diff --git a/src/test/java/kevin/parser/FileParserTest.java b/src/test/java/kevin/parser/FileParserTest.java
new file mode 100644
index 0000000000..cea56e562a
--- /dev/null
+++ b/src/test/java/kevin/parser/FileParserTest.java
@@ -0,0 +1,52 @@
+package kevin.parser;
+
+import kevin.exception.KevinException;
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+public class FileParserTest {
+    @Test
+    public void parseLine_invalidCommand_exceptionThrown() {
+        String input = "invalidCommand";
+        try {
+            FileParser fileParser = new FileParser();
+            fileParser.parseLine(input);
+        } catch (Exception ex) {
+            assertTrue(ex instanceof KevinException);
+        }
+    }
+
+    @Test
+    public void parseLine_invalidToDoInput_exceptionThrown() {
+        String input = "Todo - ";
+        try {
+            FileParser fileParser = new FileParser();
+            fileParser.parseLine(input);
+        } catch (Exception ex) {
+            assertTrue(ex instanceof KevinException);
+        }
+    }
+
+    @Test
+    public void parseLine_invalidDeadlineInput_exceptionThrown() {
+        String input = "Deadline - cs2103 - today";
+        try {
+            FileParser fileParser = new FileParser();
+            fileParser.parseLine(input);
+        } catch (Exception ex) {
+            assertTrue(ex instanceof KevinException);
+        }
+    }
+
+    @Test
+    public void parseLine_invalidEventInput_exceptionThrown() {
+        String input = "Event - lecture - 2pm";
+        try {
+            FileParser fileParser = new FileParser();
+            fileParser.parseLine(input);
+        } catch (Exception ex) {
+            assertTrue(ex instanceof KevinException);
+        }
+    }
+}
diff --git a/src/test/java/kevin/parser/ParserTest.java b/src/test/java/kevin/parser/ParserTest.java
new file mode 100644
index 0000000000..4775f04ed4
--- /dev/null
+++ b/src/test/java/kevin/parser/ParserTest.java
@@ -0,0 +1,52 @@
+package kevin.parser;
+
+import kevin.exception.KevinException;
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+public class ParserTest {
+    @Test
+    public void prepareArguments_invalidCommand_exceptionThrown() {
+        String input = "invalidCommand";
+        try {
+            Parser parser = new Parser();
+            parser.prepareArguments(input);
+        } catch (Exception ex) {
+            assertTrue(ex instanceof KevinException);
+        }
+    }
+
+    @Test
+    public void prepareArguments_invalidToDoInput_exceptionThrown() {
+        String input = "todo ";
+        try {
+            Parser parser = new Parser();
+            parser.prepareArguments(input);
+        } catch (Exception ex) {
+            assertTrue(ex instanceof KevinException);
+        }
+    }
+
+    @Test
+    public void prepareArguments_invalidDeadlineInput_exceptionThrown() {
+        String input = "deadline cs2103 by today";
+        try {
+            Parser parser = new Parser();
+            parser.prepareArguments(input);
+        } catch (Exception ex) {
+            assertTrue(ex instanceof KevinException);
+        }
+    }
+
+    @Test
+    public void prepareArguments_invalidEventInput_exceptionThrown() {
+        String input = "event lecture /from 2pm";
+        try {
+            Parser parser = new Parser();
+            parser.prepareArguments(input);
+        } catch (Exception ex) {
+            assertTrue(ex instanceof KevinException);
+        }
+    }
+}