Add tests for RUN.

Author: python-processing-unit

tests/cases/failing/run-arity-two.pre

@@ -0,0 +1 @@
+RUN("", "")

tests/cases/failing/run-arity-zero.pre

@@ -0,0 +1 @@
+RUN()

tests/cases/failing/run-non-str.pre

@@ -0,0 +1 @@
+RUN(0d1)

tests/cases/passing/run-empty-source.pre

@@ -0,0 +1,3 @@
+INT: marker = 0d1
+RUN("")
+ASSERT(EQ(marker, 0d1))

tests/cases/passing/run-parse-error.pre

@@ -0,0 +1,12 @@
+INT: step = 0d0
+BOOL: caught = FALSE
+
+TRY{
+    RUN("step = 0d1; IF(TRUE){")
+    ASSERT(FALSE)
+} CATCH {
+    caught = TRUE
+}
+
+ASSERT(caught)
+ASSERT(EQ(step, 0d0))

tests/cases/passing/run-runtime-error.pre

@@ -0,0 +1,12 @@
+INT: step = 0d0
+BOOL: caught = FALSE
+
+TRY{
+    RUN("step = 0d1; ASSERT(FALSE); step = 0d2")
+    ASSERT(FALSE)
+} CATCH {
+    caught = TRUE
+}
+
+ASSERT(caught)
+ASSERT(EQ(step, 0d1))

tests/cases/passing/run-top-level-env.pre

@@ -0,0 +1,7 @@
+INT: counter = 0d2
+
+RUN("ASSERT(EQ(counter, 0d2)); counter = ADD(counter, 0d3)")
+ASSERT(EQ(counter, 0d5))
+
+RUN("INT: created = SUB(counter, 0d1)")
+ASSERT(EQ(created, 0d4))