Added test framework

[ClemensLinnhoff]

Reference to a related issue in the repository Fixes #17

Add a description Added google test framework and created an exemplary unit test for the coordinate transform.

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:speech_balloon: Output from clang-tidy

src/HelloWorldSensor.cpp

/src/HelloWorldSensor.cpp:60:5: warning: [cppcoreguidelines-pro-type-member-init] > uninitialized record type: 'myaddr'

```cpp union Addrconv ^ ```

/src/HelloWorldSensor.cpp:69:12: warning: [cppcoreguidelines-pro-type-union-access] > do not access members of unions; use (boost::)variant instead

```cpp myaddr.base.lo = lo; ^ ```

/src/HelloWorldSensor.cpp:70:12: warning: [cppcoreguidelines-pro-type-union-access] > do not access members of unions; use (boost::)variant instead

```cpp myaddr.base.hi = hi; ^ ```

/src/HelloWorldSensor.cpp:71:12: warning: [cppcoreguidelines-pro-type-reinterpret-cast] > do not use reinterpret_cast

```cpp return reinterpret_cast(myaddr.address); ^ ```

/src/HelloWorldSensor.cpp:71:43: warning: [cppcoreguidelines-pro-type-union-access] > do not access members of unions; use (boost::)variant instead

```cpp return reinterpret_cast(myaddr.address); ^ ```

/src/HelloWorldSensor.cpp:82:5: warning: [cppcoreguidelines-pro-type-member-init] > uninitialized record type: 'myaddr'

```cpp union Addrconv ^ ```

/src/HelloWorldSensor.cpp:91:12: warning: [cppcoreguidelines-pro-type-union-access] > do not access members of unions; use (boost::)variant instead

```cpp myaddr.address = reinterpret_cast(ptr); ^ ```

/src/HelloWorldSensor.cpp:91:22: warning: [cppcoreguidelines-pro-type-reinterpret-cast] > do not use reinterpret_cast

```cpp myaddr.address = reinterpret_cast(ptr); ^ ```

/src/HelloWorldSensor.cpp:92:17: warning: [cppcoreguidelines-pro-type-union-access] > do not access members of unions; use (boost::)variant instead

```cpp hi = myaddr.base.hi; ^ ```

/src/HelloWorldSensor.cpp:93:17: warning: [cppcoreguidelines-pro-type-union-access] > do not access members of unions; use (boost::)variant instead

```cpp lo = myaddr.base.lo; ^ ```

/src/HelloWorldSensor.cpp:231:30: warning: [readability-convert-member-functions-to-static] > method 'DoStart' can be made static

```cpp fmi2Status HelloWorldSensor::DoStart(fmi2Boolean tolerance_defined, fmi2Real tolerance, fmi2Real start_time, fmi2Boolean stop_time_defined, fmi2Real stop_time) ^ ```

/src/HelloWorldSensor.cpp:236:30: warning: [readability-convert-member-functions-to-static] > method 'DoEnterInitializationMode' can be made static

```cpp fmi2Status HelloWorldSensor::DoEnterInitializationMode() ^ ```

/src/HelloWorldSensor.cpp:273:13: warning: [cppcoreguidelines-pro-bounds-constant-array-index] > do not use array subscript when the index is not an integer constant expression

```cpp matrix_trans[j][i] = matrix_in[i][j]; ^ ```

/src/HelloWorldSensor.cpp:273:34: warning: [cppcoreguidelines-pro-bounds-constant-array-index] > do not use array subscript when the index is not an integer constant expression

```cpp matrix_trans[j][i] = matrix_in[i][j]; ^ ```

/src/HelloWorldSensor.cpp:299:29: warning: [cppcoreguidelines-pro-bounds-array-to-pointer-decay] > do not implicitly decay an array into a pointer; consider using gsl::array_view or an explicit cast instead

```cpp TransposeRotationMatrix(matrix, matrix_trans); ^ ```

/src/HelloWorldSensor.cpp:299:37: warning: [cppcoreguidelines-pro-bounds-array-to-pointer-decay] > do not implicitly decay an array into a pointer; consider using gsl::array_view or an explicit cast instead

```cpp TransposeRotationMatrix(matrix, matrix_trans); ^ ```

/src/HelloWorldSensor.cpp:369:80: warning: [cppcoreguidelines-avoid-magic-numbers,readability-magic-numbers] > 0.866025 is a magic number; consider replacing it with a named constant

```cpp if ((distance <= actual_range) && (rel_x / distance > 0.866025)) ^ ```

/src/HelloWorldSensor.cpp:374:84: warning: [cppcoreguidelines-avoid-magic-numbers,readability-magic-numbers] > 2.0 is a magic number; consider replacing it with a named constant

```cpp obj->mutable_header()->set_existence_probability(cos((2.0 * distance - actual_range) / actual_range)); ^ ```

/src/HelloWorldSensor.cpp:447:30: warning: [readability-convert-member-functions-to-static] > method 'DoTerm' can be made static

```cpp fmi2Status HelloWorldSensor::DoTerm() ^ ```

/src/HelloWorldSensor.cpp:458:1: warning: [cppcoreguidelines-pro-type-member-init] > constructor does not initialize these fields: boolean_vars_, integer_vars_, real_vars_

```cpp HelloWorldSensor::HelloWorldSensor(fmi2String theinstance_name, ^ ```

/src/HelloWorldSensor.cpp:525:5: warning: [cppcoreguidelines-owning-memory] > initializing non-owner 'HelloWorldSensor *' with a newly created 'gsl::owner<>'

```cpp auto* myc = new HelloWorldSensor(instance_name, fmu_type, fmu_guid, fmu_resource_location, functions, visible, logging_on); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ```

/src/HelloWorldSensor.cpp:550:9: warning: [cppcoreguidelines-owning-memory] > deleting a pointer through a type that is not marked 'gsl::owner<>'; consider using a smart pointer instead

```cpp delete myc; ^ ~~~ /home/runner/work/sl-1-0-sensor-model-repository-template/sl-1-0-sensor-model-repository-template/src/HelloWorldSensor.cpp:525:5: note: variable declared here auto* myc = new HelloWorldSensor(instance_name, fmu_type, fmu_guid, fmu_resource_location, functions, visible, logging_on); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ```

/src/HelloWorldSensor.cpp:618:24: warning: [cppcoreguidelines-pro-bounds-constant-array-index] > do not use array subscript when the index is not an integer constant expression

```cpp value[i] = real_vars_[vr[i]]; ^ ```

/src/HelloWorldSensor.cpp:642:24: warning: [cppcoreguidelines-pro-bounds-constant-array-index] > do not use array subscript when the index is not an integer constant expression

```cpp value[i] = integer_vars_[vr[i]]; ^ ```

/src/HelloWorldSensor.cpp:659:24: warning: [cppcoreguidelines-pro-bounds-constant-array-index] > do not use array subscript when the index is not an integer constant expression

```cpp value[i] = boolean_vars_[vr[i]]; ^ ```

/src/HelloWorldSensor.cpp:676:24: warning: [cppcoreguidelines-pro-bounds-constant-array-index] > do not use array subscript when the index is not an integer constant expression

```cpp value[i] = string_vars_[vr[i]].c_str(); ^ ```

/src/HelloWorldSensor.cpp:693:13: warning: [cppcoreguidelines-pro-bounds-constant-array-index] > do not use array subscript when the index is not an integer constant expression

```cpp real_vars_[vr[i]] = value[i]; ^ ```

/src/HelloWorldSensor.cpp:710:13: warning: [cppcoreguidelines-pro-bounds-constant-array-index] > do not use array subscript when the index is not an integer constant expression

```cpp integer_vars_[vr[i]] = value[i]; ^ ```

/src/HelloWorldSensor.cpp:727:13: warning: [cppcoreguidelines-pro-bounds-constant-array-index] > do not use array subscript when the index is not an integer constant expression

```cpp boolean_vars_[vr[i]] = value[i]; ^ ```

/src/HelloWorldSensor.cpp:744:13: warning: [cppcoreguidelines-pro-bounds-constant-array-index] > do not use array subscript when the index is not an integer constant expression

```cpp string_vars_[vr[i]] = value[i]; ^ ```

/src/HelloWorldSensor.cpp:834:5: warning: [cppcoreguidelines-owning-memory] > deleting a pointer through a type that is not marked 'gsl::owner<>'; consider using a smart pointer instead

```cpp delete myc; ^ ~~~ /home/runner/work/sl-1-0-sensor-model-repository-template/sl-1-0-sensor-model-repository-template/src/HelloWorldSensor.cpp:832:5: note: variable declared here auto* myc = (HelloWorldSensor*)c; ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ```