Added unit tests for the RuntimeEnvironment

test/environment/RuntimeEnvironmentTester.java

@@ -0,0 +1,64 @@
+package environment;
+
+import static org.junit.Assert.*;
+
+import java.util.*;
+
+import org.junit.*;
+
+public class RuntimeEnvironmentTester {
+    
+    private static final String TERMINATED_SUCCESSFULLY = "TERMINATED_SUCCESSFULLY";
+    private static final String TERMINATED_EXCEPTIONALLY = "TERMINATED_EXCEPTIONALLY";
+
+    private RuntimeEnvironment environment;
+    private Set<String> indicatorSet;
+
+    public RuntimeEnvironmentTester() {
+        this.environment = RuntimeEnvironment.getInstance();
+    }
+
+    @Before
+    public void setUp() {
+        this.indicatorSet = new HashSet<>();
+    }
+
+    @Test
+    public void assignInput() {
+        this.environment.setInput(System.in);
+
+        assertEquals(System.in, this.environment.getInput());
+        assertEquals(System.in.toString(), this.environment.getInputName());
+    }
+
+    @Test
+    public void assignOutput() {
+        this.environment.setOutput(System.out);
+
+        assertEquals(System.out, this.environment.getOutput());
+    }
+
+    @Test
+    public void assignErrorOutput() {
+        this.environment.setErrorOutput(System.err);
+
+        assertEquals(System.err, this.environment.getErrorOutput());
+    }
+
+    @Test
+    public void assignTerminationFunction() {
+        environment.setTerminationFunction(() -> indicatorSet.add(TERMINATED_SUCCESSFULLY));
+        environment.terminateSuccessfully();
+
+        assertTrue(indicatorSet.contains(TERMINATED_SUCCESSFULLY));
+    }
+
+    @Test
+    public void assignErrorTerminationFunction() {
+        environment.setErrorTerminationFunction(() -> indicatorSet.add(TERMINATED_EXCEPTIONALLY));
+        environment.terminateExceptionally();
+
+        assertTrue(indicatorSet.contains(TERMINATED_EXCEPTIONALLY));
+    }
+
+}