[Java]: Add precondition support for testing library asserts

java/ql/test/library-tests/guards/Preconditions.java

@@ -0,0 +1,95 @@
+import org.junit.Assert;
+import org.junit.jupiter.api.Assertions;
+
+public class Preconditions {
+    public static void guarded() {}
+
+    void test1() {
+        Assert.assertTrue(true);
+        guarded();
+    }
+
+    void test2() {
+        Assert.assertTrue(false);
+        guarded();
+    }
+
+    void test3() {
+        Assert.assertFalse(false);
+        guarded();
+    }
+
+    void test4() {
+        Assert.assertFalse(true);
+        guarded();
+    }
+
+    void test5() {
+        Assert.assertTrue("Reason", true);
+        guarded();
+    }
+
+    void test6() {
+        Assert.assertTrue("Reason", false);
+        guarded();
+    }
+
+    void test7() {
+        Assert.assertFalse("Reason", false);
+        guarded();
+    }
+
+    void test8() {
+        Assert.assertFalse("Reason", true);
+        guarded();
+    }
+
+    void test9() {
+        r(true);
+        guarded();
+    }
+
+    static void r(boolean b) {
+        Assert.assertTrue("Unified Reason", b);
+    }
+
+    void test10() {
+        Assertions.assertTrue(true);
+        guarded();
+    }
+
+    void test11() {
+        Assertions.assertTrue(false);
+        guarded();
+    }
+
+    void test12() {
+        Assertions.assertFalse(false);
+        guarded();
+    }
+
+    void test13() {
+        Assertions.assertFalse(true);
+        guarded();
+    }
+
+    void test14() {
+        Assertions.assertTrue(true, "Reason");
+        guarded();
+    }
+
+    void test15() {
+        Assertions.assertTrue(false, "Reason");
+        guarded();
+    }
+
+    void test16() {
+        Assertions.assertFalse(false, "Reason");
+        guarded();
+    }
+
+    void test17() {
+        Assertions.assertFalse(true, "Reason");
+        guarded();
+    }
+}

java/ql/test/library-tests/guards/guardspreconditions.expected

@@ -0,0 +1,13 @@
+| Preconditions.java:8:9:8:31 | assertTrue(...) | true | Preconditions.java:9:9:9:18 | <Expr>; |
+| Preconditions.java:13:9:13:32 | assertTrue(...) | true | Preconditions.java:14:9:14:18 | <Expr>; |
+| Preconditions.java:18:9:18:33 | assertFalse(...) | false | Preconditions.java:19:9:19:18 | <Expr>; |
+| Preconditions.java:23:9:23:32 | assertFalse(...) | false | Preconditions.java:24:9:24:18 | <Expr>; |
+| Preconditions.java:48:9:48:15 | r(...) | true | Preconditions.java:49:9:49:18 | <Expr>; |
+| Preconditions.java:57:9:57:35 | assertTrue(...) | true | Preconditions.java:58:9:58:18 | <Expr>; |
+| Preconditions.java:62:9:62:36 | assertTrue(...) | true | Preconditions.java:63:9:63:18 | <Expr>; |
+| Preconditions.java:67:9:67:37 | assertFalse(...) | false | Preconditions.java:68:9:68:18 | <Expr>; |
+| Preconditions.java:72:9:72:36 | assertFalse(...) | false | Preconditions.java:73:9:73:18 | <Expr>; |
+| Preconditions.java:77:9:77:45 | assertTrue(...) | true | Preconditions.java:78:9:78:18 | <Expr>; |
+| Preconditions.java:82:9:82:46 | assertTrue(...) | true | Preconditions.java:83:9:83:18 | <Expr>; |
+| Preconditions.java:87:9:87:47 | assertFalse(...) | false | Preconditions.java:88:9:88:18 | <Expr>; |
+| Preconditions.java:92:9:92:46 | assertFalse(...) | false | Preconditions.java:93:9:93:18 | <Expr>; |

java/ql/test/library-tests/guards/guardspreconditions.ql

@@ -0,0 +1,8 @@
+import java
+import semmle.code.java.controlflow.Guards
+
+from Guard g, BasicBlock bb, boolean branch
+where
+  g.controls(bb, branch) and
+  g.getEnclosingCallable().getDeclaringType().hasName("Preconditions")
+select g, branch, bb

java/ql/test/library-tests/guards/options

@@ -0,0 +1 @@
+//semmle-extractor-options: --javac-args -cp ${testdir}/../../stubs/junit-4.11/:${testdir}/../../stubs/junit-jupiter-api-5.2.0/

java/ql/test/stubs/junit-jupiter-api-5.2.0/org/junit/jupiter/api/Assertions.java

@@ -0,0 +1,28 @@
+/*
+ * Copyright 2015-2022 the original author or authors.
+ *
+ * All rights reserved. This program and the accompanying materials are
+ * made available under the terms of the Eclipse Public License v2.0 which
+ * accompanies this distribution and is available at
+ *
+ * https://www.eclipse.org/legal/epl-v20.html
+ */
+
+package org.junit.jupiter.api;
+
+public class Assertions {
+    public static void assertTrue(boolean condition) {
+    }
+
+    public static void assertTrue(boolean condition, String message) {
+
+    }
+
+    public static void assertFalse(boolean condition) {
+    
+    }
+
+    public static void assertFalse(boolean condition, String message) {
+    
+    }
+}