add qs joins

join_test.go

@@ -0,0 +1,52 @@
+package qs
+
+import "testing"
+
+func TestReadJoins(t *testing.T) {
+	type TestCase struct {
+		Input  string
+		Opt    *ReadJoinsOptions
+		Output Joins
+		Err    error
+	}
+
+	testCases := []TestCase{
+		{Input: ""},
+		{
+			Input:  "join=ingredient",
+			Output: Joins{"ingredient": true},
+		},
+		{
+			Input:  "join=author&join=ingredient",
+			Output: Joins{"author": true, "ingredient": true},
+		},
+	}
+
+	for n, tc := range testCases {
+		t.Logf("(%d) Testing %q with options %+v", n, tc.Input, tc.Opt)
+
+		joins, err := ReadStringJoins(tc.Input, nil)
+
+		if err != tc.Err {
+			t.Errorf("Expected error %v, got %v", tc.Err, err)
+		}
+		if tc.Err != nil {
+			continue
+		}
+
+		if tc.Output == nil && joins != nil {
+			t.Error("Expected nil")
+			continue
+		}
+
+		if len(joins) != len(tc.Output) {
+			t.Errorf("Expected %d joins, got %d", len(tc.Output), len(joins))
+		}
+
+		for name, join := range tc.Output {
+			if join != joins[name] {
+				t.Errorf("Expected %t for join %s, got %t", join, name, joins[name])
+			}
+		}
+	}
+}