[+] Added JUnit tests (only testign valid expressions as of now)

3 files changed, 129 insertions, 2 deletions

diff --git a/calculator-java/pom.xml b/calculator-java/pom.xml
index 1edc3ba..d181b7d 100644
--- a/calculator-java/pom.xml
+++ b/calculator-java/pom.xml
@@ -7,6 +7,20 @@
     <groupId>ch.bfh</groupId>
     <artifactId>calculator-java</artifactId>
     <version>1.0-SNAPSHOT</version>
+    <dependencies>
+        <dependency>
+            <groupId>junit</groupId>
+            <artifactId>junit</artifactId>
+            <version>4.13.1</version>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>org.junit.jupiter</groupId>
+            <artifactId>junit-jupiter-api</artifactId>
+            <version>5.7.0</version>
+            <scope>test</scope>
+        </dependency>
+    </dependencies>
 
     <properties>
         <maven.compiler.source>11</maven.compiler.source>
diff --git a/calculator-java/src/main/java/ch/bfh/Main.java b/calculator-java/src/main/java/ch/bfh/Main.java
index 302f5ed..e57fc8a 100644
--- a/calculator-java/src/main/java/ch/bfh/Main.java
+++ b/calculator-java/src/main/java/ch/bfh/Main.java
@@ -1,8 +1,6 @@
 package ch.bfh;
 
 import ch.bfh.parser.ExpressionParser;
-
-import java.util.Arrays;
 import java.util.Scanner;
 
 public class Main {
diff --git a/calculator-java/src/test/java/ExpressionParserTest.java b/calculator-java/src/test/java/ExpressionParserTest.java
new file mode 100644
index 0000000..8a9814c
--- /dev/null
+++ b/calculator-java/src/test/java/ExpressionParserTest.java
@@ -0,0 +1,115 @@
+import ch.bfh.CalculatorLexer;
+import ch.bfh.parser.ExpressionParser;
+import org.junit.Test;
+import static org.junit.Assert.assertEquals;
+
+public class ExpressionParserTest {
+
+    // Only testing correct expressions first
+    @Test
+    public void emptyExpression() {
+        CalculatorLexer cl = new CalculatorLexer();
+        cl.initLexer("");
+        ExpressionParser ep = new ExpressionParser(cl);
+        assertEquals(0.0, ep.getValue(), 0.0);
+    }
+
+    @Test
+    public void oneFactor() {
+        CalculatorLexer cl = new CalculatorLexer();
+        cl.initLexer("10");
+        ExpressionParser ep = new ExpressionParser(cl);
+        assertEquals(10.0, ep.getValue(), 0.0);
+    }
+
+    @Test
+    public void oneParenthesisedFactor() {
+        CalculatorLexer cl = new CalculatorLexer();
+        cl.initLexer("(10)");
+        ExpressionParser ep = new ExpressionParser(cl);
+        assertEquals(10.0, ep.getValue(), 0.0);
+    }
+
+    @Test
+    public void oneNegativeFactor() {
+        CalculatorLexer cl = new CalculatorLexer();
+        cl.initLexer("-10");
+        ExpressionParser ep = new ExpressionParser(cl);
+        assertEquals(-10.0, ep.getValue(), 0.0);
+    }
+
+    @Test
+    public void oneNegativeParenthesisedFactor() {
+        CalculatorLexer cl = new CalculatorLexer();
+        cl.initLexer("-(10)");
+        ExpressionParser ep = new ExpressionParser(cl);
+        assertEquals(-10.0, ep.getValue(), 0.0);
+    }
+
+    @Test
+    public void oneNegativeParenthesisedNegativeFactor() {
+        CalculatorLexer cl = new CalculatorLexer();
+        cl.initLexer("-(-10)");
+        ExpressionParser ep = new ExpressionParser(cl);
+        assertEquals(10.0, ep.getValue(), 0.0);
+    }
+
+    @Test
+    public void twoFactorSum() {
+        CalculatorLexer cl = new CalculatorLexer();
+        cl.initLexer("2+3");
+        ExpressionParser ep = new ExpressionParser(cl);
+        assertEquals(5.0, ep.getValue(), 0.0);
+    }
+
+    @Test
+    public void twoFactorSub() {
+        CalculatorLexer cl = new CalculatorLexer();
+        cl.initLexer("2-3");
+        ExpressionParser ep = new ExpressionParser(cl);
+        assertEquals(-1.0, ep.getValue(), 0.0);
+    }
+
+    @Test
+    public void twoFactorSumWithSub() {
+        CalculatorLexer cl = new CalculatorLexer();
+        cl.initLexer("2--3");
+        ExpressionParser ep = new ExpressionParser(cl);
+        assertEquals(5.0, ep.getValue(), 0.0);
+    }
+
+    @Test
+    public void twoFactorSumWithSubParenthesised() {
+        CalculatorLexer cl = new CalculatorLexer();
+        cl.initLexer("2-(-3)");
+        ExpressionParser ep = new ExpressionParser(cl);
+        assertEquals(5.0, ep.getValue(), 0.0);
+    }
+
+    @Test
+    public void twoFactorMul() {
+        CalculatorLexer cl = new CalculatorLexer();
+        cl.initLexer("2*3");
+        ExpressionParser ep = new ExpressionParser(cl);
+        assertEquals(6.0, ep.getValue(), 0.0);
+    }
+
+    @Test
+    public void twoFactorDiv() {
+        CalculatorLexer cl = new CalculatorLexer();
+        cl.initLexer("11/4");
+        ExpressionParser ep = new ExpressionParser(cl);
+        assertEquals(2.75, ep.getValue(), 0.0);
+    }
+
+    @Test
+    public void completeArithmeticOperationWithPriorities() {
+        CalculatorLexer cl = new CalculatorLexer();
+        cl.initLexer("(4+5)*3/4");
+        ExpressionParser ep = new ExpressionParser(cl);
+        assertEquals(6.75, ep.getValue(), 0.0);
+    }
+
+    //TODO - test error messages
+
+}