How to compare test-coverage value with specific threshold for Golang test cases

I want to get the test coverage and compare with user defined threshold. I tried below code in makefile I am referring this link. It is written in .yml file but I am trying to write it in a Makefile.

.PHONY: lint    
testcoverage=$(go tool cover -func coverage.out | grep total | grep -Eo '[0-9]+\.[0-9]+')
echo ${testcoverage}
if (${testcoverage} -lt 50 ); then \
  echo "Please add more unit tests or adjust threshold to a lower value."; \
  echo "Failed"
  exit 1
else \
  echo "OK"; \
fi

It does not print anything on echo ${totaltestcoverage} and gives answer OK even if my totaltestcoverage is 40.

Can anyone please help me with a better way to get the test coverage and compare with user defined threshold?

Thanks in advance.

Solution

You can try this

.PHONY: lint

testcoverage := $(shell go tool cover -func=coverage.out | grep total | grep -Eo '[0-9]+\.[0-9]+')
threshold = 50

test:
    @go test -coverprofile=coverage.out -covermode=count  ./...

check-coverage:
    @echo "Test coverage: $(testcoverage)"
    @echo "Test Threshold: $(threshold)"
    @echo "-----------------------"

    @if [ "$(shell echo "$(testcoverage) < $(threshold)" | bc -l)" -eq 1 ]; then \
        echo "Please add more unit tests or adjust the threshold to a lower value."; \
        echo "Failed"; \
        exit 1; \
    else \
        echo "OK"; \
    fi