From 802f3c5a1751ba4d35fb7e7058c45920d1dc0779 Mon Sep 17 00:00:00 2001
From: Yongwei Xing <yongwei.xing@liulishuo.com>
Date: Thu, 4 Mar 2021 16:41:25 +0800
Subject: [PATCH] add testcase for util

---
 .github/workflows/go.yml |  2 +-
 utils_test.go            | 31 +++++++++++++++++++++++++++++++
 2 files changed, 32 insertions(+), 1 deletion(-)
 create mode 100644 utils_test.go

diff --git a/.github/workflows/go.yml b/.github/workflows/go.yml
index d25b77c..f91a20b 100644
--- a/.github/workflows/go.yml
+++ b/.github/workflows/go.yml
@@ -22,4 +22,4 @@ jobs:
       run: go build -v ./*.go
 
     - name: Test
-      run: go test -v ./...
+      run: go test -v ./*.go
diff --git a/utils_test.go b/utils_test.go
new file mode 100644
index 0000000..d8018f6
--- /dev/null
+++ b/utils_test.go
@@ -0,0 +1,31 @@
+package generativeart
+
+import (
+	"math"
+	"testing"
+)
+
+func TestDistance(t *testing.T) {
+	type args struct {
+		x1 float64
+		y1 float64
+		x2 float64
+		y2 float64
+	}
+	tests := []struct {
+		name string
+		args args
+		want float64
+	}{
+		{name: "testcase1", args: args{x1:0, y1:0, x2:0, y2:0}, want: 0},
+		{name: "testcase2", args: args{x1:0, y1:3, x2:4, y2:0}, want: 5},
+		{name: "testcase3", args: args{x1:1, y1:1, x2:0, y2:0}, want: 1.414213562},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			if got := Distance(tt.args.x1, tt.args.y1, tt.args.x2, tt.args.y2); math.Abs(got-tt.want)>0.00001 {
+				t.Errorf("Distance() = %v, want %v", got, tt.want)
+			}
+		})
+	}
+}