add tests for StandardInputSupplier

Author: fmbenhassine

src/test/java/io/github/benas/unixstream/StandardInputSupplierTest.java

@@ -0,0 +1,44 @@
+package io.github.benas.unixstream;
+
+import org.junit.Before;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.mockito.Mock;
+import org.mockito.Mockito;
+import org.mockito.junit.MockitoJUnitRunner;
+
+import java.io.BufferedReader;
+import java.io.IOException;
+
+import static org.mockito.Mockito.verify;
+
+@RunWith(MockitoJUnitRunner.class)
+public class StandardInputSupplierTest {
+
+    @Mock
+    private BufferedReader bufferedReader;
+    @Mock
+    private IOException exception;
+
+    private StandardInputSupplier standardInputSupplier;
+
+    @Before
+    public void setUp() throws Exception {
+        standardInputSupplier = new StandardInputSupplier(bufferedReader);
+    }
+
+    @Test
+    public void get() throws Exception {
+        standardInputSupplier.get();
+
+        verify(bufferedReader).readLine();
+    }
+
+    @Test(expected = RuntimeException.class)
+    public void get_whenBufferedReaderThrowsException() throws Exception {
+        Mockito.when(bufferedReader.readLine()).thenThrow(exception);
+
+        standardInputSupplier.get();
+    }
+
+}