### Question:
DataTypeConstraintExpressionView implements DataTypeConstraintExpression.View { @Override public void setExpressionValue(final String value) { expression.value = 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 testSetExpressionValue() { final String expectedValue = "expression"; view.setExpressionValue(expectedValue); final String actualValue = expression.value; assertEquals(expectedValue, actualValue); }