Add ExpressionDecomposerTest cases

In particular test a double-hook expression, which is what optional chains will be rewritten to be.

PiperOrigin-RevId: 321676845

Author: brad4d

test/com/google/javascript/jscomp/ExpressionDecomposerTest.java

@@ -41,8 +41,6 @@
 
 /**
  * Unit tests for {@link ExpressionDecomposer}
- *
- * @author [email protected] (John Lenz)
  */
 // Note: functions "foo" and "goo" are external functions in the helper.
 @RunWith(JUnit4.class)
@@ -630,6 +628,42 @@ public void testExposeExpression6() {
         "if (goo()) foo();");
   }
 
+  @Test
+  public void testExposeDoubleAndExpression() {
+    helperExposeExpression(
+        "a = boo() && goo() && foo()",
+        "foo",
+        lines(
+            "var temp$jscomp$0;",
+            "if (temp$jscomp$0 = boo() && goo()) {",
+            "  temp$jscomp$0 = foo();",
+            "}",
+            "a = temp$jscomp$0;",
+            ""));
+  }
+
+  @Test
+  public void testExposeDoubleHookExpression() {
+    helperExposeExpression(
+        "a = boo() ? void 0 : goo() ? void 0 : foo()",
+        "foo",
+        lines(
+            "var temp$jscomp$0;",
+            "if (boo()) {",
+            "  temp$jscomp$0 = void 0;",
+            "} else {",
+            "  var temp$jscomp$1;",
+            "  if (goo()) {",
+            "  temp$jscomp$1 = void 0;",
+            "  } else {",
+            "  temp$jscomp$1 = foo();",
+            "  }",
+            "  temp$jscomp$0 = temp$jscomp$1;",
+            "}",
+            "a = temp$jscomp$0;",
+            ""));
+  }
+
   @Test
   public void exposeExpressionNullishCoalesceNoResult() {
     helperExposeExpression(