testing eval context builder

src/test/groovy/pl/allegro/tech/opel/EvalContextBuilderSpec.groovy

@@ -0,0 +1,46 @@
+package pl.allegro.tech.opel
+
+import spock.lang.Specification
+
+import static pl.allegro.tech.opel.EvalContextBuilder.create
+import static pl.allegro.tech.opel.TestUtil.constFunctionReturning
+
+class EvalContextBuilderSpec extends Specification {
+    def "should create merged context using elements from secondary context"() {
+        given:
+        def primary = create()
+                .withCompletedVariable('vv', 'value1')
+                .withFunction('ff', constFunctionReturning('from fun 1'))
+                .build()
+        def secondary = create()
+                .withCompletedVariable('v', 'value2')
+                .withFunction('f', constFunctionReturning('from fun 2'))
+                .build()
+
+        when:
+        def context = EvalContextBuilder.mergeContexts(primary, secondary)
+
+        then:
+        context.getVariable('v').get().get() == 'value2'
+        context.getFunction('f').get().apply([]).get() == 'from fun 2'
+    }
+
+    def "should create merged context using elements from primary context"() {
+        given:
+        def primary = create()
+                        .withCompletedVariable('v', 'value1')
+                        .withFunction('f', constFunctionReturning('from fun 1'))
+                        .build()
+        def secondary = create()
+                        .withCompletedVariable('v', 'value2')
+                        .withFunction('f', constFunctionReturning('from fun 2'))
+                        .build()
+
+        when:
+        def context = EvalContextBuilder.mergeContexts(primary, secondary)
+
+        then:
+        context.getVariable('v').get().get() == 'value1'
+        context.getFunction('f').get().apply([]).get() == 'from fun 1'
+    }
+}