adds unit test coverage for getEnv

internal/config/envconfig_test.go

@@ -0,0 +1,76 @@
+package config
+
+import (
+	"strconv"
+	"testing"
+)
+
+func TestGetEnv(t *testing.T) {
+	var (
+		expected_string        string  = "This is a test string."
+		expected_bool          bool    = true
+		expected_int           int     = 100
+		expected_int64         int64   = 100
+		expected_float64       float64 = 100.001
+		expected_unset_default string  = "This is a default value."
+	)
+
+	// string
+	t.Setenv("TEST_STRING", expected_string)
+	test_string, err := getEnv("TEST_STRING", "This is a default String")
+	if err != nil {
+		t.Fatalf("Error calling getEnv: %v", err)
+	}
+	if test_string != expected_string {
+		t.Fatalf("Expected %s, got %s", expected_string, test_string)
+	}
+
+	// bool
+	t.Setenv("TEST_BOOL", strconv.FormatBool(expected_bool))
+	test_bool, err := getEnv("TEST_BOOL", false)
+	if err != nil {
+		t.Fatalf("Error calling getEnv: %v", err)
+	}
+	if test_bool != expected_bool {
+		t.Fatalf("Expected %t, got %t", expected_bool, test_bool)
+	}
+
+	// int
+	t.Setenv("TEST_INT", strconv.FormatInt(int64(expected_int), 10))
+	test_int, err := getEnv("TEST_INT", 999)
+	if err != nil {
+		t.Fatalf("Error calling getEnv: %v", err)
+	}
+	if test_int != expected_int {
+		t.Fatalf("Expected %d, got %d", expected_int, test_int)
+	}
+
+	// int64
+	t.Setenv("TEST_INT64", strconv.FormatInt(expected_int64, 10))
+	test_int64, err := getEnv("TEST_INT64", int64(999))
+	if err != nil {
+		t.Fatalf("Error calling getEnv: %v", err)
+	}
+	if test_int64 != expected_int64 {
+		t.Fatalf("Expected %d, got %d", expected_int64, test_int64)
+	}
+
+	// float64
+	t.Setenv("TEST_FLOAT64", strconv.FormatFloat(expected_float64, 'f', 3, 32))
+	test_float64, err := getEnv("TEST_FLOAT64", 999.99)
+	if err != nil {
+		t.Fatalf("Error calling getEnv: %v", err)
+	}
+	if test_float64 != expected_float64 {
+		t.Fatalf("Expected %f, got %f", expected_float64, test_float64)
+	}
+
+	// unset or missing environment variable
+	test_unset, err := getEnv("TEST_DEFAULT", expected_unset_default)
+	if err != nil {
+		t.Fatalf("Error calling getEnv: %v", err)
+	}
+	if test_unset != expected_unset_default {
+		t.Fatalf("Expected %s, got %s", expected_unset_default, test_unset)
+	}
+}