Add hourly generated text contract

internal/generatedtext/hourly_test.go

@@ -0,0 +1,86 @@
+package generatedtext
+
+import (
+	"strings"
+	"testing"
+)
+
+func TestValidateHourlyNormalizesJSON(t *testing.T) {
+	value, normalized, err := ValidateHourly([]byte(`{
+		"timing": "  main window late morning ",
+		"summary": " Storm chances increase. ",
+		"confidence": " Medium ",
+		"impacts": " Brief downpours. "
+	}`))
+	if err != nil {
+		t.Fatalf("ValidateHourly() error = %v", err)
+	}
+	if value.Summary != "Storm chances increase." {
+		t.Fatalf("Summary = %q, want trimmed summary", value.Summary)
+	}
+	want := `{"summary":"Storm chances increase.","timing":"main window late morning","impacts":"Brief downpours.","confidence":"Medium"}`
+	if string(normalized) != want {
+		t.Fatalf("normalized = %s, want %s", normalized, want)
+	}
+}
+
+func TestValidateHourlyOmitsEmptyConfidence(t *testing.T) {
+	_, normalized, err := ValidateHourly([]byte(`{
+		"summary": "Storm chances increase.",
+		"timing": "Late morning.",
+		"impacts": "Brief downpours.",
+		"confidence": "   "
+	}`))
+	if err != nil {
+		t.Fatalf("ValidateHourly() error = %v", err)
+	}
+	want := `{"summary":"Storm chances increase.","timing":"Late morning.","impacts":"Brief downpours."}`
+	if string(normalized) != want {
+		t.Fatalf("normalized = %s, want %s", normalized, want)
+	}
+}
+
+func TestValidateHourlyRejectsInvalidInput(t *testing.T) {
+	tests := []struct {
+		name string
+		in   string
+		want string
+	}{
+		{
+			name: "malformed",
+			in:   `{`,
+			want: "decode hourly generated text",
+		},
+		{
+			name: "unknown field",
+			in:   `{"summary":"Storm chances increase.","timing":"Late morning.","impacts":"Brief downpours.","extra":"value"}`,
+			want: `unknown field "extra"`,
+		},
+		{
+			name: "missing summary",
+			in:   `{"timing":"Late morning.","impacts":"Brief downpours."}`,
+			want: "summary is required",
+		},
+		{
+			name: "blank timing",
+			in:   `{"summary":"Storm chances increase.","timing":"  ","impacts":"Brief downpours."}`,
+			want: "timing is required",
+		},
+		{
+			name: "multiple values",
+			in:   `{"summary":"Storm chances increase.","timing":"Late morning.","impacts":"Brief downpours."} {}`,
+			want: "multiple JSON values",
+		},
+	}
+	for _, test := range tests {
+		t.Run(test.name, func(t *testing.T) {
+			_, _, err := ValidateHourly([]byte(test.in))
+			if err == nil {
+				t.Fatal("ValidateHourly() error = nil, want error")
+			}
+			if !strings.Contains(err.Error(), test.want) {
+				t.Fatalf("ValidateHourly() error = %v, want %q", err, test.want)
+			}
+		})
+	}
+}