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

1 files changed, 115 insertions, 0 deletions

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
+
+}