fix: Issue #2109 true and false value parsed as column instead of BooleanValue (#2110)

Co-authored-by: Luca Rota <[email protected]>

Author: lucarota

src/main/java/net/sf/jsqlparser/expression/BooleanValue.java

@@ -0,0 +1,74 @@
+/*-
+ * #%L
+ * JSQLParser library
+ * %%
+ * Copyright (C) 2004 - 2024 JSQLParser
+ * %%
+ * Dual licensed under GNU LGPL 2.1 or Apache License 2.0
+ * #L%
+ */
+package net.sf.jsqlparser.expression;
+
+import net.sf.jsqlparser.parser.ASTNodeAccessImpl;
+
+import java.util.Objects;
+
+/**
+ * A boolean value true/false
+ */
+public final class BooleanValue extends ASTNodeAccessImpl implements Expression {
+
+    private boolean value = false;
+
+    public BooleanValue() {
+        // empty constructor
+    }
+
+    public BooleanValue(String value) {
+        this(Boolean.parseBoolean(value));
+    }
+
+    public BooleanValue(boolean bool) {
+        value = bool;
+    }
+
+    public boolean getValue() {
+        return value;
+    }
+
+    public void setValue(boolean bool) {
+        value = bool;
+    }
+
+    @Override
+    public <T, S> T accept(ExpressionVisitor<T> expressionVisitor, S context) {
+        return expressionVisitor.visit(this, context);
+    }
+
+    @Override
+    public String toString() {
+        return Boolean.toString(value);
+    }
+
+    public BooleanValue withValue(boolean bool) {
+        this.setValue(bool);
+        return this;
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) {
+            return true;
+        }
+        if (o == null || getClass() != o.getClass()) {
+            return false;
+        }
+        BooleanValue that = (BooleanValue) o;
+        return Objects.equals(value, that.value);
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(value);
+    }
+}

src/main/java/net/sf/jsqlparser/expression/ExpressionVisitor.java

@@ -147,6 +147,12 @@ default void visit(StringValue stringValue) {
         this.visit(stringValue, null);
     }
 
+    <S> T visit(BooleanValue booleanValue, S context);
+
+    default void visit(BooleanValue booleanValue) {
+        this.visit(booleanValue, null);
+    }
+
     <S> T visit(Addition addition, S context);
 
     default void visit(Addition addition) {

src/main/java/net/sf/jsqlparser/expression/ExpressionVisitorAdapter.java

@@ -156,6 +156,11 @@ public <S> T visit(StringValue stringValue, S context) {
         return visitExpression(stringValue, context);
     }
 
+    @Override
+    public <S> T visit(BooleanValue booleanValue, S context) {
+        return visitExpression(booleanValue, context);
+    }
+
     @Override
     public <S> T visit(Addition addition, S context) {
         return visitBinaryExpression(addition, context);

src/main/java/net/sf/jsqlparser/parser/ParserKeywordsUtils.java

@@ -68,6 +68,7 @@ public class ParserKeywordsUtils {
             {"EXCEPT", RESTRICTED_SQL2016},
             {"EXCLUDES", RESTRICTED_JSQLPARSER},
             {"EXISTS", RESTRICTED_SQL2016},
+            {"FALSE", RESTRICTED_SQL2016},
             {"FETCH", RESTRICTED_SQL2016},
             {"FINAL", RESTRICTED_JSQLPARSER},
             {"FOR", RESTRICTED_SQL2016},
@@ -131,6 +132,7 @@ public class ParserKeywordsUtils {
             {"TABLES", RESTRICTED_ALIAS},
             {"TOP", RESTRICTED_SQL2016},
             {"TRAILING", RESTRICTED_SQL2016},
+            {"TRUE", RESTRICTED_SQL2016},
             {"UNBOUNDED", RESTRICTED_JSQLPARSER},
             {"UNION", RESTRICTED_SQL2016},
             {"UNIQUE", RESTRICTED_SQL2016},

src/main/java/net/sf/jsqlparser/util/TablesNamesFinder.java

@@ -16,6 +16,7 @@
 import net.sf.jsqlparser.expression.ArrayConstructor;
 import net.sf.jsqlparser.expression.ArrayExpression;
 import net.sf.jsqlparser.expression.BinaryExpression;
+import net.sf.jsqlparser.expression.BooleanValue;
 import net.sf.jsqlparser.expression.CaseExpression;
 import net.sf.jsqlparser.expression.CastExpression;
 import net.sf.jsqlparser.expression.CollateExpression;
@@ -626,6 +627,12 @@ public <S> Void visit(StringValue stringValue, S context) {
         return null;
     }
 
+    @Override
+    public <S> Void visit(BooleanValue booleanValue, S context) {
+
+        return null;
+    }
+
     @Override
     public <S> Void visit(Subtraction subtraction, S context) {
         visitBinaryExpression(subtraction);

src/main/java/net/sf/jsqlparser/util/deparser/ExpressionDeParser.java

@@ -16,6 +16,7 @@
 import net.sf.jsqlparser.expression.ArrayConstructor;
 import net.sf.jsqlparser.expression.ArrayExpression;
 import net.sf.jsqlparser.expression.BinaryExpression;
+import net.sf.jsqlparser.expression.BooleanValue;
 import net.sf.jsqlparser.expression.CaseExpression;
 import net.sf.jsqlparser.expression.CastExpression;
 import net.sf.jsqlparser.expression.CollateExpression;
@@ -621,6 +622,13 @@ public <S> StringBuilder visit(StringValue stringValue, S context) {
         return buffer;
     }
 
+    @Override
+    public <S> StringBuilder visit(BooleanValue booleanValue, S context) {
+        buffer.append(booleanValue.getValue());
+
+        return buffer;
+    }
+
     @Override
     public <S> StringBuilder visit(Subtraction subtraction, S context) {
         deparse(subtraction, " - ", null);
@@ -749,6 +757,10 @@ public void visit(StringValue stringValue) {
         visit(stringValue, null);
     }
 
+    public void visit(BooleanValue booleanValue) {
+        visit(booleanValue, null);
+    }
+
     public void visit(Subtraction subtraction) {
         visit(subtraction, null);
     }

src/main/java/net/sf/jsqlparser/util/validation/validator/ExpressionValidator.java

@@ -15,6 +15,7 @@
 import net.sf.jsqlparser.expression.ArrayConstructor;
 import net.sf.jsqlparser.expression.ArrayExpression;
 import net.sf.jsqlparser.expression.BinaryExpression;
+import net.sf.jsqlparser.expression.BooleanValue;
 import net.sf.jsqlparser.expression.CaseExpression;
 import net.sf.jsqlparser.expression.CastExpression;
 import net.sf.jsqlparser.expression.CollateExpression;
@@ -486,6 +487,12 @@ public <S> Void visit(StringValue stringValue, S context) {
         return null;
     }
 
+    @Override
+    public <S> Void visit(BooleanValue booleanValue, S context) {
+        // nothing to validate
+        return null;
+    }
+
     @Override
     public <S> Void visit(Subtraction subtraction, S context) {
         visitBinaryExpression(subtraction, " - ");
@@ -620,6 +627,10 @@ public void visit(StringValue stringValue) {
         visit(stringValue, null);
     }
 
+    public void visit(BooleanValue booleanValue) {
+        visit(booleanValue, null);
+    }
+
     public void visit(Subtraction subtraction) {
         visit(subtraction, null);
     }

src/main/jjtree/net/sf/jsqlparser/parser/JSqlParserCC.jjt

@@ -2022,7 +2022,7 @@ String RelObjectNameWithoutValue() :
 {    Token tk = null; }
 {
     ( tk=<DATA_TYPE> | tk=<S_IDENTIFIER> | tk=<S_QUOTED_IDENTIFIER> |  tk=<K_DATE_LITERAL> | tk=<K_DATETIMELITERAL> | tk=<K_STRING_FUNCTION_NAME> | tk=<K_ISOLATION> | tk=<K_TIME_KEY_EXPR> | tk=<K_TEXT_LITERAL> 
-       | tk="ACTION" | tk="ACTIVE" | tk="ADD" | tk="ADVANCE" | tk="ADVISE" | tk="AGAINST" | tk="ALGORITHM" | tk="ALTER" | tk="ANALYZE" | tk="APPLY" | tk="APPROXIMATE" | tk="ARCHIVE" | tk="ARRAY" | tk="ASC" | tk="AT" | tk="AUTHORIZATION" | tk="AUTO" | tk="BASE64" | tk="BEGIN" | tk="BERNOULLI" | tk="BINARY" | tk="BIT" | tk="BLOCK" | tk="BROWSE" | tk="BUFFERS" | tk="BY" | tk="BYTE" | tk="BYTES" | tk="CACHE" | tk="CALL" | tk="CASCADE" | tk="CASE" | tk="CAST" | tk="CHANGE" | tk="CHANGES" | tk="CHAR" | tk="CHARACTER" | tk="CHECKPOINT" | tk="CLOSE" | tk="COLLATE" | tk="COLUMN" | tk="COLUMNS" | tk="COMMENT" | tk="COMMIT" | tk="CONCURRENTLY" | tk="CONFLICT" | tk="CONSTRAINTS" | tk="CONVERT" | tk="COSTS" | tk="COUNT" | tk="CS" | tk="CYCLE" | tk="DATA" | tk="DATABASE" | tk="DATETIME" | tk="DBA_RECYCLEBIN" | tk="DDL" | tk="DECLARE" | tk="DEFERRABLE" | tk="DELAYED" | tk="DELETE" | tk="DESC" | tk="DESCRIBE" | tk="DISABLE" | tk="DISCONNECT" | tk="DIV" | tk="DML" | tk="DO" | tk="DOMAIN" | tk="DROP" | tk="DUMP" | tk="DUPLICATE" | tk="ELEMENTS" | tk="EMIT" | tk="ENABLE" | tk="END" | tk="ENGINE" | tk="ERROR" | tk="ESCAPE" | tk="EXCLUDE" | tk="EXEC" | tk="EXECUTE" | tk="EXPLAIN" | tk="EXPLICIT" | tk="EXTENDED" | tk="EXTRACT" | tk="FALSE" | tk="FILTER" | tk="FIRST" | tk="FLUSH" | tk="FN" | tk="FOLLOWING" | tk="FORMAT" | tk="FULLTEXT" | tk="FUNCTION" | tk="GRANT" | tk="GROUP_CONCAT" | tk="GUARD" | tk="HASH" | tk="HIGH_PRIORITY" | tk="HISTORY" | tk="HOPPING" | tk="INCLUDE" | tk="INCLUDE_NULL_VALUES" | tk="INCREMENT" | tk="INDEX" | tk="INSERT" | tk="INTERLEAVE" | tk="INTERPRET" | tk="INVALIDATE" | tk="ISNULL" | tk="JSON" | tk="JSON_ARRAY" | tk="JSON_ARRAYAGG" | tk="JSON_OBJECT" | tk="JSON_OBJECTAGG" | tk="KEEP" | tk="KEY" | tk="KEYS" | tk="LAST" | tk="LEADING" | tk="LESS" | tk="LINK" | tk="LOCAL" | tk="LOCK" | tk="LOCKED" | tk="LOG" | tk="LONGTEXT" | tk="LOOP" | tk="LOW_PRIORITY" | tk="MATCH" | tk="MATCHED" | tk="MATERIALIZED" | tk="MAX" | tk="MAXVALUE" | tk="MEDIUMTEXT" | tk="MEMBER" | tk="MERGE" | tk="MIN" | tk="MINVALUE" | tk="MODIFY" | tk="MOVEMENT" | tk="NEXT" | tk="NO" | tk="NOCACHE" | tk="NOKEEP" | tk="NOLOCK" | tk="NOMAXVALUE" | tk="NOMINVALUE" | tk="NOORDER" | tk="NOTHING" | tk="NOTNULL" | tk="NOVALIDATE" | tk="NOWAIT" | tk="NULLS" | tk="OF" | tk="OFF" | tk="OPEN" | tk="OVER" | tk="OVERFLOW" | tk="OVERLAPS" | tk="PARALLEL" | tk="PARENT" | tk="PARTITION" | tk="PATH" | tk="PERCENT" | tk="PLACING" | tk="PLAN" | tk="PRECEDING" | tk="PRIMARY" | tk="PURGE" | tk="QUERY" | tk="QUICK" | tk="QUIESCE" | tk="RANGE" | tk="RAW" | tk="READ" | tk="RECURSIVE" | tk="RECYCLEBIN" | tk="REFERENCES" | tk="REFRESH" | tk="REGEXP" | tk="REGEXP_LIKE" | tk="REGISTER" | tk="REMOTE" | tk="RENAME" | tk="REPEATABLE" | tk="REPLACE" | tk="RESET" | tk="RESPECT" | tk="RESTART" | tk="RESTRICT" | tk="RESTRICTED" | tk="RESUMABLE" | tk="RESUME" | tk="RETURN" | tk="RLIKE" | tk="ROLLBACK" | tk="ROLLUP" | tk="ROOT" | tk="ROW" | tk="ROWS" | tk="RR" | tk="RS" | tk="SAFE_CAST" | tk="SAVEPOINT" | tk="SCHEMA" | tk="SECURE" | tk="SEED" | tk="SEPARATOR" | tk="SEQUENCE" | tk="SESSION" | tk="SETS" | tk="SHARE" | tk="SHOW" | tk="SHUTDOWN" | tk="SIBLINGS" | tk="SIGNED" | tk="SIMILAR" | tk="SIZE" | tk="SKIP" | tk="STORED" | tk="STRING" | tk="STRUCT" | tk="SUMMARIZE" | tk="SUSPEND" | tk="SWITCH" | tk="SYNONYM" | tk="SYSTEM" | tk="TABLE" | tk="TABLESPACE" | tk="TEMP" | tk="TEMPORARY" | tk="TEXT" | tk="THAN" | tk="THEN" | tk="TIMEOUT" | tk="TIMESTAMPTZ" | tk="TIMEZONE" | tk="TINYTEXT" | tk="TO" | tk="TRIGGER" | tk="TRUE" | tk="TRUNCATE" | tk="TRY_CAST" | tk="TUMBLING" | tk="TYPE" | tk="UNLOGGED" | tk="UNQIESCE" | tk="UNSIGNED" | tk="UPDATE" | tk="UPSERT" | tk="UR" | tk="USER" | tk="VALIDATE" | tk="VERBOSE" | tk="VIEW" | tk="VOLATILE" | tk="WAIT" | tk="WITHIN" | tk="WITHOUT" | tk="WITHOUT_ARRAY_WRAPPER" | tk="WORK" | tk="XML" | tk="XMLAGG" | tk="XMLDATA" | tk="XMLSCHEMA" | tk="XMLTEXT" | tk="XSINIL" | tk="YAML" | tk="YES" | tk="ZONE" )
+       | tk="ACTION" | tk="ACTIVE" | tk="ADD" | tk="ADVANCE" | tk="ADVISE" | tk="AGAINST" | tk="ALGORITHM" | tk="ALTER" | tk="ANALYZE" | tk="APPLY" | tk="APPROXIMATE" | tk="ARCHIVE" | tk="ARRAY" | tk="ASC" | tk="AT" | tk="AUTHORIZATION" | tk="AUTO" | tk="BASE64" | tk="BEGIN" | tk="BERNOULLI" | tk="BINARY" | tk="BIT" | tk="BLOCK" | tk="BROWSE" | tk="BUFFERS" | tk="BY" | tk="BYTE" | tk="BYTES" | tk="CACHE" | tk="CALL" | tk="CASCADE" | tk="CASE" | tk="CAST" | tk="CHANGE" | tk="CHANGES" | tk="CHAR" | tk="CHARACTER" | tk="CHECKPOINT" | tk="CLOSE" | tk="COLLATE" | tk="COLUMN" | tk="COLUMNS" | tk="COMMENT" | tk="COMMIT" | tk="CONCURRENTLY" | tk="CONFLICT" | tk="CONSTRAINTS" | tk="CONVERT" | tk="COSTS" | tk="COUNT" | tk="CS" | tk="CYCLE" | tk="DATA" | tk="DATABASE" | tk="DATETIME" | tk="DBA_RECYCLEBIN" | tk="DDL" | tk="DECLARE" | tk="DEFERRABLE" | tk="DELAYED" | tk="DELETE" | tk="DESC" | tk="DESCRIBE" | tk="DISABLE" | tk="DISCONNECT" | tk="DIV" | tk="DML" | tk="DO" | tk="DOMAIN" | tk="DROP" | tk="DUMP" | tk="DUPLICATE" | tk="ELEMENTS" | tk="EMIT" | tk="ENABLE" | tk="END" | tk="ENGINE" | tk="ERROR" | tk="ESCAPE" | tk="EXCLUDE" | tk="EXEC" | tk="EXECUTE" | tk="EXPLAIN" | tk="EXPLICIT" | tk="EXTENDED" | tk="EXTRACT" | tk="FILTER" | tk="FIRST" | tk="FLUSH" | tk="FN" | tk="FOLLOWING" | tk="FORMAT" | tk="FULLTEXT" | tk="FUNCTION" | tk="GRANT" | tk="GROUP_CONCAT" | tk="GUARD" | tk="HASH" | tk="HIGH_PRIORITY" | tk="HISTORY" | tk="HOPPING" | tk="INCLUDE" | tk="INCLUDE_NULL_VALUES" | tk="INCREMENT" | tk="INDEX" | tk="INSERT" | tk="INTERLEAVE" | tk="INTERPRET" | tk="INVALIDATE" | tk="ISNULL" | tk="JSON" | tk="JSON_ARRAY" | tk="JSON_ARRAYAGG" | tk="JSON_OBJECT" | tk="JSON_OBJECTAGG" | tk="KEEP" | tk="KEY" | tk="KEYS" | tk="LAST" | tk="LEADING" | tk="LESS" | tk="LINK" | tk="LOCAL" | tk="LOCK" | tk="LOCKED" | tk="LOG" | tk="LONGTEXT" | tk="LOOP" | tk="LOW_PRIORITY" | tk="MATCH" | tk="MATCHED" | tk="MATERIALIZED" | tk="MAX" | tk="MAXVALUE" | tk="MEDIUMTEXT" | tk="MEMBER" | tk="MERGE" | tk="MIN" | tk="MINVALUE" | tk="MODIFY" | tk="MOVEMENT" | tk="NEXT" | tk="NO" | tk="NOCACHE" | tk="NOKEEP" | tk="NOLOCK" | tk="NOMAXVALUE" | tk="NOMINVALUE" | tk="NOORDER" | tk="NOTHING" | tk="NOTNULL" | tk="NOVALIDATE" | tk="NOWAIT" | tk="NULLS" | tk="OF" | tk="OFF" | tk="OPEN" | tk="OVER" | tk="OVERFLOW" | tk="OVERLAPS" | tk="PARALLEL" | tk="PARENT" | tk="PARTITION" | tk="PATH" | tk="PERCENT" | tk="PLACING" | tk="PLAN" | tk="PRECEDING" | tk="PRIMARY" | tk="PURGE" | tk="QUERY" | tk="QUICK" | tk="QUIESCE" | tk="RANGE" | tk="RAW" | tk="READ" | tk="RECURSIVE" | tk="RECYCLEBIN" | tk="REFERENCES" | tk="REFRESH" | tk="REGEXP" | tk="REGEXP_LIKE" | tk="REGISTER" | tk="REMOTE" | tk="RENAME" | tk="REPEATABLE" | tk="REPLACE" | tk="RESET" | tk="RESPECT" | tk="RESTART" | tk="RESTRICT" | tk="RESTRICTED" | tk="RESUMABLE" | tk="RESUME" | tk="RETURN" | tk="RLIKE" | tk="ROLLBACK" | tk="ROLLUP" | tk="ROOT" | tk="ROW" | tk="ROWS" | tk="RR" | tk="RS" | tk="SAFE_CAST" | tk="SAVEPOINT" | tk="SCHEMA" | tk="SECURE" | tk="SEED" | tk="SEPARATOR" | tk="SEQUENCE" | tk="SESSION" | tk="SETS" | tk="SHARE" | tk="SHOW" | tk="SHUTDOWN" | tk="SIBLINGS" | tk="SIGNED" | tk="SIMILAR" | tk="SIZE" | tk="SKIP" | tk="STORED" | tk="STRING" | tk="STRUCT" | tk="SUMMARIZE" | tk="SUSPEND" | tk="SWITCH" | tk="SYNONYM" | tk="SYSTEM" | tk="TABLE" | tk="TABLESPACE" | tk="TEMP" | tk="TEMPORARY" | tk="TEXT" | tk="THAN" | tk="THEN" | tk="TIMEOUT" | tk="TIMESTAMPTZ" | tk="TIMEZONE" | tk="TINYTEXT" | tk="TO" | tk="TRIGGER" | tk="TRUNCATE" | tk="TRY_CAST" | tk="TUMBLING" | tk="TYPE" | tk="UNLOGGED" | tk="UNQIESCE" | tk="UNSIGNED" | tk="UPDATE" | tk="UPSERT" | tk="UR" | tk="USER" | tk="VALIDATE" | tk="VERBOSE" | tk="VIEW" | tk="VOLATILE" | tk="WAIT" | tk="WITHIN" | tk="WITHOUT" | tk="WITHOUT_ARRAY_WRAPPER" | tk="WORK" | tk="XML" | tk="XMLAGG" | tk="XMLDATA" | tk="XMLSCHEMA" | tk="XMLTEXT" | tk="XSINIL" | tk="YAML" | tk="YES" | tk="ZONE" )
     { return tk.image; }
 }
 
@@ -4786,7 +4786,7 @@ Expression PrimaryExpression() #PrimaryExpression:
 
         | LOOKAHEAD(2, {!interrupted}) retval=DateTimeLiteralExpression()
 
-        | LOOKAHEAD( 3 , {!interrupted}) retval=StructType()
+        | LOOKAHEAD(3 , {!interrupted}) retval=StructType()
 
         | LOOKAHEAD(3, {!interrupted}) <K_ARRAY_LITERAL> retval=ArrayConstructor(true)
 
@@ -4800,6 +4800,8 @@ Expression PrimaryExpression() #PrimaryExpression:
 
         | LOOKAHEAD(2, {!interrupted}) retval=Column()
 
+        | LOOKAHEAD(2, {!interrupted}) (token=<K_TRUE> | token=<K_FALSE>) { retval = new BooleanValue(token.image); }
+
         | token=<S_CHAR_LITERAL> { retval = new StringValue(token.image); linkAST(retval,jjtThis); }
 
         | "{d" token=<S_CHAR_LITERAL> "}"  { retval = new DateValue(token.image); }
@@ -6750,7 +6752,7 @@ String AList():
      "("
 
      (
-       ( (tk=<S_LONG> | tk=<S_DOUBLE> | tk=<S_CHAR_LITERAL>) { retval.append(tk.image); }
+       ( (tk=<S_LONG> | tk=<S_DOUBLE> | tk=<S_CHAR_LITERAL> | tk=<K_TRUE> | tk=<K_FALSE>) { retval.append(tk.image); }
          | (name=RelObjectNameWithoutValue()) { retval.append(name); })
        [("," {retval.append(",");} | "=" {retval.append("=");})] )*
 

src/site/sphinx/keywords.rst

@@ -53,6 +53,8 @@ The following Keywords are **restricted** in JSQLParser-|JSQLPARSER_VERSION| and
 +----------------------+-------------+-----------+
 | EXISTS               | Yes         | Yes       | 
 +----------------------+-------------+-----------+
+| FALSE                | Yes         | Yes       | 
++----------------------+-------------+-----------+
 | FETCH                | Yes         | Yes       | 
 +----------------------+-------------+-----------+
 | FINAL                | Yes         | Yes       | 
@@ -179,6 +181,8 @@ The following Keywords are **restricted** in JSQLParser-|JSQLPARSER_VERSION| and
 +----------------------+-------------+-----------+
 | TRAILING             | Yes         | Yes       | 
 +----------------------+-------------+-----------+
+| TRUE                 | Yes         | Yes       | 
++----------------------+-------------+-----------+
 | UNBOUNDED            | Yes         | Yes       | 
 +----------------------+-------------+-----------+
 | UNION                | Yes         | Yes       | 

src/test/java/net/sf/jsqlparser/expression/BooleanValueTest.java

@@ -0,0 +1,49 @@
+/*-
+ * #%L
+ * JSQLParser library
+ * %%
+ * Copyright (C) 2004 - 2024 JSQLParser
+ * %%
+ * Dual licensed under GNU LGPL 2.1 or Apache License 2.0
+ * #L%
+ */
+package net.sf.jsqlparser.expression;
+
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+/**
+ *
+ * @author tw
+ */
+public class BooleanValueTest {
+
+    @Test
+    public void testTrueValue() {
+        BooleanValue value = new BooleanValue("true");
+
+        assertTrue(value.getValue());
+    }
+
+    @Test
+    public void testFalseValue() {
+        BooleanValue value = new BooleanValue("false");
+
+        assertFalse(value.getValue());
+    }
+
+    @Test
+    public void testWrongValueAsFalseLargeNumber() {
+        BooleanValue value = new BooleanValue("test");
+
+        assertFalse(value.getValue());
+    }
+
+    @Test
+    public void testNullStringValue() {
+        BooleanValue value = new BooleanValue(null);
+
+        assertFalse(value.getValue());
+    }
+}