Add unit tests for org.antlr.v4.misc.Utils

These tests were written using Diffblue Cover.

tool-testsuite/test/org/antlr/v4/misc/UtilsTest.java

@@ -0,0 +1,129 @@
+package org.antlr.v4.misc;
+
+import org.antlr.runtime.Token;
+import org.antlr.v4.tool.ast.GrammarAST;
+import org.junit.Assert;
+import org.junit.Test;
+
+import java.util.ArrayList;
+
+public class UtilsTest {
+
+	@Test
+	public void testStripFileExtension() {
+		Assert.assertNull(Utils.stripFileExtension(null));
+		Assert.assertEquals("foo", Utils.stripFileExtension("foo"));
+		Assert.assertEquals("foo", Utils.stripFileExtension("foo.txt"));
+	}
+
+	@Test
+	public void testJoin() {
+		Assert.assertEquals("foobbar",
+			Utils.join(new String[]{"foo", "bar"}, "b"));
+		Assert.assertEquals("foo,bar",
+			Utils.join(new String[]{"foo", "bar"}, ","));
+	}
+
+	@Test
+	public void testSortLinesInString() {
+		Assert.assertEquals("bar\nbaz\nfoo\n",
+			Utils.sortLinesInString("foo\nbar\nbaz"));
+	}
+
+	@Test
+	public void testNodesToStrings() {
+		ArrayList<GrammarAST> values = new ArrayList<>();
+		values.add(new GrammarAST(Token.EOR_TOKEN_TYPE));
+		values.add(new GrammarAST(Token.DOWN));
+		values.add(new GrammarAST(Token.UP));
+
+		Assert.assertNull(Utils.nodesToStrings(null));
+		Assert.assertNotNull(Utils.nodesToStrings(values));
+	}
+
+	@Test
+	public void testCapitalize() {
+		Assert.assertEquals("Foo", Utils.capitalize("foo"));
+	}
+
+	@Test
+	public void testDecapitalize() {
+		Assert.assertEquals("fOO", Utils.decapitalize("FOO"));
+	}
+
+	@Test
+	public void testSelect() {
+		ArrayList<String> strings = new ArrayList<>();
+		strings.add("foo");
+		strings.add("bar");
+
+		Utils.Func1<String, String> func1 = new Utils.Func1() {
+			@Override
+			public Object exec(Object arg1) {
+				return "baz";
+			}
+		};
+
+		ArrayList<String> retval = new ArrayList<>();
+		retval.add("baz");
+		retval.add("baz");
+
+		Assert.assertEquals(retval, Utils.select(strings, func1));
+		Assert.assertNull(Utils.select(null, null));
+	}
+
+	@Test
+	public void testFind() {
+		ArrayList<String> strings = new ArrayList<>();
+		strings.add("foo");
+		strings.add("bar");
+		Assert.assertEquals("foo", Utils.find(strings, String.class));
+
+		Assert.assertNull(Utils.find(new ArrayList<>(), String.class));
+	}
+
+	@Test
+	public void testIndexOf() {
+		ArrayList<String> strings = new ArrayList<>();
+		strings.add("foo");
+		strings.add("bar");
+		Utils.Filter filter = new Utils.Filter() {
+			@Override
+			public boolean select(Object o) {
+				return true;
+			}
+		};
+		Assert.assertEquals(0, Utils.indexOf(strings, filter));
+		Assert.assertEquals(-1, Utils.indexOf(new ArrayList<>(), null));
+	}
+
+	@Test
+	public void testLastIndexOf() {
+		ArrayList<String> strings = new ArrayList<>();
+		strings.add("foo");
+		strings.add("bar");
+		Utils.Filter filter = new Utils.Filter() {
+			@Override
+			public boolean select(Object o) {
+				return true;
+			}
+		};
+		Assert.assertEquals(1, Utils.lastIndexOf(strings, filter));
+		Assert.assertEquals(-1, Utils.lastIndexOf(new ArrayList<>(), null));
+	}
+
+	@Test
+	public void testSetSize() {
+		ArrayList<String> strings = new ArrayList<>();
+		strings.add("foo");
+		strings.add("bar");
+		strings.add("baz");
+		Assert.assertEquals(3, strings.size());
+
+		Utils.setSize(strings, 2);
+		Assert.assertEquals(2, strings.size());
+
+		Utils.setSize(strings, 4);
+		Assert.assertEquals(4, strings.size());
+	}
+}