Add tests (#2)

* Initial tests draft.

* Add tests for parsing jwt token

* Further code optimisations

details_test.go

@@ -0,0 +1,83 @@
+package main
+
+import "testing"
+
+func (suite *Tests) Test_extractClaimsFromJWTHeader() {
+	jwt_token_for_tests := "eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJ0b2tlbl90eXBlIjoiYWNjZXNzIiwiSGFzdXJhIjp7IngtaGFzdXJhLWFsbG93ZWQtcm9sZXMiOlsiZ3Vlc3QiLCJ1c2VyIiwiZ3JvdXBhZG1pbiIsInBheWFkbWluIl0sIngtaGFzdXJhLWRlZmF1bHQtcm9sZSI6Imd1ZXN0IiwieC1oYXN1cmEtdXNlci1pZCI6IjE2NyIsIngtaGFzdXJhLXVzZXItdXVpZCI6ImRkM2U2ZTM1LTA0MDktNDNiMC1iZmYxLWNlZjNjNmVkNWYxMCJ9LCJpc3MiOiJBdXRoU2VydmljZSIsImV4cCI6MTY5NjgwMTcyNiwibmJmIjoxNjk2NTg1NzI2LCJpYXQiOjE2OTY1ODU3MjZ9.dsJ5JKzG5tXOlqeZ_Gfe2XC-vyrcwtYwOGfhvt8q9UY"
+
+	type args struct {
+		authorization string
+	}
+
+	tests := []struct {
+		name           string
+		args           args
+		wantUsr        string
+		wantRole       string
+		jwt_token_path string
+		jwt_role_path  string
+	}{
+		{
+			name:     "test_empty",
+			wantUsr:  "-",
+			wantRole: "-",
+		},
+		{
+			name: "test_invalid_path",
+			args: args{
+				authorization: jwt_token_for_tests,
+			},
+			wantUsr:        "-",
+			wantRole:       "-",
+			jwt_token_path: "invalid",
+		},
+		{
+			name: "test_invalid_role_path",
+			args: args{
+				authorization: jwt_token_for_tests,
+			},
+			wantUsr:       "-",
+			wantRole:      "-",
+			jwt_role_path: "invalid",
+		},
+		{
+			name: "test_valid",
+			args: args{
+				authorization: jwt_token_for_tests,
+			},
+			wantUsr:        "167",
+			wantRole:       "guest",
+			jwt_token_path: "Hasura.x-hasura-user-id",
+			jwt_role_path:  "Hasura.x-hasura-default-role",
+		},
+		{
+			name: "test_invalid_token",
+			args: args{
+				authorization: "invalid",
+			},
+			wantUsr:  "-",
+			wantRole: "-",
+		},
+		{
+			name: "test_invalid_three_part_token",
+			args: args{
+				authorization: "invalid.threepart.token",
+			},
+			wantUsr:  "-",
+			wantRole: "-",
+		},
+	}
+	for _, tt := range tests {
+		suite.T().Run(tt.name, func(t *testing.T) {
+			if len(tt.jwt_token_path) > 0 {
+				cfg.Client.JWTUserClaimPath = tt.jwt_token_path
+			}
+			if len(tt.jwt_role_path) > 0 {
+				cfg.Client.JWTRoleClaimPath = tt.jwt_role_path
+			}
+			gotUsr, gotRole := extractClaimsFromJWTHeader(tt.args.authorization)
+			assert.Equal(tt.wantUsr, gotUsr, "Unexpected user ID")
+			assert.Equal(tt.wantRole, gotRole, "Unexpected role")
+		})
+	}
+}