diff --git a/backend/internal/config/config_test.go b/backend/internal/config/config_test.go
index 2843880..db54a45 100644
--- a/backend/internal/config/config_test.go
+++ b/backend/internal/config/config_test.go
@@ -198,3 +198,115 @@ func TestSwaggerSchemesTrimmed(t *testing.T) {
 		t.Errorf("expected SwaggerSchemes [https http], got %v", cfg.SwaggerSchemes)
 	}
 }
+
+func TestGetEnv(t *testing.T) {
+	t.Setenv("TEST_CONFIG_STRING", "value")
+
+	if got := getEnv("TEST_CONFIG_STRING", "fallback"); got != "value" {
+		t.Errorf("expected getEnv to return value, got %q", got)
+	}
+	if got := getEnv("MISSING_CONFIG_STRING", "fallback"); got != "fallback" {
+		t.Errorf("expected getEnv to return fallback, got %q", got)
+	}
+}
+
+func TestGetEnvInt(t *testing.T) {
+	tests := []struct {
+		name     string
+		value    string
+		fallback int
+		expected int
+	}{
+		{name: "valid integer", value: "42", fallback: 10, expected: 42},
+		{name: "invalid integer", value: "not-a-number", fallback: 10, expected: 10},
+		{name: "empty value", value: "", fallback: 7, expected: 7},
+		{name: "negative integer", value: "-5", fallback: 3, expected: -5},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			t.Setenv("TEST_CONFIG_INT", tt.value)
+			if got := getEnvInt("TEST_CONFIG_INT", tt.fallback); got != tt.expected {
+				t.Errorf("expected %d, got %d", tt.expected, got)
+			}
+		})
+	}
+}
+
+func TestGetEnvDuration(t *testing.T) {
+	tests := []struct {
+		name     string
+		value    string
+		fallback time.Duration
+		expected time.Duration
+	}{
+		{name: "valid duration", value: "45m", fallback: time.Hour, expected: 45 * time.Minute},
+		{name: "invalid duration", value: "not-a-duration", fallback: time.Minute, expected: time.Minute},
+		{name: "empty value", value: "", fallback: 30 * time.Second, expected: 30 * time.Second},
+		{name: "complex duration", value: "1h30m", fallback: time.Minute, expected: 90 * time.Minute},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			t.Setenv("TEST_CONFIG_DURATION", tt.value)
+			if got := getEnvDuration("TEST_CONFIG_DURATION", tt.fallback); got != tt.expected {
+				t.Errorf("expected %v, got %v", tt.expected, got)
+			}
+		})
+	}
+}
+
+func TestGetEnvFloat(t *testing.T) {
+	tests := []struct {
+		name     string
+		value    string
+		fallback float64
+		expected float64
+	}{
+		{name: "valid float", value: "3.14", fallback: 1.2, expected: 3.14},
+		{name: "valid integer string", value: "2", fallback: 1.2, expected: 2},
+		{name: "invalid float", value: "invalid", fallback: 1.2, expected: 1.2},
+		{name: "empty value", value: "", fallback: 2.5, expected: 2.5},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			t.Setenv("TEST_CONFIG_FLOAT", tt.value)
+			if got := getEnvFloat("TEST_CONFIG_FLOAT", tt.fallback); got != tt.expected {
+				t.Errorf("expected %v, got %v", tt.expected, got)
+			}
+		})
+	}
+}
+
+func TestGetEnvStringSlice(t *testing.T) {
+	tests := []struct {
+		name     string
+		value    string
+		fallback []string
+		expected []string
+	}{
+		{name: "comma separated", value: "a,b,c", fallback: []string{"fallback"}, expected: []string{"a", "b", "c"}},
+		{name: "single value", value: "solo", fallback: []string{"fallback"}, expected: []string{"solo"}},
+		{name: "trim spaces", value: " a ,  b ", fallback: []string{"fallback"}, expected: []string{"a", "b"}},
+		{name: "empty entries", value: "a,,b,", fallback: []string{"fallback"}, expected: []string{"a", "b"}},
+		{name: "trailing spaces", value: "one ,two ", fallback: []string{"fallback"}, expected: []string{"one", "two"}},
+		{name: "only separators", value: " , , ", fallback: []string{"fallback"}, expected: []string{"fallback"}},
+		{name: "empty value", value: "", fallback: []string{"fallback"}, expected: []string{"fallback"}},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			t.Setenv("TEST_CONFIG_SLICE", tt.value)
+			got := getEnvStringSlice("TEST_CONFIG_SLICE", tt.fallback)
+			if len(got) != len(tt.expected) {
+				t.Fatalf("expected %v, got %v", tt.expected, got)
+			}
+			for i, expected := range tt.expected {
+				if got[i] != expected {
+					t.Fatalf("expected %v, got %v", tt.expected, got)
+				}
+			}
+		})
+	}
+}