### Question:
DataTypeConstraintExpressionView implements DataTypeConstraintExpression.View { @Override public String getExpressionValue() { return expression.value; } @Inject  DataTypeConstraintExpressionView(final HTMLTextAreaElement expression); @Override void init(final DataTypeConstraintExpression presenter); @Override void setPlaceholder(final String placeholder); @Override String getExpressionValue(); @Override void setExpressionValue(final String value);  }### Answer:
@Test public void testGetExpressionValue() { final String expectedValue = "expression"; expression.value = expectedValue; final String actualValue = view.getExpressionValue(); assertEquals(expectedValue, actualValue); }