plot-stem/src/jvmTest/kotlin/org/jetbrains/letsPlot/core/spec/config/DataJoinTest.kt [415:461]:
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            .build()

        val jointDataFrame = ConfigUtil.join(data, listOf("Country"), map, listOf("request"))

        assertThat(jointDataFrame)
            .hasSerie(
                variable(data, "Country"), listOf(
                    "USA", "USA",
                    "FR", "FR",
                    null // GER
                )
            )
            .hasSerie(
                variable(data, "Category"), listOf(
                    "A", "B", // USA
                    "A", "B", // FR
                    null // GER
                )
            )
            .hasSerie(
                variable(data, "Value"), listOf(
                    0.0, 1.0, // USA
                    4.0, 5.0, // FR
                    null // GER
                )
            )
            .hasSerie(
                variable(map, "request"), listOf(
                    "USA", "USA",
                    "FR", "FR",
                    "GER"
                )
            )
            .hasSerie(
                variable(map, "found name"), listOf(
                    "United States of America", "United States of America",
                    "France", "France",
                    "Germany"
                )
            )
            .hasSerie(
                variable(map, "geometry"), listOf(
                    "usa_geometry", "usa_geometry",
                    "fr_geometry", "fr_geometry",
                    "ger_geometry"
                )
            )
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plot-stem/src/jvmTest/kotlin/org/jetbrains/letsPlot/core/spec/config/DataJoinTest.kt [548:594]:
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            .build()

        val jointDataFrame = ConfigUtil.join(data, listOf("Country"), map, listOf("request"))

        assertThat(jointDataFrame)
            .hasSerie(
                variable(data, "Country"), listOf(
                    "USA", "USA",
                    "FR", "FR",
                    null // GER
                )
            )
            .hasSerie(
                variable(data, "Category"), listOf(
                    "A", "B", // USA
                    "A", "B", // FR
                    null // GER
                )
            )
            .hasSerie(
                variable(data, "Value"), listOf(
                    0.0, 1.0, // USA
                    4.0, 5.0, // FR
                    null // GER
                )
            )
            .hasSerie(
                variable(map, "request"), listOf(
                    "USA", "USA",
                    "FR", "FR",
                    "GER"
                )
            )
            .hasSerie(
                variable(map, "found name"), listOf(
                    "United States of America", "United States of America",
                    "France", "France",
                    "Germany"
                )
            )
            .hasSerie(
                variable(map, "geometry"), listOf(
                    "usa_geometry", "usa_geometry",
                    "fr_geometry", "fr_geometry",
                    "ger_geometry"
                )
            )
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