Updated dependencies, attempt to fix NPE, workaround for scheduled removal of a static field in PsiParserFacade.

Added PluginVerifier to build.gradle.

src/main/java/de/platon42/intellij/plugins/cajon/Extensions.kt

@@ -115,8 +115,7 @@ fun PsiMethodCallExpression.getExpectedNullNonNullResult(): Boolean? {
 }
 
 fun PsiMethodCallExpression.calculateConstantParameterValue(argIndex: Int): Any? {
-    if (argIndex >= argumentList.expressions.size) return null
-    return getArg(argIndex).calculateConstantValue()
+    return getArgOrNull(argIndex)?.calculateConstantValue()
 }
 
 fun PsiExpression.calculateConstantValue(): Any? {

src/main/java/de/platon42/intellij/plugins/cajon/quickfixes/JoinStatementsQuickFix.kt

@@ -56,9 +56,14 @@ class JoinStatementsQuickFix(private val separateLineLimit: Int) : AbstractCommo
     }
 
     private fun addLineBreak(project: Project, lastElementBeforeConcat: PsiElement) {
-        val newLineNode =
+        val newLineNode = try {
+            PsiParserFacade.getInstance(project).createWhiteSpaceFromText("\n\t")
+        } catch (ex: NoSuchMethodError) {
+            // scheduled for removal, but alternate version not even available in 2020.3.
+            // So keep it here until we run into a problem.
+            // Changing the min version from 2017.3 to 2021.x is a major thing.
             PsiParserFacade.SERVICE.getInstance(project).createWhiteSpaceFromText("\n\t")
-
+        }
         lastElementBeforeConcat.addAfter(newLineNode, lastElementBeforeConcat.firstChild)
     }
 

src/test/java/de/platon42/intellij/plugins/cajon/AbstractCajonTest.kt

@@ -8,6 +8,7 @@ import de.platon42.intellij.jupiter.LightCodeInsightExtension
 import de.platon42.intellij.jupiter.TestDataPath
 import de.platon42.intellij.jupiter.TestJdk
 import org.assertj.core.api.Assertions.assertThat
+import org.assertj.core.api.Condition
 import org.junit.jupiter.api.DisplayNameGeneration
 import org.junit.jupiter.api.DisplayNameGenerator
 import org.junit.jupiter.api.extension.ExtendWith
@@ -39,11 +40,8 @@ abstract class AbstractCajonTest {
     }
 
     protected fun assertHighlightings(myFixture: JavaCodeInsightTestFixture, count: Int, snippet: String) {
-        val highlights = myFixture.doHighlighting()
-            .asSequence()
-            .filter { it.description?.contains(snippet) ?: false }
-            .toList()
-        assertThat(highlights).hasSize(count)
+        assertThat(myFixture.doHighlighting())
+            .areExactly(count, Condition({ it.description?.contains(snippet) ?: false }, "containing"))
     }
 
     class CutOffFixtureDisplayNameGenerator : DisplayNameGenerator.ReplaceUnderscores() {