create two projects

app/BUILD.bazel → app/projectA/BUILD.bazel

@@ -8,7 +8,7 @@ py_test(
     name="test_calculator",
     srcs=["test_calculator.py"],
     deps = [
-        "//app:calculator",
+        "//app/projectA:calculator",
     ]
 )
 

app/test_calculator.py → app/projectA/test_calculator.py

@@ -1,5 +1,5 @@
 
-from app.calculator import Calculator
+from app.projectA.calculator import Calculator
 
 import unittest
 

app/projectB/BUILD.bazel

@@ -0,0 +1,15 @@
+py_library(
+    name="adder",
+    srcs=["adder.py"],
+
+)
+
+py_test(
+    name="test_adder",
+    srcs=["test_adder.py"],
+    deps = [
+        "//app/projectB:adder",
+    ]
+)
+
+exports_files(["codecov_wrapper.sh"])

app/projectB/adder.py

@@ -0,0 +1,3 @@
+class Adder:
+    def add(self, x, y):
+        return x + y

app/projectB/codecov_wrapper.sh

@@ -0,0 +1,16 @@
+#/bin/bash
+
+# `bazel coverage --run_under foo :bar` basically translates to:
+#     foo pytest --cov bar/src/a.py bar/src/b.py
+# We want to run that `pytest` command unmodified, as below:
+"$@"
+
+# codecov doesn't recognise pylcov.dat as a coverage report, renaming it to lcov.dat so codecov can acknowledge it  
+mv $COVERAGE_DIR/pylcov.dat $COVERAGE_DIR/lcov.dat
+
+# uploading coverage
+codecovcli -v create-commit -t $CODECOV_TOKEN
+codecovcli -v create-report -t $CODECOV_TOKEN
+codecovcli -v do-upload -t $CODECOV_TOKEN -s $COVERAGE_DIR
+
+

app/projectB/test_adder.py

@@ -0,0 +1,9 @@
+import unittest
+
+from app.projectB.adder import Adder
+
+
+
+class TestAdder(unittest.TestCase):
+    def test_adder(self, x, y):
+        assert x + y == Adder.add(x, y)