func(vm): add unit test for eip-7823

Author: ouy95917

framework/src/test/java/org/tron/common/runtime/vm/AllowTvmOsakaTest.java

@@ -0,0 +1,47 @@
+package org.tron.common.runtime.vm;
+
+import lombok.extern.slf4j.Slf4j;
+import org.junit.Assert;
+import org.junit.Test;
+import org.tron.common.utils.ByteUtil;
+import org.tron.core.vm.PrecompiledContracts;
+import org.tron.core.vm.config.ConfigLoader;
+import org.tron.core.vm.config.VMConfig;
+import org.tron.core.vm.program.Program;
+
+@Slf4j
+public class AllowTvmOsakaTest extends VMTestBase {
+
+  @Test
+  public void testEIP7823() {
+    ConfigLoader.disable = true;
+    VMConfig.initAllowTvmOsaka(1);
+
+    byte[] baseLen = new byte[32];
+    byte[] expLen = new byte[32];
+    byte[] modLen = new byte[32];
+
+    PrecompiledContracts.PrecompiledContract modExp = new PrecompiledContracts.ModExp();
+
+    // Valid lens
+    try {
+      modExp.execute(ByteUtil.merge(baseLen, expLen, modLen));
+    } catch (Exception e) {
+      Assert.fail();
+    }
+
+    // Invalid lens
+    try {
+      baseLen[0] = 0x01;
+      modExp.execute(ByteUtil.merge(baseLen, expLen, modLen));
+    } catch (Exception e) {
+      Assert.assertTrue(e instanceof Program.PrecompiledContractException);
+      return;
+    } finally {
+      VMConfig.initAllowTvmOsaka(0);
+      ConfigLoader.disable = false;
+    }
+
+    Assert.fail();
+  }
+}