tests: add test to check determinism of runtime-index (#160)

classfile-fingerprint/src/test/java/io/github/algomaster99/terminator/index/RuntimeIndexerTest.java

@@ -0,0 +1,39 @@
+package io.github.algomaster99.terminator.index;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+import java.io.IOException;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.io.TempDir;
+
+public class RuntimeIndexerTest {
+
+    @Test
+    void runtimeIndexShouldBeDeterministic(@TempDir Path tempDir) throws IOException {
+        // arrange
+        Path indexFile = tempDir.resolve("r.json");
+        Path project = Path.of("src", "test", "resources", "runtime-index", "basic-math");
+
+        // act
+        String[] jdk_argsFirst = {"jdk", "-o", indexFile.toString()};
+        Index.main(jdk_argsFirst);
+        String[] runtime_argsFirst = {
+            "runtime", "-p", project.toString(), "-i", indexFile.toString(), "-mj", "basic-math", "--cleanup"
+        };
+        Index.main(runtime_argsFirst);
+        String contentFirst = Files.readString(indexFile);
+
+        String[] jdk_argsSecond = {"jdk", "-o", indexFile.toString()};
+        Index.main(jdk_argsSecond);
+        String[] runtime_argsSecond = {
+            "runtime", "-p", project.toString(), "-i", indexFile.toString(), "-mj", "basic-math", "--cleanup"
+        };
+        Index.main(runtime_argsSecond);
+        String contentSecond = Files.readString(indexFile);
+
+        // assert
+        assertThat(contentFirst).isEqualTo(contentSecond);
+    }
+}

classfile-fingerprint/src/test/resources/runtime-index/basic-math/pom.xml

@@ -0,0 +1,29 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+
+    <groupId>org.example</groupId>
+    <artifactId>basic-math</artifactId>
+    <version>1.0-SNAPSHOT</version>
+
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-surefire-plugin</artifactId>
+                <version>3.0.0</version>
+            </plugin>
+        </plugins>
+    </build>
+
+    <dependencies>
+        <dependency>
+            <groupId>org.junit.jupiter</groupId>
+            <artifactId>junit-jupiter</artifactId>
+            <version>5.8.2</version>
+            <scope>test</scope>
+        </dependency>
+    </dependencies>
+</project>

classfile-fingerprint/src/test/resources/runtime-index/basic-math/src/main/java/foo/BasicMath.java

@@ -0,0 +1,7 @@
+package foo;
+
+public class BasicMath {
+    public static int add(int x, int y) {
+        return x + y;
+    }
+}

classfile-fingerprint/src/test/resources/runtime-index/basic-math/src/test/java/foo/BasicMathTest.java

@@ -0,0 +1,12 @@
+package foo;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+import org.junit.jupiter.api.Test;
+
+public class BasicMathTest {
+    @Test
+    void test_add() {
+        assertEquals(4, BasicMath.add(23,2));
+    }
+}