From 97c870da28ecc2a25908e2545b33a6d98adc8ab2 Mon Sep 17 00:00:00 2001
From: Ashley Scopes <73482956+ascopes@users.noreply.github.com>
Date: Sat, 28 Jan 2023 17:43:22 +0000
Subject: [PATCH] Closes #293 - Add module discoverer tests

---
 .../unit/utils/ModuleDiscovererTest.java      | 116 ++++++++++++++++++
 1 file changed, 116 insertions(+)
 create mode 100644 java-compiler-testing/src/test/java/io/github/ascopes/jct/tests/unit/utils/ModuleDiscovererTest.java

diff --git a/java-compiler-testing/src/test/java/io/github/ascopes/jct/tests/unit/utils/ModuleDiscovererTest.java b/java-compiler-testing/src/test/java/io/github/ascopes/jct/tests/unit/utils/ModuleDiscovererTest.java
new file mode 100644
index 000000000..2c4d6d6ac
--- /dev/null
+++ b/java-compiler-testing/src/test/java/io/github/ascopes/jct/tests/unit/utils/ModuleDiscovererTest.java
@@ -0,0 +1,116 @@
+/*
+ * Copyright (C) 2022 - 2023, the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package io.github.ascopes.jct.tests.unit.utils;
+
+import static org.assertj.core.api.Assertions.assertThat;
+import static io.github.ascopes.jct.tests.helpers.Fixtures.somePath;
+import static org.mockito.ArgumentMatchers.any;
+import static org.mockito.Mockito.RETURNS_DEEP_STUBS;
+import static org.mockito.Mockito.mock;
+import static org.mockito.Mockito.when;
+import static org.mockito.Mockito.withSettings;
+
+import io.github.ascopes.jct.utils.ModuleDiscoverer;
+import java.lang.module.FindException;
+import java.lang.module.ModuleDescriptor;
+import java.lang.module.ModuleFinder;
+import java.lang.module.ModuleReference;
+import java.nio.file.Path;
+import java.util.Optional;
+import java.util.Set;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.DisplayName;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.extension.ExtendWith;
+import org.mockito.Mock;
+import org.mockito.MockedStatic;
+import org.mockito.junit.jupiter.MockitoExtension;
+import org.mockito.junit.jupiter.MockitoSettings;
+import org.mockito.quality.Strictness;
+
+/**
+ * {@link ModuleDiscoverer} tests.
+ *
+ * @author Ashley Scopes
+ */
+@DisplayName("ModuleDiscoverer tests")
+@ExtendWith(MockitoExtension.class)
+@MockitoSettings(strictness = Strictness.LENIENT)
+class ModuleDiscovererTest {
+
+  @Mock
+  MockedStatic<ModuleFinder> moduleFinderStatic;
+
+  @Mock
+  ModuleFinder moduleFinder;
+
+  @BeforeEach
+  void setUp() {
+    moduleFinderStatic.when(() -> ModuleFinder.of(any()))
+        .thenReturn(moduleFinder);
+  }
+
+  @DisplayName("Modules are discovered")
+  @Test
+  void modulesAreDiscovered() {
+    // Given
+    var path1 = somePath();
+    var module1 = someModuleRef("foo.bar", path1);
+    var path2 = somePath();
+    var module2 = someModuleRef("baz.bork", path2);
+    var path3 = somePath();
+    var module3 = someModuleRef("qux.quxx", path3);
+    when(moduleFinder.findAll()).thenReturn(Set.of(module1, module2, module3));
+
+    var path = somePath();
+
+    // When
+    var results = ModuleDiscoverer.findModulesIn(path);
+
+    // Then
+    moduleFinderStatic.verify(() -> ModuleFinder.of(path));
+    assertThat(results)
+        .containsEntry("foo.bar", path1)
+        .containsEntry("baz.bork", path2)
+        .containsEntry("qux.quxx", path3)
+        .hasSize(3);
+  }
+
+  @DisplayName("Module discovery errors fail silently")
+  @Test
+  void moduleDiscoveryErrorsFailSilently() {
+    // Given
+    when(moduleFinder.findAll()).thenThrow(FindException.class);
+
+    // When
+    var results = ModuleDiscoverer.findModulesIn(somePath());
+
+    // Then
+    assertThat(results).isEmpty();
+  }
+
+  static ModuleReference someModuleRef(String name, Path path) {
+    var descriptor = mock(ModuleDescriptor.class, withSettings().defaultAnswer(RETURNS_DEEP_STUBS));
+    when(descriptor.name()).thenReturn(name);
+
+    var ref = mock(ModuleReference.class, withSettings().defaultAnswer(RETURNS_DEEP_STUBS));
+    when(ref.location()).thenReturn(Optional.of(path.toUri()));
+
+    when(ref.descriptor()).thenReturn(descriptor);
+
+    return ref;
+  }
+}