establish testing pattern

libwx_test.go

@@ -1,17 +1,3 @@
 package libwx
 
-import (
-	"testing"
-)
-
-func Test_RelHumidity_type(t *testing.T) {
-	var sut interface{} = RelHumidity(50)
-	switch sut.(type) {
-	case int:
-		// ok
-	case string:
-		t.Fatal("RelHumidity should not be a string")
-	default:
-		t.Fatalf("RelHumidity is %T", sut)
-	}
-}
+// TODO(cdzombak): testing for calculations in libwx.go

temperature_test.go

@@ -0,0 +1,39 @@
+package libwx
+
+import "testing"
+
+func TestTempF_C(t *testing.T) {
+	pairs := []struct {
+		input    TempF
+		expected TempC
+	}{
+		{TempF(32), TempC(0)},
+		{TempF(212), TempC(100)},
+		{TempF(98.6), TempC(37)},
+		{TempF(-40), TempC(-40)},
+	}
+
+	for _, pair := range pairs {
+		if Float64Compare(float64(pair.expected), float64(pair.input.C()), Tolerance001) != 0 {
+			t.Errorf("for input %v: expected %v, got %v", pair.input, pair.expected, pair.input.C())
+		}
+	}
+}
+
+func TestTempC_F(t *testing.T) {
+	pairs := []struct {
+		input    TempC
+		expected TempF
+	}{
+		{TempC(0), TempF(32)},
+		{TempC(100), TempF(212)},
+		{TempC(37), TempF(98.6)},
+		{TempC(-40), TempF(-40)},
+	}
+
+	for _, pair := range pairs {
+		if Float64Compare(float64(pair.expected), float64(pair.input.F()), Tolerance001) != 0 {
+			t.Errorf("for input %v: expected %v, got %v", pair.input, pair.expected, pair.input.F())
+		}
+	}
+}