Introduce tests for SpEL's Inc/Dec operators and polishing

spring-expression/src/test/java/org/springframework/expression/spel/ListTests.java

@@ -20,20 +20,22 @@ import java.util.ArrayList;
 import java.util.Collections;
 
 import org.junit.jupiter.api.Test;
+import org.junit.jupiter.params.ParameterizedTest;
+import org.junit.jupiter.params.provider.CsvSource;
 
 import org.springframework.expression.spel.ast.InlineList;
 import org.springframework.expression.spel.standard.SpelExpression;
-import org.springframework.expression.spel.standard.SpelExpressionParser;
 
 import static org.assertj.core.api.Assertions.assertThat;
 import static org.assertj.core.api.Assertions.assertThatExceptionOfType;
-import static org.springframework.expression.spel.SpelMessage.RESULT_OF_SELECTION_CRITERIA_IS_NOT_BOOLEAN;
+import static org.assertj.core.api.InstanceOfAssertFactories.type;
 
 /**
  * Test usage of inline lists.
  *
  * @author Andy Clement
  * @author Giovanni Dall'Oglio Risso
+ * @author Sam Brannen
  * @since 3.0.4
  */
 class ListTests extends AbstractExpressionTests {
@@ -44,49 +46,61 @@ class ListTests extends AbstractExpressionTests {
 
 
 	@Test
-	void testInlineListCreation01() {
+	void inlineListCreation() {
 		evaluate("{1, 2, 3, 4, 5}", "[1, 2, 3, 4, 5]", unmodifiableClass);
-	}
-
-	@Test
-	void testInlineListCreation02() {
 		evaluate("{'abc', 'xyz'}", "[abc, xyz]", unmodifiableClass);
-	}
-
-	@Test
-	void testInlineListCreation03() {
 		evaluate("{}", "[]", unmodifiableClass);
-	}
-
-	@Test
-	void testInlineListCreation04() {
 		evaluate("{'abc'=='xyz'}", "[false]", ArrayList.class);
 	}
 
 	@Test
-	void testInlineListAndNesting() {
+	void inlineListAndNesting() {
 		evaluate("{{1,2,3},{4,5,6}}", "[[1, 2, 3], [4, 5, 6]]", unmodifiableClass);
 		evaluate("{{1,'2',3},{4,{'a','b'},5,6}}", "[[1, 2, 3], [4, [a, b], 5, 6]]", unmodifiableClass);
 	}
 
 	@Test
-	void testInlineListError() {
+	void inlineListError() {
 		parseAndCheckError("{'abc'", SpelMessage.OOD);
 	}
 
 	@Test
-	void testRelOperatorsIs02() {
+	void inlineListAndInstanceofOperator() {
 		evaluate("{1, 2, 3, 4, 5} instanceof T(java.util.List)", "true", Boolean.class);
 	}
 
 	@Test
-	void testInlineListCreation05() {
+	void inlineListAndBetweenOperatorForIntegers() {
+		evaluate("1 between {1,5}", "true", Boolean.class);
 		evaluate("3 between {1,5}", "true", Boolean.class);
+		evaluate("5 between {1,5}", "true", Boolean.class);
+		evaluate("0 between {1,5}", "false", Boolean.class);
+		evaluate("8 between {1,5}", "false", Boolean.class);
 	}
 
 	@Test
-	void testInlineListCreation06() {
+	void inlineListAndBetweenOperatorForStrings() {
-		evaluate("8 between {1,5}", "false", Boolean.class);
+		evaluate("'a' between {'a', 'c'}", "true", Boolean.class);
+		evaluate("'b' between {'a', 'c'}", "true", Boolean.class);
+		evaluate("'c' between {'a', 'c'}", "true", Boolean.class);
+		evaluate("'z' between {'a', 'c'}", "false", Boolean.class);
+
+		evaluate("'efg' between {'abc', 'xyz'}", "true", Boolean.class);
+	}
+
+	@Test
+	void inlineListAndBetweenOperatorForBigDecimals() {
+		String oneToFive = "{new java.math.BigDecimal('1'),new java.math.BigDecimal('5')}";
+
+		evaluate("new java.math.BigDecimal('1') between " + oneToFive, "true", Boolean.class);
+		evaluate("new java.math.BigDecimal('3') between " + oneToFive, "true", Boolean.class);
+		evaluate("new java.math.BigDecimal('5') between " + oneToFive, "true", Boolean.class);
+		evaluate("new java.math.BigDecimal('8') between " + oneToFive, "false", Boolean.class);
+	}
+
+	@Test
+	void inlineListAndBetweenOperatorWithNonMatchingTypes() {
+		evaluateAndCheckError("'abc' between {5,7}", SpelMessage.NOT_COMPARABLE, 6);
 	}
 
 	@Test
@@ -108,7 +122,7 @@ class ListTests extends AbstractExpressionTests {
 
 	@Test
 	void selectionOnListWithNonBooleanSelectionCriteria() {
-		evaluateAndCheckError("listOfNumbersUpToTen.?['nonboolean']", RESULT_OF_SELECTION_CRITERIA_IS_NOT_BOOLEAN);
+		evaluateAndCheckError("listOfNumbersUpToTen.?['nonboolean']", SpelMessage.RESULT_OF_SELECTION_CRITERIA_IS_NOT_BOOLEAN);
 	}
 
 	@Test
@@ -126,67 +140,33 @@ class ListTests extends AbstractExpressionTests {
 		evaluate("new java.util.HashSet().addAll({'a','b','c'})", "true", Boolean.class);
 	}
 
-	@Test
+	@ParameterizedTest
-	void testRelOperatorsBetween01() {
+	@CsvSource(quoteCharacter = '"', delimiterString = "->", textBlock = """
-		evaluate("32 between {32, 42}", "true", Boolean.class);
+		"{1,2,3,4,5}"              -> true
-	}
+		"{'abc'}"                  -> true
+		"{}"                       -> true
 
-	@Test
+		"{#a,2,3}"                 -> false
-	void testRelOperatorsBetween02() {
+		"{1,2,Integer.valueOf(4)}" -> false
-		evaluate("'efg' between {'abc', 'xyz'}", "true", Boolean.class);
+		"{1,2,{#a}}"               -> false
-	}
+		""")
-
+	void constantRepresentation(String expression, boolean isConstant) {
-	@Test
+		SpelExpression expression1 = (SpelExpression) parser.parseExpression(expression);
-	void testRelOperatorsBetween03() {
+		assertThat(expression1.getAST()).asInstanceOf(type(InlineList.class)).satisfies(inlineList -> {
-		evaluate("42 between {32, 42}", "true", Boolean.class);
+			if (isConstant) {
-	}
-
-	@Test
-	void testRelOperatorsBetween04() {
-		evaluate("new java.math.BigDecimal('1') between {new java.math.BigDecimal('1'),new java.math.BigDecimal('5')}",
-			"true", Boolean.class);
-		evaluate("new java.math.BigDecimal('3') between {new java.math.BigDecimal('1'),new java.math.BigDecimal('5')}",
-			"true", Boolean.class);
-		evaluate("new java.math.BigDecimal('5') between {new java.math.BigDecimal('1'),new java.math.BigDecimal('5')}",
-			"true", Boolean.class);
-		evaluate("new java.math.BigDecimal('8') between {new java.math.BigDecimal('1'),new java.math.BigDecimal('5')}",
-			"false", Boolean.class);
-	}
-
-	@Test
-	void testRelOperatorsBetweenErrors02() {
-		evaluateAndCheckError("'abc' between {5,7}", SpelMessage.NOT_COMPARABLE, 6);
-	}
-
-	@Test
-	void testConstantRepresentation1() {
-		checkConstantList("{1,2,3,4,5}", true);
-		checkConstantList("{'abc'}", true);
-		checkConstantList("{}", true);
-		checkConstantList("{#a,2,3}", false);
-		checkConstantList("{1,2,Integer.valueOf(4)}", false);
-		checkConstantList("{1,2,{#a}}", false);
-	}
-
-	private void checkConstantList(String expressionText, boolean expectedToBeConstant) {
-		SpelExpressionParser parser = new SpelExpressionParser();
-		SpelExpression expression = (SpelExpression) parser.parseExpression(expressionText);
-		SpelNode node = expression.getAST();
-		boolean condition = node instanceof InlineList;
-		assertThat(condition).isTrue();
-		InlineList inlineList = (InlineList) node;
-		if (expectedToBeConstant) {
 				assertThat(inlineList.isConstant()).isTrue();
 			}
 			else {
 				assertThat(inlineList.isConstant()).isFalse();
 			}
+		});
 	}
 
 	@Test
-	void testInlineListWriting() {
+	void inlineListWriting() {
 		// list should be unmodifiable
 		assertThatExceptionOfType(UnsupportedOperationException.class).isThrownBy(() ->
 				evaluate("{1, 2, 3, 4, 5}[0]=6", "[1, 2, 3, 4, 5]", unmodifiableClass));
 	}
+
 }

spring-expression/src/test/java/org/springframework/expression/spel/ParsingTests.java

@@ -16,6 +16,7 @@
 
 package org.springframework.expression.spel;
 
+import org.junit.jupiter.api.Disabled;
 import org.junit.jupiter.api.Nested;
 import org.junit.jupiter.api.Test;
 
@@ -318,6 +319,29 @@ class ParsingTests {
 		}
 	}
 
+	@Nested
+	class StringOperators {
+
+		@Test
+		void stringConcatenation() {
+			parseCheck("'a' + 'b'", "('a' + 'b')");
+			parseCheck("'hello' + ' ' + 'world'", "(('hello' + ' ') + 'world')");
+		}
+
+		@Test
+		void characterSubtraction() {
+			parseCheck("'X' - 3", "('X' - 3)");
+			parseCheck("'X' - 2 - 1", "(('X' - 2) - 1)");
+		}
+
+		@Test
+		void stringRepeat() {
+			parseCheck("'abc' * 2", "('abc' * 2)");
+			parseCheck("'abc' * 2 * 2", "(('abc' * 2) * 2)");
+		}
+
+	}
+
 	@Nested
 	class MathematicalOperators {
 
@@ -326,16 +350,6 @@ class ParsingTests {
 			parseCheck("2+4", "(2 + 4)");
 		}
 
-		@Test
-		void mathOperatorsAddStrings() {
-			parseCheck("'a' + 'b'", "('a' + 'b')");
-		}
-
-		@Test
-		void mathOperatorsAddMultipleStrings() {
-			parseCheck("'hello' + ' ' + 'world'", "(('hello' + ' ') + 'world')");
-		}
-
 		@Test
 		void mathOperatorsSubtract() {
 			parseCheck("5-4", "(5 - 4)");
@@ -355,6 +369,32 @@ class ParsingTests {
 		void mathOperatorModulus() {
 			parseCheck("7 % 4", "(7 % 4)");
 		}
+
+		@Disabled("Disabled due to a bug in OpInc.toStringAST()")
+		@Test
+		void mathOperatorIncrementPrefix() {
+			parseCheck("++7", "++7");
+			parseCheck("++foo", "++foo");
+		}
+
+		@Test
+		void mathOperatorIncrementPostfix() {
+			parseCheck("7++", "7++");
+			parseCheck("foo++", "foo++");
+		}
+
+		@Disabled("Disabled due to a bug in OpDec.toStringAST()")
+		@Test
+		void mathOperatorDecrementPrefix() {
+			parseCheck("--7", "--7");
+			parseCheck("--foo", "--foo");
+		}
+
+		@Test
+		void mathOperatorDecrementPostfix() {
+			parseCheck("7--", "7--");
+			parseCheck("foo--", "foo--");
+		}
 	}
 
 	@Nested

spring-expression/src/test/java/org/springframework/expression/spel/SelectionAndProjectionTests.java

@@ -34,6 +34,8 @@ import org.springframework.expression.spel.standard.SpelExpressionParser;
 import org.springframework.expression.spel.support.StandardEvaluationContext;
 
 import static org.assertj.core.api.Assertions.assertThat;
+import static org.assertj.core.api.InstanceOfAssertFactories.INTEGER;
+import static org.assertj.core.api.InstanceOfAssertFactories.LIST;
 import static org.springframework.expression.spel.SpelMessage.INVALID_TYPE_FOR_SELECTION;
 import static org.springframework.expression.spel.SpelMessage.PROJECTION_NOT_SUPPORTED_ON_TYPE;
 import static org.springframework.expression.spel.SpelMessage.RESULT_OF_SELECTION_CRITERIA_IS_NOT_BOOLEAN;
@@ -94,28 +96,21 @@ class SelectionAndProjectionTests extends AbstractExpressionTests {
 	void selectionWithList() {
 		Expression expression = new SpelExpressionParser().parseRaw("integers.?[#this<5]");
 		EvaluationContext context = new StandardEvaluationContext(new ListTestBean());
-		Object value = expression.getValue(context);
+		assertThat(expression.getValue(context)).asInstanceOf(LIST).containsExactly(0, 1, 2, 3, 4);
-		assertThat(value).isInstanceOf(List.class);
-		List<Integer> list = (List<Integer>) value;
-		assertThat(list).containsExactly(0, 1, 2, 3, 4);
 	}
 
 	@Test
 	void selectFirstItemInList() {
 		Expression expression = new SpelExpressionParser().parseRaw("integers.^[#this<5]");
 		EvaluationContext context = new StandardEvaluationContext(new ListTestBean());
-		Object value = expression.getValue(context);
+		assertThat(expression.getValue(context)).asInstanceOf(INTEGER).isZero();
-		assertThat(value).isInstanceOf(Integer.class);
-		assertThat(value).isEqualTo(0);
 	}
 
 	@Test
 	void selectLastItemInList() {
 		Expression expression = new SpelExpressionParser().parseRaw("integers.$[#this<5]");
 		EvaluationContext context = new StandardEvaluationContext(new ListTestBean());
-		Object value = expression.getValue(context);
+		assertThat(expression.getValue(context)).asInstanceOf(INTEGER).isEqualTo(4);
-		assertThat(value).isInstanceOf(Integer.class);
-		assertThat(value).isEqualTo(4);
 	}
 
 	@Test
@@ -130,28 +125,21 @@ class SelectionAndProjectionTests extends AbstractExpressionTests {
 	void selectionWithSet() {
 		Expression expression = new SpelExpressionParser().parseRaw("integers.?[#this<5]");
 		EvaluationContext context = new StandardEvaluationContext(new SetTestBean());
-		Object value = expression.getValue(context);
+		assertThat(expression.getValue(context)).asInstanceOf(LIST).containsExactly(0, 1, 2, 3, 4);
-		assertThat(value).isInstanceOf(List.class);
-		List<Integer> list = (List<Integer>) value;
-		assertThat(list).containsExactly(0, 1, 2, 3, 4);
 	}
 
 	@Test
 	void selectFirstItemInSet() {
 		Expression expression = new SpelExpressionParser().parseRaw("integers.^[#this<5]");
 		EvaluationContext context = new StandardEvaluationContext(new SetTestBean());
-		Object value = expression.getValue(context);
+		assertThat(expression.getValue(context)).asInstanceOf(INTEGER).isZero();
-		assertThat(value).isInstanceOf(Integer.class);
-		assertThat(value).isEqualTo(0);
 	}
 
 	@Test
 	void selectLastItemInSet() {
 		Expression expression = new SpelExpressionParser().parseRaw("integers.$[#this<5]");
 		EvaluationContext context = new StandardEvaluationContext(new SetTestBean());
-		Object value = expression.getValue(context);
+		assertThat(expression.getValue(context)).asInstanceOf(INTEGER).isEqualTo(4);
-		assertThat(value).isInstanceOf(Integer.class);
-		assertThat(value).isEqualTo(4);
 	}
 
 	@Test
@@ -159,10 +147,7 @@ class SelectionAndProjectionTests extends AbstractExpressionTests {
 	void selectionWithIterable() {
 		Expression expression = new SpelExpressionParser().parseRaw("integers.?[#this<5]");
 		EvaluationContext context = new StandardEvaluationContext(new IterableTestBean());
-		Object value = expression.getValue(context);
+		assertThat(expression.getValue(context)).asInstanceOf(LIST).containsExactly(0, 1, 2, 3, 4);
-		assertThat(value).isInstanceOf(List.class);
-		List<Integer> list = (List<Integer>) value;
-		assertThat(list).containsExactly(0, 1, 2, 3, 4);
 	}
 
 	@Test
@@ -173,26 +158,21 @@ class SelectionAndProjectionTests extends AbstractExpressionTests {
 		assertThat(value.getClass().isArray()).isTrue();
 		TypedValue typedValue = new TypedValue(value);
 		assertThat(typedValue.getTypeDescriptor().getElementTypeDescriptor().getType()).isEqualTo(Integer.class);
-		Integer[] array = (Integer[]) value;
+		assertThat((Integer[]) value).containsExactly(0, 1, 2, 3, 4);
-		assertThat(array).containsExactly(0, 1, 2, 3, 4);
 	}
 
 	@Test
 	void selectFirstItemInArray() {
 		Expression expression = new SpelExpressionParser().parseRaw("integers.^[#this<5]");
 		EvaluationContext context = new StandardEvaluationContext(new ArrayTestBean());
-		Object value = expression.getValue(context);
+		assertThat(expression.getValue(context)).asInstanceOf(INTEGER).isZero();
-		assertThat(value).isInstanceOf(Integer.class);
-		assertThat(value).isEqualTo(0);
 	}
 
 	@Test
 	void selectLastItemInArray() {
 		Expression expression = new SpelExpressionParser().parseRaw("integers.$[#this<5]");
 		EvaluationContext context = new StandardEvaluationContext(new ArrayTestBean());
-		Object value = expression.getValue(context);
+		assertThat(expression.getValue(context)).asInstanceOf(INTEGER).isEqualTo(4);
-		assertThat(value).isInstanceOf(Integer.class);
-		assertThat(value).isEqualTo(4);
 	}
 
 	@Test
@@ -203,26 +183,21 @@ class SelectionAndProjectionTests extends AbstractExpressionTests {
 		assertThat(value.getClass().isArray()).isTrue();
 		TypedValue typedValue = new TypedValue(value);
 		assertThat(typedValue.getTypeDescriptor().getElementTypeDescriptor().getType()).isEqualTo(Integer.class);
-		Integer[] array = (Integer[]) value;
+		assertThat((Integer[]) value).containsExactly(0, 1, 2, 3, 4);
-		assertThat(array).containsExactly(0, 1, 2, 3, 4);
 	}
 
 	@Test
 	void selectFirstItemInPrimitiveArray() {
 		Expression expression = new SpelExpressionParser().parseRaw("ints.^[#this<5]");
 		EvaluationContext context = new StandardEvaluationContext(new ArrayTestBean());
-		Object value = expression.getValue(context);
+		assertThat(expression.getValue(context)).asInstanceOf(INTEGER).isZero();
-		assertThat(value).isInstanceOf(Integer.class);
-		assertThat(value).isEqualTo(0);
 	}
 
 	@Test
 	void selectLastItemInPrimitiveArray() {
 		Expression expression = new SpelExpressionParser().parseRaw("ints.$[#this<5]");
 		EvaluationContext context = new StandardEvaluationContext(new ArrayTestBean());
-		Object value = expression.getValue(context);
+		assertThat(expression.getValue(context)).asInstanceOf(INTEGER).isEqualTo(4);
-		assertThat(value).isInstanceOf(Integer.class);
-		assertThat(value).isEqualTo(4);
 	}
 
 	@Test
@@ -269,10 +244,7 @@ class SelectionAndProjectionTests extends AbstractExpressionTests {
 		Expression expression = new SpelExpressionParser().parseRaw("#testList.![wrapper.value]");
 		EvaluationContext context = new StandardEvaluationContext();
 		context.setVariable("testList", IntegerTestBean.createList());
-		Object value = expression.getValue(context);
+		assertThat(expression.getValue(context)).asInstanceOf(LIST).containsExactly(5, 6, 7);
-		assertThat(value).isInstanceOf(List.class);
-		List<Integer> list = (List<Integer>) value;
-		assertThat(list).containsExactly(5, 6, 7);
 	}
 
 	@Test
@@ -287,10 +259,7 @@ class SelectionAndProjectionTests extends AbstractExpressionTests {
 		Expression expression = new SpelExpressionParser().parseRaw("#testList.![wrapper.value]");
 		EvaluationContext context = new StandardEvaluationContext();
 		context.setVariable("testList", IntegerTestBean.createSet());
-		Object value = expression.getValue(context);
+		assertThat(expression.getValue(context)).asInstanceOf(LIST).containsExactly(5, 6, 7);
-		assertThat(value).isInstanceOf(List.class);
-		List<Integer> list = (List<Integer>) value;
-		assertThat(list).containsExactly(5, 6, 7);
 	}
 
 	@Test
@@ -299,10 +268,7 @@ class SelectionAndProjectionTests extends AbstractExpressionTests {
 		Expression expression = new SpelExpressionParser().parseRaw("#testList.![wrapper.value]");
 		EvaluationContext context = new StandardEvaluationContext();
 		context.setVariable("testList", IntegerTestBean.createIterable());
-		Object value = expression.getValue(context);
+		assertThat(expression.getValue(context)).asInstanceOf(LIST).containsExactly(5, 6, 7);
-		assertThat(value).isInstanceOf(List.class);
-		List<Integer> list = (List<Integer>) value;
-		assertThat(list).containsExactly(5, 6, 7);
 	}
 
 	@Test
@@ -314,8 +280,7 @@ class SelectionAndProjectionTests extends AbstractExpressionTests {
 		assertThat(value.getClass().isArray()).isTrue();
 		TypedValue typedValue = new TypedValue(value);
 		assertThat(typedValue.getTypeDescriptor().getElementTypeDescriptor().getType()).isEqualTo(Number.class);
-		Number[] array = (Number[]) value;
+		assertThat((Number[]) value).containsExactly(5, 5.9f, 7);
-		assertThat(array).containsExactly(5, 5.9f, 7);
 	}