fix test for CVC4 with exception

Author: kfriedberger

src/org/sosy_lab/java_smt/test/StringFormulaManagerTest.java

@@ -184,8 +184,8 @@ public void testRegexAllCharUnicode() throws SolverException, InterruptedExcepti
     BooleanFormula inRange2 = smgr.in(x, smgr.intersection(smgr.range('a', 'Δ'), regexAllChar));
     if (solverToUse() == Solvers.CVC4) {
       // CVC4 has issues with range and special Unicode characters when solving constraints
-      assertThrows(SolverException.class, () -> assertThatFormula(inRange).isSatisfiable());
-      assertThrows(SolverException.class, () -> assertThatFormula(inRange2).isSatisfiable());
+      assertThrows(AssertionError.class, () -> assertThatFormula(inRange).isSatisfiable());
+      assertThrows(AssertionError.class, () -> assertThatFormula(inRange2).isSatisfiable());
     } else {
       assertThatFormula(inRange).isSatisfiable();
       assertThatFormula(inRange2).isSatisfiable();