Added a /conditions/current endpoint with computed best-guess values for current conditions

internal/application/units/converter_test.go

@@ -41,3 +41,32 @@ func TestUSConverterSpeedKmhToOutput(t *testing.T) {
 		t.Fatalf("expected 10.0 mph, got %v", got)
 	}
 }
+
+func TestMetricConverterPassthrough(t *testing.T) {
+	c := MetricConverter{}
+
+	if got := c.TemperatureCToOutput(nil); got != nil {
+		t.Fatalf("expected nil for nil temperature input")
+	}
+	if got := c.SpeedKmhToOutput(nil); got != nil {
+		t.Fatalf("expected nil for nil speed input")
+	}
+
+	temp := 12.3456
+	gotTemp := c.TemperatureCToOutput(&temp)
+	if gotTemp == nil || *gotTemp != temp {
+		t.Fatalf("expected temperature passthrough %v, got %v", temp, gotTemp)
+	}
+	if gotTemp == &temp {
+		t.Fatalf("expected temperature output to be a clone pointer")
+	}
+
+	speed := 14.2
+	gotSpeed := c.SpeedKmhToOutput(&speed)
+	if gotSpeed == nil || *gotSpeed != speed {
+		t.Fatalf("expected speed passthrough %v, got %v", speed, gotSpeed)
+	}
+	if gotSpeed == &speed {
+		t.Fatalf("expected speed output to be a clone pointer")
+	}
+}