Testing expansion (#177)

Incremental tests added to project
Functional test added to test package to showcase usage and streamline on GraphConnector test suite.

src/internal/testing/envvars_test.go

@@ -0,0 +1,45 @@
+package testing
+
+import (
+	"os"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/suite"
+)
+
+type EnvvarsTestSuite struct {
+	suite.Suite
+}
+
+func TestEnvvarsSuite(t *testing.T) {
+	suite.Run(t, new(EnvvarsTestSuite))
+}
+
+func (suite EnvvarsTestSuite) TestRunOnAny() {
+	env_variable := "TEST_ENVVARS_SUITE"
+	os.Setenv(env_variable, "1")
+	table := []struct {
+		name     string
+		param    string
+		function assert.ErrorAssertionFunc
+	}{
+		{
+			name:     "Valid Environment",
+			param:    env_variable,
+			function: assert.NoError,
+		},
+		{
+			name:     "Invalid Environment",
+			param:    "TEST_ENVVARS_SUITE_INVALID",
+			function: assert.Error,
+		},
+	}
+	for _, test := range table {
+		suite.T().Run(test.name, func(t *testing.T) {
+			result := RunOnAny(test.param)
+			test.function(suite.T(), result)
+		})
+	}
+	os.Unsetenv(env_variable)
+}