plot-api/src/jvmTest/kotlin/org/jetbrains/letsPlot/GGBunchThemeTest.kt [306:329]:
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        fun assertThemeSpec(
            figure: SubPlotsFigure,
            featureCount: Int,
            expected: Map<*, *>
        ) {
            assertThat(figure).features().length(featureCount)
            if (featureCount == 1) {
                val theme = assertThat(figure).features().get(0)
                val options = theme.isOptionsMap()
                    .kind(Option.Plot.THEME)
                    .options
                assertEquals(
                    expected,
                    options
                )
            }

            // test 'toSpec()'
            val spec = figure.toSpec()
            assertEquals(
                expected,
                spec[Option.Plot.THEME]
            )
        }
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plot-api/src/jvmTest/kotlin/org/jetbrains/letsPlot/GGGridThemeTest.kt [293:316]:
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        fun assertThemeSpec(
            figure: SubPlotsFigure,
            featureCount: Int,
            expected: Map<*, *>
        ) {
            assertThat(figure).features().length(featureCount)
            if (featureCount == 1) {
                val theme = assertThat(figure).features().get(0)
                val options = theme.isOptionsMap()
                    .kind(Option.Plot.THEME)
                    .options
                assertEquals(
                    expected,
                    options
                )
            }

            // test 'toSpec()'
            val spec = figure.toSpec()
            assertEquals(
                expected,
                spec[Option.Plot.THEME]
            )
        }
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