[SPARK-10013][ML][JAVA][TEST] remove java assert from java unit tests

[holdenk]

From Jira: We should use assertTrue, etc. instead to make sure the asserts are not ignored in tests.

[holdenk]

cc @jkbradley as the source of the JIRA

[SparkQA]

Test build #42029 has finished for PR 8607 at commit b3777fb.

• This patch fails Spark unit tests.
• This patch merges cleanly.
• This patch adds no public classes.

[SparkQA]

Test build #42030 has finished for PR 8607 at commit 83544e0.

• This patch passes all tests.
• This patch merges cleanly.
• This patch adds the following public classes (experimental):
  • class DCT(JavaTransformer, HasInputCol, HasOutputCol):
  • class SQLTransformer(JavaTransformer):
  • class StopWordsRemover(JavaTransformer, HasInputCol, HasOutputCol):

[rxin]

what is this?

[holdenk]

oh fnur sorry, got mixed in, will take it out.

[rxin]

LGTM - except the build file.

[SparkQA]

Test build #42048 has finished for PR 8607 at commit 869b20d.

• This patch passes all tests.
• This patch merges cleanly.
• This patch adds no public classes.

[rxin]

I've merged this.

[srowen]

Post-hoc +1 -- this was another thing I wanted to fix about the Java suite tests.