ExcessiveLambdaUsageInspection: support JUnit5 assertions; regex as lambdaMethod, minor improvements (IDEA-CR-16398)

java/java-tests/testData/codeInsight/daemonCodeAnalyzer/quickFix/excessiveLambdaUsage/afterJUnit5Assert.java

@@ -0,0 +1,17 @@
+// "Use 'assertEquals' method without lambda" "true"
+package org.junit.jupiter.api;
+
+interface Supplier<T> {
+    T supply();
+}
+
+class Assertions {
+    static void assertEquals(int expected, int actual, String message) {};
+    static void assertEquals(int expected, int actual, Supplier<String> message) {};
+}
+
+class Test {
+    public void test() {
+        Assertions.assertEquals(4, 2+2, "Math works!");
+    }
+}

java/java-tests/testData/codeInsight/daemonCodeAnalyzer/quickFix/excessiveLambdaUsage/beforeJUnit5Assert.java

@@ -0,0 +1,17 @@
+// "Use 'assertEquals' method without lambda" "true"
+package org.junit.jupiter.api;
+
+interface Supplier<T> {
+    T supply();
+}
+
+class Assertions {
+    static void assertEquals(int expected, int actual, String message) {};
+    static void assertEquals(int expected, int actual, Supplier<String> message) {};
+}
+
+class Test {
+    public void test() {
+        Assertions.assertEquals(4, 2+2, () <caret>-> "Math works!");
+    }
+}