Trim expressions supplied to @DisabledIf

Prior to this commit, the DisabledIfCondition did not trim whitespace
from expressions configured via @DisabledIf. Consequently, results such
as "  true  " would evaluate to "false".

This commit fixes this problem by trimming all expressions configured
via @DisabledIf.

Issue: SPR-14614

spring-test/src/test/java/org/springframework/test/context/junit/jupiter/DisabledIfTestCase.java

@@ -50,6 +50,12 @@ class DisabledIfTestCase {
 			fail("This test must be disabled");
 		}
 
+		@Test
+		@DisabledIf("   true   ")
+		void disabledByStringTrueWithSurroundingWhitespace() {
+			fail("This test must be disabled");
+		}
+
 		@Test
 		@DisabledIf("TrUe")
 		void disabledByStringTrueIgnoreCase() {
@@ -62,12 +68,24 @@ class DisabledIfTestCase {
 			fail("This test must be disabled");
 		}
 
+		@Test
+		@DisabledIf("\t${foo}   ")
+		void disabledByPropertyPlaceholderWithSurroundingWhitespace() {
+			fail("This test must be disabled");
+		}
+
 		@Test
 		@DisabledIf("#{T(java.lang.Boolean).TRUE}")
 		void disabledBySpelBoolean() {
 			fail("This test must be disabled");
 		}
 
+		@Test
+		@DisabledIf("   #{T(java.lang.Boolean).TRUE}   ")
+		void disabledBySpelBooleanWithSurroundingWhitespace() {
+			fail("This test must be disabled");
+		}
+
 		@Test
 		@DisabledIf("#{'tr' + 'ue'}")
 		void disabledBySpelStringConcatenation() {