Move conformance test framework code into a subproject (#108)

Part of #107.

build.gradle

@@ -42,11 +42,10 @@ dependencies {
     testImplementation 'junit:junit:4.12'
     // The jsr305 dep lets us use its annotations in some of the sample inputs we test against.
     testImplementation 'com.google.code.findbugs:jsr305:3.0.2'
-    // The Guava dep lets us test our special handling of some Guava classes.
     testImplementation 'com.google.guava:guava:31.1-jre'
     testImplementation 'org.plumelib:plume-util:1.5.5'
     testImplementation "org.checkerframework:framework-test:${cfVersion}"
-    testImplementation "com.google.truth:truth:1.1.3"
+    testImplementation project(":conformance")
 
     errorproneJavac "com.google.errorprone:javac:9+181-r4173-1"
     errorprone "com.google.errorprone:error_prone_core:2.18.0"

conformance/build.gradle

@@ -0,0 +1,24 @@
+plugins {
+    id 'java-library'
+}
+
+group 'org.jspecify'
+version '0.1'
+
+repositories {
+    mavenCentral()
+}
+
+java {
+    sourceCompatibility = 1.9
+}
+
+dependencies {
+    api 'com.google.guava:guava:31.1-jre'
+    implementation "com.google.truth:truth:1.1.3"
+    implementation "org.jspecify:jspecify:0.0.0-SNAPSHOT"
+}
+
+test {
+    useJUnitPlatform()
+}

src/test/java/tests/conformance/ConformanceTestReport.java → conformance/src/main/java/tests/conformance/ConformanceTestReport.java

@@ -28,12 +28,11 @@
 import java.nio.file.Path;
 import java.util.Collection;
 import java.util.Formatter;
-import tests.ConformanceTest;
 import tests.conformance.AbstractConformanceTest.ExpectedFact;
 import tests.conformance.AbstractConformanceTest.Fact;
 import tests.conformance.AbstractConformanceTest.ReportedFact;
 
-/** Represents the results of running {@link ConformanceTest} on a set of files. */
+/** Represents the results of running an {@link AbstractConformanceTest} on a set of files. */
 public final class ConformanceTestReport {
   /** An empty report. */
   static final ConformanceTestReport EMPTY =

settings.gradle

@@ -1,5 +1,6 @@
 // Project name is read-only in build scripts, and defaults to directory name.
 rootProject.name = "jspecify-reference-checker"
+include 'conformance'
 
 def initializeProject() {
     exec {