Add swaproom command parser tests

src/test/java/seedu/room/logic/parser/SwaproomCommandParserTest.java

@@ -0,0 +1,39 @@
+package seedu.room.logic.parser;
+
+import static seedu.room.commons.core.Messages.MESSAGE_INVALID_COMMAND_FORMAT;
+import static seedu.room.logic.parser.CommandParserTestUtil.assertParseFailure;
+import static seedu.room.logic.parser.CommandParserTestUtil.assertParseSuccess;
+import static seedu.room.testutil.TypicalIndexes.INDEX_FIRST_PERSON;
+import static seedu.room.testutil.TypicalIndexes.INDEX_SECOND_PERSON;
+
+import org.junit.Test;
+
+import seedu.room.logic.commands.SwaproomCommand;
+
+/**
+ * As we are only doing white-box testing, our test cases do not cover path variations
+ * outside of the DeleteCommand code. For example, inputs "1" and "1 abc" take the
+ * same path through the DeleteCommand, and therefore we test only one of them.
+ * The path variation for those two cases occur inside the ParserUtil, and
+ * therefore should be covered by the ParserUtilTest.
+ */
+public class SwaproomCommandParserTest {
+
+    private SwaproomCommandParser parser = new SwaproomCommandParser();
+
+    @Test
+    public void parse_validArgs_returnsSwapCommand() {
+        assertParseSuccess(parser, " 1 2", new SwaproomCommand(INDEX_FIRST_PERSON, INDEX_SECOND_PERSON));
+    }
+
+    @Test
+    public void parse_invalidArgs_throwsParseException() {
+        assertParseFailure(parser, " a", String.format(MESSAGE_INVALID_COMMAND_FORMAT, SwaproomCommand.MESSAGE_USAGE));
+    }
+
+    @Test
+    public void parse_invalidNumArgs_throwsParseException() {
+        assertParseFailure(parser, " 1 3 4", String.format(MESSAGE_INVALID_COMMAND_FORMAT,
+                SwaproomCommand.MESSAGE_USAGE));
+    }
+}