check_file "cjk-download/テスト/file-テスト.txt" "Content for テスト"
+        check_file "cjk-download/東京タワー/file-東京タワー.txt" "Content for 東京タワー"
+
+        echo "=== Korean ==="
+        check_file "cjk-download/테스트/file-테스트.txt" "Content for 테스트"
+        check_file "cjk-download/서울시/file-서울시.txt" "Content for 서울시"
+
+        if [ "$fail" -ne 0 ]; then
+          echo "Some CJK artifact checks failed"
+          ls -alR cjk-download/ || true
+          exit 1
+        fi
+        echo "All CJK artifact downloads verified successfully"