Refactor: Replace deprecated org.junit.Assert.assertThat (#322)

I replaced all usages of `org.junit.Assert.assertThat` with the
recommended `org.hamcrest.MatcherAssert.assertThat`.

This change updates the import statements in the affected test files.

Co-authored-by: google-labs-jules[bot] <161369871+google-labs-jules[bot]@users.noreply.github.com>

Author: georgewfraser

src/test/java/org/javacs/ArtifactTest.java

@@ -1,7 +1,7 @@
 package org.javacs;
 
 import static org.hamcrest.Matchers.*;
-import static org.junit.Assert.*;
+import static org.hamcrest.MatcherAssert.assertThat;
 
 import org.junit.Test;
 

src/test/java/org/javacs/ClassesTest.java

@@ -1,7 +1,8 @@
 package org.javacs;
 
 import static org.hamcrest.Matchers.*;
-import static org.junit.Assert.*;
+import static org.hamcrest.MatcherAssert.assertThat;
+import static org.junit.Assert.assertTrue;
 
 import java.net.URI;
 import java.nio.file.FileSystems;

src/test/java/org/javacs/CodeActionTest.java

@@ -1,7 +1,7 @@
 package org.javacs;
 
 import static org.hamcrest.Matchers.*;
-import static org.junit.Assert.*;
+import static org.hamcrest.MatcherAssert.assertThat;
 
 import java.util.ArrayList;
 import java.util.List;

src/test/java/org/javacs/CodeLensTest.java

@@ -1,7 +1,7 @@
 package org.javacs;
 
 import static org.hamcrest.Matchers.*;
-import static org.junit.Assert.*;
+import static org.hamcrest.MatcherAssert.assertThat;
 
 import java.util.ArrayList;
 import java.util.List;

src/test/java/org/javacs/CompletionsScopesTest.java

@@ -2,7 +2,7 @@
 
 import static org.hamcrest.Matchers.hasItems;
 import static org.hamcrest.Matchers.not;
-import static org.junit.Assert.assertThat;
+import static org.hamcrest.MatcherAssert.assertThat;
 
 import org.junit.Test;
 

src/test/java/org/javacs/CompletionsTest.java

@@ -1,7 +1,8 @@
 package org.javacs;
 
 import static org.hamcrest.Matchers.*;
-import static org.junit.Assert.*;
+import static org.hamcrest.MatcherAssert.assertThat;
+import static org.junit.Assert.fail;
 
 import java.io.IOException;
 import java.nio.file.Files;

src/test/java/org/javacs/FileEncodingTest.java

@@ -1,36 +1,36 @@
-package org.javacs;
-
-import static org.hamcrest.Matchers.equalTo;
-import static org.junit.Assert.assertThat;
-
-import java.nio.file.Paths;
-import java.util.Set;
-import org.junit.Test;
-import org.junit.Before;
-
-/**
- * These tests are isolated because bugs caused by encoding issues could cause
- * phantom failures in other tests.
- */
-public class FileEncodingTest {
-
-    @Before
-    public void resetSourcesBefore() {
-        FileStore.reset();
-    }
-
-    @Test
-    public void packageNameForNonUnicodeSource() {
-        var encodingTestRoot = Paths.get("src/test/examples/encoding").normalize();
-
-        // If an exception is thrown due to an unknown encoding it would
-        // be here.
-        FileStore.setWorkspaceRoots(Set.of(encodingTestRoot));
-
-        var file = FindResource.path("/org/javacs/example/EncodingWindows1252.java");
-
-        // Currently, non-unicode files are ignored. This test will change if
-        // support is added in the future.
-        assertThat(FileStore.suggestedPackageName(file), equalTo(""));
-    }
-}
+package org.javacs;
+
+import static org.hamcrest.Matchers.equalTo;
+import static org.hamcrest.MatcherAssert.assertThat;
+
+import java.nio.file.Paths;
+import java.util.Set;
+import org.junit.Test;
+import org.junit.Before;
+
+/**
+ * These tests are isolated because bugs caused by encoding issues could cause
+ * phantom failures in other tests.
+ */
+public class FileEncodingTest {
+
+    @Before
+    public void resetSourcesBefore() {
+        FileStore.reset();
+    }
+
+    @Test
+    public void packageNameForNonUnicodeSource() {
+        var encodingTestRoot = Paths.get("src/test/examples/encoding").normalize();
+
+        // If an exception is thrown due to an unknown encoding it would
+        // be here.
+        FileStore.setWorkspaceRoots(Set.of(encodingTestRoot));
+
+        var file = FindResource.path("/org/javacs/example/EncodingWindows1252.java");
+
+        // Currently, non-unicode files are ignored. This test will change if
+        // support is added in the future.
+        assertThat(FileStore.suggestedPackageName(file), equalTo(""));
+    }
+}

src/test/java/org/javacs/FileStoreTest.java

@@ -1,7 +1,7 @@
 package org.javacs;
 
 import static org.hamcrest.Matchers.*;
-import static org.junit.Assert.assertThat;
+import static org.hamcrest.MatcherAssert.assertThat;
 
 import java.util.Set;
 import org.junit.Before;

src/test/java/org/javacs/FindReferencesTest.java

@@ -1,7 +1,7 @@
 package org.javacs;
 
 import static org.hamcrest.Matchers.*;
-import static org.junit.Assert.*;
+import static org.hamcrest.MatcherAssert.assertThat;
 
 import java.util.ArrayList;
 import java.util.List;

src/test/java/org/javacs/FindSrcZipTest.java

@@ -1,7 +1,8 @@
 package org.javacs;
 
 import static org.hamcrest.Matchers.*;
-import static org.junit.Assert.*;
+import static org.hamcrest.MatcherAssert.assertThat;
+import static org.junit.Assert.assertTrue;
 
 import java.nio.file.Files;
 import java.nio.file.Path;