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README
MIT

Unity Test CI

Copyright (c) 2007 - 2023 Unity Project by Mike Karlesky, Mark VanderVoord, and Greg Williams

Welcome to the Unity Test Project, one of the main projects of ThrowTheSwitch.org. Unity Test is a unit testing framework built for C, with a focus on working with embedded toolchains.

This project is made to test code targetting microcontrollers big and small. The core project is a single C file and a pair of headers, allowing it to be added to your existing build setup without too much headache. You may use any compiler you wish, and may use most existing build systems including Make, CMake, etc. If you'd like to leave the hard work to us, you might be interested in Ceedling, a build tool also by ThrowTheSwitch.org.

If you're new to Unity, we encourage you to tour the getting started guide.

You can also find the change log and known issues in our documentation.

Getting Started

The docs folder contains a getting started guide and much more tips about using Unity.

Unity Assertion Summary

For the full list, see UnityAssertionsReference.md.

Basic Validity Tests

TEST_ASSERT_TRUE(condition)

Evaluates whatever code is in condition and fails if it evaluates to false

TEST_ASSERT_FALSE(condition)

Evaluates whatever code is in condition and fails if it evaluates to true

TEST_ASSERT(condition)

Another way of calling TEST_ASSERT_TRUE

TEST_ASSERT_UNLESS(condition)

Another way of calling TEST_ASSERT_FALSE

TEST_FAIL()
TEST_FAIL_MESSAGE(message)

This test is automatically marked as a failure. The message is output stating why.

Numerical Assertions: Integers

TEST_ASSERT_EQUAL_INT(expected, actual)
TEST_ASSERT_EQUAL_INT8(expected, actual)
TEST_ASSERT_EQUAL_INT16(expected, actual)
TEST_ASSERT_EQUAL_INT32(expected, actual)
TEST_ASSERT_EQUAL_INT64(expected, actual)

Compare two integers for equality and display errors as signed integers. A cast will be performed to your natural integer size so often this can just be used. When you need to specify the exact size, you can use a specific version.

TEST_ASSERT_EQUAL_UINT(expected, actual)
TEST_ASSERT_EQUAL_UINT8(expected, actual)
TEST_ASSERT_EQUAL_UINT16(expected, actual)
TEST_ASSERT_EQUAL_UINT32(expected, actual)
TEST_ASSERT_EQUAL_UINT64(expected, actual)

Compare two integers for equality and display errors as unsigned integers. Like INT, there are variants for different sizes also.

TEST_ASSERT_EQUAL_HEX(expected, actual)
TEST_ASSERT_EQUAL_HEX8(expected, actual)
TEST_ASSERT_EQUAL_HEX16(expected, actual)
TEST_ASSERT_EQUAL_HEX32(expected, actual)
TEST_ASSERT_EQUAL_HEX64(expected, actual)

Compares two integers for equality and display errors as hexadecimal. Like the other integer comparisons, you can specify the size... here the size will also effect how many nibbles are shown (for example, HEX16 will show 4 nibbles).

TEST_ASSERT_EQUAL(expected, actual)

Another way of calling TEST_ASSERT_EQUAL_INT

TEST_ASSERT_INT_WITHIN(delta, expected, actual)

Asserts that the actual value is within plus or minus delta of the expected value. This also comes in size specific variants.

TEST_ASSERT_GREATER_THAN(threshold, actual)

Asserts that the actual value is greater than the threshold. This also comes in size specific variants.

TEST_ASSERT_LESS_THAN(threshold, actual)

Asserts that the actual value is less than the threshold. This also comes in size specific variants.

Arrays

_ARRAY

You can append _ARRAY to any of these macros to make an array comparison of that type. Here you will need to care a bit more about the actual size of the value being checked. You will also specify an additional argument which is the number of elements to compare. For example:

TEST_ASSERT_EQUAL_HEX8_ARRAY(expected, actual, elements)

_EACH_EQUAL

Another array comparison option is to check that EVERY element of an array is equal to a single expected value. You do this by specifying the EACH_EQUAL macro. For example:

TEST_ASSERT_EACH_EQUAL_INT32(expected, actual, elements)

Numerical Assertions: Bitwise

TEST_ASSERT_BITS(mask, expected, actual)

Use an integer mask to specify which bits should be compared between two other integers. High bits in the mask are compared, low bits ignored.

TEST_ASSERT_BITS_HIGH(mask, actual)

Use an integer mask to specify which bits should be inspected to determine if they are all set high. High bits in the mask are compared, low bits ignored.

TEST_ASSERT_BITS_LOW(mask, actual)

Use an integer mask to specify which bits should be inspected to determine if they are all set low. High bits in the mask are compared, low bits ignored.

TEST_ASSERT_BIT_HIGH(bit, actual)

Test a single bit and verify that it is high. The bit is specified 0-31 for a 32-bit integer.

TEST_ASSERT_BIT_LOW(bit, actual)

Test a single bit and verify that it is low. The bit is specified 0-31 for a 32-bit integer.

Numerical Assertions: Floats

TEST_ASSERT_FLOAT_WITHIN(delta, expected, actual)
TEST_ASSERT_DOUBLE_WITHIN(delta, expected, actual)

Asserts that the actual value is within plus or minus delta of the expected value.

TEST_ASSERT_FLOAT_NOT_WITHIN(delta, expected, actual)
TEST_ASSERT_DOUBLE_NOT_WITHIN(delta, expected, actual)

Asserts that the actual value is NOT within plus or minus delta of the expected value.

TEST_ASSERT_EQUAL_FLOAT(expected, actual)
TEST_ASSERT_EQUAL_DOUBLE(expected, actual)

Asserts that two floating point values are "equal" within a small % delta of the expected value.

TEST_ASSERT_NOT_EQUAL_FLOAT(expected, actual)
TEST_ASSERT_NOT_EQUAL_DOUBLE(expected, actual)

Asserts that two floating point values are NOT "equal" within a small % delta of the expected value.

TEST_ASSERT_LESS_THAN_FLOAT(threshold, actual)
TEST_ASSERT_LESS_THAN_DOUBLE(threshold, actual)
TEST_ASSERT_GREATER_THAN_FLOAT(threshold, actual)
TEST_ASSERT_GREATER_THAN_DOUBLE(threshold, actual)

Asserts that the actual value is less than or greater than the threshold.

There are also LESS_OR_EQUAL and GREATER_OR_EQUAL variations. These obey the same rules for equality as do TEST_ASSERT_EQUAL_FLOAT and TEST_ASSERT_EQUAL_DOUBLE: If the two values are within a small % delta of the expected value, the assertion will pass.

String Assertions

TEST_ASSERT_EQUAL_STRING(expected, actual)

Compare two null-terminate strings. Fail if any character is different or if the lengths are different.

TEST_ASSERT_EQUAL_STRING_LEN(expected, actual, len)

Compare two strings. Fail if any character is different, stop comparing after len characters.

TEST_ASSERT_EQUAL_STRING_MESSAGE(expected, actual, message)

Compare two null-terminate strings. Fail if any character is different or if the lengths are different. Output a custom message on failure.

TEST_ASSERT_EQUAL_STRING_LEN_MESSAGE(expected, actual, len, message)

Compare two strings. Fail if any character is different, stop comparing after len characters. Output a custom message on failure.

Pointer Assertions

Most pointer operations can be performed by simply using the integer comparisons above. However, a couple of special cases are added for clarity.

TEST_ASSERT_NULL(pointer)

Fails if the pointer is not equal to NULL

TEST_ASSERT_NOT_NULL(pointer)

Fails if the pointer is equal to NULL

Memory Assertions

TEST_ASSERT_EQUAL_MEMORY(expected, actual, len)

Compare two blocks of memory. This is a good generic assertion for types that can't be coerced into acting like standard types... but since it's a memory compare, you have to be careful that your data types are packed.

_MESSAGE

You can append \_MESSAGE to any of the macros to make them take an additional argument. This argument is a string that will be printed at the end of the failure strings. This is useful for specifying more information about the problem.

The MIT License (MIT) Copyright (c) <year> 2007-24 Mike Karlesky, Mark VanderVoord, Greg Williams Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions: The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

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