Add startsWith expression function #4840
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graytaylor0
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| final ExpressionFunction startsWithExpressionFunction = createObjectUnderTest(); | ||
| final String testKey = "test_key"; | ||
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| assertThrows(RuntimeException.class, () -> startsWithExpressionFunction.evaluate(List.of("abcd"), testEvent, mock(Function.class))); |
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It would be better to split this test up using arguments provider.
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| private Event testEvent; | ||
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| @BeforeEach |
| assertThrows(RuntimeException.class, () -> startsWithExpressionFunction.evaluate(List.of("\"abc\"", "/"+testKey), createTestEvent(Map.of(testKey, 1234)), mock(Function.class))); | ||
| } | ||
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| private static Stream<Arguments> ValidStartsWithProvider() { |
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Suggested change
| private static Stream<Arguments> ValidStartsWithProvider() { | |
| private static Stream<Arguments> validStartsWithProvider() { |
Give a method name
| final ExpressionFunction objectUnderTest = createObjectUnderTest(); | ||
| assertThat(objectUnderTest.getFunctionName(), equalTo(STARTS_WITH_FUNCTION_NAME)); | ||
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| final Object result = objectUnderTest.evaluate(List.of("/" + key, "\"" + prefix + "\""), testEvent, mock(Function.class)); |
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It looks like you are supporting a key for the substring part. Add a unit test for that as well.
| return false; | ||
| } | ||
| if (!(obj instanceof String)) { | ||
| throw new RuntimeException(String.format("startsWith() takes only string type arguments. \"%s\" is not of type string", obj)); |
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| throw new RuntimeException(String.format("startsWith() takes only string type arguments. \"%s\" is not of type string", obj)); | |
| throw new RuntimeException(String.format("startsWith() only operates on string types. The value at \"%s"\ is \"%s\" which is not a string type.", str, obj)); |
This error may be confusing. In this case, startsWith() is given a key and the value is not of type string.
| if (!(arg instanceof String)) { | ||
| throw new RuntimeException(String.format("startsWith() takes only string type arguments. \"%s\" is not of type string", arg)); | ||
| } | ||
| String str = (String) arg; |
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Rename for clarity. Perhaps stringOrKey.
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dlvenable
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Signed-off-by: Taylor Gray <[email protected]>
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Description
Adds a
startsWithfunction to Data Prepper expressions, similar to thecontainsfunction, but for checking if a String has a prefix of some other String.Check List
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